mirror of https://github.com/grpc/grpc.git
Bogdan Drutu
9 years ago
commit
43f6311c58
21 changed files with 1654 additions and 0 deletions
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/*
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* |
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* Copyright 2015-2016, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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// Implements an efficient in-memory log, optimized for multiple writers and
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// a single reader. Available log space is divided up in blocks of
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// CENSUS_LOG_2_MAX_RECORD_SIZE bytes. A block can be in one of the following
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// three data structures:
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// - Free blocks (free_block_list)
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// - Blocks with unread data (dirty_block_list)
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// - Blocks currently attached to cores (core_local_blocks[])
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//
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// census_log_start_write() moves a block from core_local_blocks[] to the end of
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// dirty_block_list when block:
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// - is out-of-space OR
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// - has an incomplete record (an incomplete record occurs when a thread calls
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// census_log_start_write() and is context-switched before calling
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// census_log_end_write()
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// So, blocks in dirty_block_list are ordered, from oldest to newest, by the
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// time when block is detached from the core.
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//
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// census_log_read_next() first iterates over dirty_block_list and then
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// core_local_blocks[]. It moves completely read blocks from dirty_block_list
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// to free_block_list. Blocks in core_local_blocks[] are not freed, even when
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// completely read.
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//
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// If the log is configured to discard old records and free_block_list is empty,
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// census_log_start_write() iterates over dirty_block_list to allocate a
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// new block. It moves the oldest available block (no pending read/write) to
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// core_local_blocks[].
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//
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// core_local_block_struct is used to implement a map from core id to the block
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// associated with that core. This mapping is advisory. It is possible that the
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// block returned by this mapping is no longer associated with that core. This
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// mapping is updated, lazily, by census_log_start_write().
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//
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// Locking in block struct:
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//
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// Exclusive g_log.lock must be held before calling any functions operating on
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// block structs except census_log_start_write() and census_log_end_write().
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//
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// Writes to a block are serialized via writer_lock. census_log_start_write()
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// acquires this lock and census_log_end_write() releases it. On failure to
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// acquire the lock, writer allocates a new block for the current core and
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// updates core_local_block accordingly.
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//
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// Simultaneous read and write access is allowed. Readers can safely read up to
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// committed bytes (bytes_committed).
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//
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// reader_lock protects the block, currently being read, from getting recycled.
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// start_read() acquires reader_lock and end_read() releases the lock.
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//
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// Read/write access to a block is disabled via try_disable_access(). It returns
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// with both writer_lock and reader_lock held. These locks are subsequently
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// released by enable_access() to enable access to the block.
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//
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// A note on naming: Most function/struct names are prepended by cl_
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// (shorthand for census_log). Further, functions that manipulate structures
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// include the name of the structure, which will be passed as the first
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// argument. E.g. cl_block_initialize() will initialize a cl_block.
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#include "src/core/census/log.h" |
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#include <grpc/support/alloc.h> |
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#include <grpc/support/atm.h> |
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#include <grpc/support/cpu.h> |
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#include <grpc/support/log.h> |
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#include <grpc/support/sync.h> |
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#include <grpc/support/useful.h> |
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#include <stdbool.h> |
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#include <string.h> |
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// End of platform specific code
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typedef struct census_log_block_list_struct { |
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struct census_log_block_list_struct* next; |
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struct census_log_block_list_struct* prev; |
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struct census_log_block* block; |
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} cl_block_list_struct; |
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typedef struct census_log_block { |
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// Pointer to underlying buffer.
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char* buffer; |
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gpr_atm writer_lock; |
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gpr_atm reader_lock; |
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// Keeps completely written bytes. Declared atomic because accessed
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// simultaneously by reader and writer.
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gpr_atm bytes_committed; |
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// Bytes already read.
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size_t bytes_read; |
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// Links for list.
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cl_block_list_struct link; |
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// We want this structure to be cacheline aligned. We assume the following
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// sizes for the various parts on 32/64bit systems:
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// type 32b size 64b size
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// char* 4 8
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// 3x gpr_atm 12 24
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// size_t 4 8
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// cl_block_list_struct 12 24
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// TOTAL 32 64
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//
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// Depending on the size of our cacheline and the architecture, we
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// selectively add char buffering to this structure. The size is checked
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// via assert in census_log_initialize().
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#if defined(GPR_ARCH_64) |
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#define CL_BLOCK_PAD_SIZE (GPR_CACHELINE_SIZE - 64) |
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#else |
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#if defined(GPR_ARCH_32) |
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#define CL_BLOCK_PAD_SIZE (GPR_CACHELINE_SIZE - 32) |
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#else |
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#error "Unknown architecture" |
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#endif |
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#endif |
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#if CL_BLOCK_PAD_SIZE > 0 |
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char padding[CL_BLOCK_PAD_SIZE]; |
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#endif |
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} cl_block; |
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// A list of cl_blocks, doubly-linked through cl_block::link.
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typedef struct census_log_block_list { |
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int32_t count; // Number of items in list.
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cl_block_list_struct ht; // head/tail of linked list.
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} cl_block_list; |
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// Cacheline aligned block pointers to avoid false sharing. Block pointer must
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// be initialized via set_block(), before calling other functions
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typedef struct census_log_core_local_block { |
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gpr_atm block; |
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// Ensure cachline alignment: we assume sizeof(gpr_atm) == 4 or 8
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#if defined(GPR_ARCH_64) |
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#define CL_CORE_LOCAL_BLOCK_PAD_SIZE (GPR_CACHELINE_SIZE - 8) |
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#else |
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#if defined(GPR_ARCH_32) |
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#define CL_CORE_LOCAL_BLOCK_PAD_SIZE (GPR_CACHELINE_SIZE - 4) |
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#else |
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#error "Unknown architecture" |
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#endif |
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#endif |
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#if CL_CORE_LOCAL_BLOCK_PAD_SIZE > 0 |
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char padding[CL_CORE_LOCAL_BLOCK_PAD_SIZE]; |
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#endif |
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} cl_core_local_block; |
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struct census_log { |
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int discard_old_records; |
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// Number of cores (aka hardware-contexts)
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unsigned num_cores; |
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// number of CENSUS_LOG_2_MAX_RECORD_SIZE blocks in log
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uint32_t num_blocks; |
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cl_block* blocks; // Block metadata.
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cl_core_local_block* core_local_blocks; // Keeps core to block mappings.
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gpr_mu lock; |
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int initialized; // has log been initialized?
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// Keeps the state of the reader iterator. A value of 0 indicates that
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// iterator has reached the end. census_log_init_reader() resets the value
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// to num_core to restart iteration.
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uint32_t read_iterator_state; |
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// Points to the block being read. If non-NULL, the block is locked for
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// reading(block_being_read_->reader_lock is held).
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cl_block* block_being_read; |
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char* buffer; |
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cl_block_list free_block_list; |
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cl_block_list dirty_block_list; |
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gpr_atm out_of_space_count; |
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}; |
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// Single internal log.
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static struct census_log g_log; |
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// Functions that operate on an atomic memory location used as a lock.
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// Returns non-zero if lock is acquired.
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static int cl_try_lock(gpr_atm* lock) { return gpr_atm_acq_cas(lock, 0, 1); } |
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static void cl_unlock(gpr_atm* lock) { gpr_atm_rel_store(lock, 0); } |
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// Functions that operate on cl_core_local_block's.
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static void cl_core_local_block_set_block(cl_core_local_block* clb, |
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cl_block* block) { |
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gpr_atm_rel_store(&clb->block, (gpr_atm)block); |
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} |
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static cl_block* cl_core_local_block_get_block(cl_core_local_block* clb) { |
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return (cl_block*)gpr_atm_acq_load(&clb->block); |
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} |
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// Functions that operate on cl_block_list_struct's.
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static void cl_block_list_struct_initialize(cl_block_list_struct* bls, |
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cl_block* block) { |
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bls->next = bls->prev = bls; |
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bls->block = block; |
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} |
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// Functions that operate on cl_block_list's.
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static void cl_block_list_initialize(cl_block_list* list) { |
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list->count = 0; |
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cl_block_list_struct_initialize(&list->ht, NULL); |
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} |
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// Returns head of *this, or NULL if empty.
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static cl_block* cl_block_list_head(cl_block_list* list) { |
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return list->ht.next->block; |
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} |
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// Insert element *e after *pos.
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static void cl_block_list_insert(cl_block_list* list, cl_block_list_struct* pos, |
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cl_block_list_struct* e) { |
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list->count++; |
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e->next = pos->next; |
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e->prev = pos; |
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e->next->prev = e; |
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e->prev->next = e; |
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} |
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// Insert block at the head of the list
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static void cl_block_list_insert_at_head(cl_block_list* list, cl_block* block) { |
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cl_block_list_insert(list, &list->ht, &block->link); |
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} |
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// Insert block at the tail of the list.
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static void cl_block_list_insert_at_tail(cl_block_list* list, cl_block* block) { |
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cl_block_list_insert(list, list->ht.prev, &block->link); |
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} |
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// Removes block *b. Requires *b be in the list.
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static void cl_block_list_remove(cl_block_list* list, cl_block* b) { |
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list->count--; |
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b->link.next->prev = b->link.prev; |
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b->link.prev->next = b->link.next; |
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} |
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// Functions that operate on cl_block's
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static void cl_block_initialize(cl_block* block, char* buffer) { |
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block->buffer = buffer; |
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gpr_atm_rel_store(&block->writer_lock, 0); |
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gpr_atm_rel_store(&block->reader_lock, 0); |
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gpr_atm_rel_store(&block->bytes_committed, 0); |
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block->bytes_read = 0; |
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cl_block_list_struct_initialize(&block->link, block); |
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} |
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// Guards against exposing partially written buffer to the reader.
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static void cl_block_set_bytes_committed(cl_block* block, |
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size_t bytes_committed) { |
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gpr_atm_rel_store(&block->bytes_committed, (gpr_atm)bytes_committed); |
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} |
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static size_t cl_block_get_bytes_committed(cl_block* block) { |
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return (size_t)gpr_atm_acq_load(&block->bytes_committed); |
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} |
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// Tries to disable future read/write access to this block. Succeeds if:
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// - no in-progress write AND
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// - no in-progress read AND
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// - 'discard_data' set to true OR no unread data
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// On success, clears the block state and returns with writer_lock_ and
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// reader_lock_ held. These locks are released by a subsequent
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// cl_block_access_enable() call.
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static bool cl_block_try_disable_access(cl_block* block, int discard_data) { |
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if (!cl_try_lock(&block->writer_lock)) { |
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return false; |
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} |
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if (!cl_try_lock(&block->reader_lock)) { |
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cl_unlock(&block->writer_lock); |
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return false; |
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} |
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if (!discard_data && |
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(block->bytes_read != cl_block_get_bytes_committed(block))) { |
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cl_unlock(&block->reader_lock); |
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cl_unlock(&block->writer_lock); |
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return false; |
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} |
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cl_block_set_bytes_committed(block, 0); |
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block->bytes_read = 0; |
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return true; |
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} |
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static void cl_block_enable_access(cl_block* block) { |
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cl_unlock(&block->reader_lock); |
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cl_unlock(&block->writer_lock); |
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} |
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// Returns with writer_lock held.
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static void* cl_block_start_write(cl_block* block, size_t size) { |
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if (!cl_try_lock(&block->writer_lock)) { |
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return NULL; |
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} |
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size_t bytes_committed = cl_block_get_bytes_committed(block); |
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if (bytes_committed + size > CENSUS_LOG_MAX_RECORD_SIZE) { |
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cl_unlock(&block->writer_lock); |
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return NULL; |
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} |
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return block->buffer + bytes_committed; |
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} |
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// Releases writer_lock and increments committed bytes by 'bytes_written'.
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// 'bytes_written' must be <= 'size' specified in the corresponding
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// StartWrite() call. This function is thread-safe.
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static void cl_block_end_write(cl_block* block, size_t bytes_written) { |
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cl_block_set_bytes_committed( |
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block, cl_block_get_bytes_committed(block) + bytes_written); |
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cl_unlock(&block->writer_lock); |
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} |
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// Returns a pointer to the first unread byte in buffer. The number of bytes
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// available are returned in 'bytes_available'. Acquires reader lock that is
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// released by a subsequent cl_block_end_read() call. Returns NULL if:
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// - read in progress
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// - no data available
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static void* cl_block_start_read(cl_block* block, size_t* bytes_available) { |
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if (!cl_try_lock(&block->reader_lock)) { |
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return NULL; |
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} |
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// bytes_committed may change from under us. Use bytes_available to update
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// bytes_read below.
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size_t bytes_committed = cl_block_get_bytes_committed(block); |
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GPR_ASSERT(bytes_committed >= block->bytes_read); |
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*bytes_available = bytes_committed - block->bytes_read; |
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if (*bytes_available == 0) { |
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cl_unlock(&block->reader_lock); |
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return NULL; |
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} |
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void* record = block->buffer + block->bytes_read; |
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block->bytes_read += *bytes_available; |
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return record; |
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} |
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static void cl_block_end_read(cl_block* block) { |
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cl_unlock(&block->reader_lock); |
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} |
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// Internal functions operating on g_log
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// Allocates a new free block (or recycles an available dirty block if log is
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// configured to discard old records). Returns NULL if out-of-space.
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static cl_block* cl_allocate_block(void) { |
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cl_block* block = cl_block_list_head(&g_log.free_block_list); |
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if (block != NULL) { |
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cl_block_list_remove(&g_log.free_block_list, block); |
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return block; |
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} |
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if (!g_log.discard_old_records) { |
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// No free block and log is configured to keep old records.
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return NULL; |
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} |
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// Recycle dirty block. Start from the oldest.
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for (block = cl_block_list_head(&g_log.dirty_block_list); block != NULL; |
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block = block->link.next->block) { |
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if (cl_block_try_disable_access(block, 1 /* discard data */)) { |
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cl_block_list_remove(&g_log.dirty_block_list, block); |
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return block; |
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} |
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} |
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return NULL; |
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} |
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// Allocates a new block and updates core id => block mapping. 'old_block'
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// points to the block that the caller thinks is attached to
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// 'core_id'. 'old_block' may be NULL. Returns true if:
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// - allocated a new block OR
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// - 'core_id' => 'old_block' mapping changed (another thread allocated a
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// block before lock was acquired).
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static bool cl_allocate_core_local_block(uint32_t core_id, |
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cl_block* old_block) { |
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// Now that we have the lock, check if core-local mapping has changed.
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cl_core_local_block* core_local_block = &g_log.core_local_blocks[core_id]; |
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cl_block* block = cl_core_local_block_get_block(core_local_block); |
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if ((block != NULL) && (block != old_block)) { |
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return true; |
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} |
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if (block != NULL) { |
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cl_core_local_block_set_block(core_local_block, NULL); |
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cl_block_list_insert_at_tail(&g_log.dirty_block_list, block); |
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} |
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block = cl_allocate_block(); |
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if (block == NULL) { |
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return false; |
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} |
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cl_core_local_block_set_block(core_local_block, block); |
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cl_block_enable_access(block); |
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return true; |
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} |
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static cl_block* cl_get_block(void* record) { |
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uintptr_t p = (uintptr_t)((char*)record - g_log.buffer); |
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uintptr_t index = p >> CENSUS_LOG_2_MAX_RECORD_SIZE; |
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return &g_log.blocks[index]; |
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} |
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// Gets the next block to read and tries to free 'prev' block (if not NULL).
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// Returns NULL if reached the end.
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static cl_block* cl_next_block_to_read(cl_block* prev) { |
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cl_block* block = NULL; |
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if (g_log.read_iterator_state == g_log.num_cores) { |
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// We are traversing dirty list; find the next dirty block.
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if (prev != NULL) { |
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// Try to free the previous block if there is no unread data. This
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// block
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// may have unread data if previously incomplete record completed
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// between
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// read_next() calls.
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block = prev->link.next->block; |
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if (cl_block_try_disable_access(prev, 0 /* do not discard data */)) { |
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cl_block_list_remove(&g_log.dirty_block_list, prev); |
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cl_block_list_insert_at_head(&g_log.free_block_list, prev); |
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} |
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} else { |
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block = cl_block_list_head(&g_log.dirty_block_list); |
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} |
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if (block != NULL) { |
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return block; |
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} |
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// We are done with the dirty list; moving on to core-local blocks.
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} |
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while (g_log.read_iterator_state > 0) { |
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g_log.read_iterator_state--; |
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block = cl_core_local_block_get_block( |
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&g_log.core_local_blocks[g_log.read_iterator_state]); |
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if (block != NULL) { |
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return block; |
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} |
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} |
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return NULL; |
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} |
||||
|
||||
#define CL_LOG_2_MB 20 // 2^20 = 1MB
|
||||
|
||||
// External functions: primary stats_log interface
|
||||
void census_log_initialize(size_t size_in_mb, int discard_old_records) { |
||||
// Check cacheline alignment.
|
||||
GPR_ASSERT(sizeof(cl_block) % GPR_CACHELINE_SIZE == 0); |
||||
GPR_ASSERT(sizeof(cl_core_local_block) % GPR_CACHELINE_SIZE == 0); |
||||
GPR_ASSERT(!g_log.initialized); |
||||
g_log.discard_old_records = discard_old_records; |
||||
g_log.num_cores = gpr_cpu_num_cores(); |
||||
// Ensure that we will not get any overflow in calaculating num_blocks
|
||||
GPR_ASSERT(CL_LOG_2_MB >= CENSUS_LOG_2_MAX_RECORD_SIZE); |
||||
GPR_ASSERT(size_in_mb < 1000); |
||||
// Ensure at least 2x as many blocks as there are cores.
|
||||
g_log.num_blocks = |
||||
(uint32_t)GPR_MAX(2 * g_log.num_cores, (size_in_mb << CL_LOG_2_MB) >> |
||||
CENSUS_LOG_2_MAX_RECORD_SIZE); |
||||
gpr_mu_init(&g_log.lock); |
||||
g_log.read_iterator_state = 0; |
||||
g_log.block_being_read = NULL; |
||||
g_log.core_local_blocks = (cl_core_local_block*)gpr_malloc_aligned( |
||||
g_log.num_cores * sizeof(cl_core_local_block), GPR_CACHELINE_SIZE_LOG); |
||||
memset(g_log.core_local_blocks, 0, |
||||
g_log.num_cores * sizeof(cl_core_local_block)); |
||||
g_log.blocks = (cl_block*)gpr_malloc_aligned( |
||||
g_log.num_blocks * sizeof(cl_block), GPR_CACHELINE_SIZE_LOG); |
||||
memset(g_log.blocks, 0, g_log.num_blocks * sizeof(cl_block)); |
||||
g_log.buffer = gpr_malloc(g_log.num_blocks * CENSUS_LOG_MAX_RECORD_SIZE); |
||||
memset(g_log.buffer, 0, g_log.num_blocks * CENSUS_LOG_MAX_RECORD_SIZE); |
||||
cl_block_list_initialize(&g_log.free_block_list); |
||||
cl_block_list_initialize(&g_log.dirty_block_list); |
||||
for (uint32_t i = 0; i < g_log.num_blocks; ++i) { |
||||
cl_block* block = g_log.blocks + i; |
||||
cl_block_initialize(block, g_log.buffer + (CENSUS_LOG_MAX_RECORD_SIZE * i)); |
||||
cl_block_try_disable_access(block, 1 /* discard data */); |
||||
cl_block_list_insert_at_tail(&g_log.free_block_list, block); |
||||
} |
||||
gpr_atm_rel_store(&g_log.out_of_space_count, 0); |
||||
g_log.initialized = 1; |
||||
} |
||||
|
||||
void census_log_shutdown(void) { |
||||
GPR_ASSERT(g_log.initialized); |
||||
gpr_mu_destroy(&g_log.lock); |
||||
gpr_free_aligned(g_log.core_local_blocks); |
||||
g_log.core_local_blocks = NULL; |
||||
gpr_free_aligned(g_log.blocks); |
||||
g_log.blocks = NULL; |
||||
gpr_free(g_log.buffer); |
||||
g_log.buffer = NULL; |
||||
g_log.initialized = 0; |
||||
} |
||||
|
||||
void* census_log_start_write(size_t size) { |
||||
// Used to bound number of times block allocation is attempted.
|
||||
GPR_ASSERT(size > 0); |
||||
GPR_ASSERT(g_log.initialized); |
||||
if (size > CENSUS_LOG_MAX_RECORD_SIZE) { |
||||
return NULL; |
||||
} |
||||
uint32_t attempts_remaining = g_log.num_blocks; |
||||
uint32_t core_id = gpr_cpu_current_cpu(); |
||||
do { |
||||
void* record = NULL; |
||||
cl_block* block = |
||||
cl_core_local_block_get_block(&g_log.core_local_blocks[core_id]); |
||||
if (block && (record = cl_block_start_write(block, size))) { |
||||
return record; |
||||
} |
||||
// Need to allocate a new block. We are here if:
|
||||
// - No block associated with the core OR
|
||||
// - Write in-progress on the block OR
|
||||
// - block is out of space
|
||||
gpr_mu_lock(&g_log.lock); |
||||
bool allocated = cl_allocate_core_local_block(core_id, block); |
||||
gpr_mu_unlock(&g_log.lock); |
||||
if (!allocated) { |
||||
gpr_atm_no_barrier_fetch_add(&g_log.out_of_space_count, 1); |
||||
return NULL; |
||||
} |
||||
} while (attempts_remaining--); |
||||
// Give up.
|
||||
gpr_atm_no_barrier_fetch_add(&g_log.out_of_space_count, 1); |
||||
return NULL; |
||||
} |
||||
|
||||
void census_log_end_write(void* record, size_t bytes_written) { |
||||
GPR_ASSERT(g_log.initialized); |
||||
cl_block_end_write(cl_get_block(record), bytes_written); |
||||
} |
||||
|
||||
void census_log_init_reader(void) { |
||||
GPR_ASSERT(g_log.initialized); |
||||
gpr_mu_lock(&g_log.lock); |
||||
// If a block is locked for reading unlock it.
|
||||
if (g_log.block_being_read != NULL) { |
||||
cl_block_end_read(g_log.block_being_read); |
||||
g_log.block_being_read = NULL; |
||||
} |
||||
g_log.read_iterator_state = g_log.num_cores; |
||||
gpr_mu_unlock(&g_log.lock); |
||||
} |
||||
|
||||
const void* census_log_read_next(size_t* bytes_available) { |
||||
GPR_ASSERT(g_log.initialized); |
||||
gpr_mu_lock(&g_log.lock); |
||||
if (g_log.block_being_read != NULL) { |
||||
cl_block_end_read(g_log.block_being_read); |
||||
} |
||||
do { |
||||
g_log.block_being_read = cl_next_block_to_read(g_log.block_being_read); |
||||
if (g_log.block_being_read != NULL) { |
||||
void* record = |
||||
cl_block_start_read(g_log.block_being_read, bytes_available); |
||||
if (record != NULL) { |
||||
gpr_mu_unlock(&g_log.lock); |
||||
return record; |
||||
} |
||||
} |
||||
} while (g_log.block_being_read != NULL); |
||||
gpr_mu_unlock(&g_log.lock); |
||||
return NULL; |
||||
} |
||||
|
||||
size_t census_log_remaining_space(void) { |
||||
GPR_ASSERT(g_log.initialized); |
||||
size_t space = 0; |
||||
gpr_mu_lock(&g_log.lock); |
||||
if (g_log.discard_old_records) { |
||||
// Remaining space is not meaningful; just return the entire log space.
|
||||
space = g_log.num_blocks << CENSUS_LOG_2_MAX_RECORD_SIZE; |
||||
} else { |
||||
GPR_ASSERT(g_log.free_block_list.count >= 0); |
||||
space = (size_t)g_log.free_block_list.count * CENSUS_LOG_MAX_RECORD_SIZE; |
||||
} |
||||
gpr_mu_unlock(&g_log.lock); |
||||
return space; |
||||
} |
||||
|
||||
int64_t census_log_out_of_space_count(void) { |
||||
GPR_ASSERT(g_log.initialized); |
||||
return gpr_atm_acq_load(&g_log.out_of_space_count); |
||||
} |
||||
@ -0,0 +1,93 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015-2016, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
#ifndef GRPC_INTERNAL_CORE_CENSUS_LOG_H |
||||
#define GRPC_INTERNAL_CORE_CENSUS_LOG_H |
||||
|
||||
#include <grpc/support/port_platform.h> |
||||
#include <stddef.h> |
||||
|
||||
/* Maximum record size, in bytes. */ |
||||
#define CENSUS_LOG_2_MAX_RECORD_SIZE 14 /* 2^14 = 16KB */ |
||||
#define CENSUS_LOG_MAX_RECORD_SIZE (1 << CENSUS_LOG_2_MAX_RECORD_SIZE) |
||||
|
||||
/* Initialize the statistics logging subsystem with the given log size. A log
|
||||
size of 0 will result in the smallest possible log for the platform |
||||
(approximately CENSUS_LOG_MAX_RECORD_SIZE * gpr_cpu_num_cores()). If |
||||
discard_old_records is non-zero, then new records will displace older ones |
||||
when the log is full. This function must be called before any other |
||||
census_log functions. |
||||
*/ |
||||
void census_log_initialize(size_t size_in_mb, int discard_old_records); |
||||
|
||||
/* Shutdown the logging subsystem. Caller must ensure that:
|
||||
- no in progress or future call to any census_log functions |
||||
- no incomplete records |
||||
*/ |
||||
void census_log_shutdown(void); |
||||
|
||||
/* Allocates and returns a 'size' bytes record and marks it in use. A
|
||||
subsequent census_log_end_write() marks the record complete. The |
||||
'bytes_written' census_log_end_write() argument must be <= |
||||
'size'. Returns NULL if out-of-space AND: |
||||
- log is configured to keep old records OR |
||||
- all blocks are pinned by incomplete records. |
||||
*/ |
||||
void* census_log_start_write(size_t size); |
||||
|
||||
void census_log_end_write(void* record, size_t bytes_written); |
||||
|
||||
void census_log_init_reader(void); |
||||
|
||||
/* census_log_read_next() iterates over blocks with data and for each block
|
||||
returns a pointer to the first unread byte. The number of bytes that can be |
||||
read are returned in 'bytes_available'. Reader is expected to read all |
||||
available data. Reading the data consumes it i.e. it cannot be read again. |
||||
census_log_read_next() returns NULL if the end is reached i.e last block |
||||
is read. census_log_init_reader() starts the iteration or aborts the |
||||
current iteration. |
||||
*/ |
||||
const void* census_log_read_next(size_t* bytes_available); |
||||
|
||||
/* Returns estimated remaining space across all blocks, in bytes. If log is
|
||||
configured to discard old records, returns total log space. Otherwise, |
||||
returns space available in empty blocks (partially filled blocks are |
||||
treated as full). |
||||
*/ |
||||
size_t census_log_remaining_space(void); |
||||
|
||||
/* Returns the number of times gprc_stats_log_start_write() failed due to
|
||||
out-of-space. */ |
||||
int64_t census_log_out_of_space_count(void); |
||||
|
||||
#endif /* GRPC_INTERNAL_CORE_CENSUS_LOG_H */ |
||||
@ -0,0 +1,589 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015-2016, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
#include "src/core/census/log.h" |
||||
#include <grpc/support/cpu.h> |
||||
#include <grpc/support/log.h> |
||||
#include <grpc/support/port_platform.h> |
||||
#include <grpc/support/sync.h> |
||||
#include <grpc/support/thd.h> |
||||
#include <grpc/support/time.h> |
||||
#include <grpc/support/useful.h> |
||||
#include <stdio.h> |
||||
#include <stdlib.h> |
||||
#include <string.h> |
||||
#include "test/core/util/test_config.h" |
||||
|
||||
// Change this to non-zero if you want more output.
|
||||
#define VERBOSE 0 |
||||
|
||||
// Log size to use for all tests.
|
||||
#define LOG_SIZE_IN_MB 1 |
||||
#define LOG_SIZE_IN_BYTES (LOG_SIZE_IN_MB << 20) |
||||
|
||||
// Fills in 'record' of size 'size'. Each byte in record is filled in with the
|
||||
// same value. The value is extracted from 'record' pointer.
|
||||
static void write_record(char* record, size_t size) { |
||||
char data = (char)((uintptr_t)record % 255); |
||||
memset(record, data, size); |
||||
} |
||||
|
||||
// Reads fixed size records. Returns the number of records read in
|
||||
// 'num_records'.
|
||||
static void read_records(size_t record_size, const char* buffer, |
||||
size_t buffer_size, int* num_records) { |
||||
GPR_ASSERT(buffer_size >= record_size); |
||||
GPR_ASSERT(buffer_size % record_size == 0); |
||||
*num_records = (int)(buffer_size / record_size); |
||||
for (int i = 0; i < *num_records; ++i) { |
||||
const char* record = buffer + (record_size * (size_t)i); |
||||
char data = (char)((uintptr_t)record % 255); |
||||
for (size_t j = 0; j < record_size; ++j) { |
||||
GPR_ASSERT(data == record[j]); |
||||
} |
||||
} |
||||
} |
||||
|
||||
// Tries to write the specified number of records. Stops when the log gets
|
||||
// full. Returns the number of records written. Spins for random
|
||||
// number of times, up to 'max_spin_count', between writes.
|
||||
static int write_records_to_log(int writer_id, size_t record_size, |
||||
int num_records, int max_spin_count) { |
||||
int counter = 0; |
||||
for (int i = 0; i < num_records; ++i) { |
||||
int spin_count = max_spin_count ? rand() % max_spin_count : 0; |
||||
if (VERBOSE && (counter++ == num_records / 10)) { |
||||
printf(" Writer %d: %d out of %d written\n", writer_id, i, num_records); |
||||
counter = 0; |
||||
} |
||||
char* record = (char*)(census_log_start_write(record_size)); |
||||
if (record == NULL) { |
||||
return i; |
||||
} |
||||
write_record(record, record_size); |
||||
census_log_end_write(record, record_size); |
||||
for (int j = 0; j < spin_count; ++j) { |
||||
GPR_ASSERT(j >= 0); |
||||
} |
||||
} |
||||
return num_records; |
||||
} |
||||
|
||||
// Performs a single read iteration. Returns the number of records read.
|
||||
static int perform_read_iteration(size_t record_size) { |
||||
const void* read_buffer = NULL; |
||||
size_t bytes_available; |
||||
int records_read = 0; |
||||
census_log_init_reader(); |
||||
while ((read_buffer = census_log_read_next(&bytes_available))) { |
||||
int num_records = 0; |
||||
read_records(record_size, (const char*)read_buffer, bytes_available, |
||||
&num_records); |
||||
records_read += num_records; |
||||
} |
||||
return records_read; |
||||
} |
||||
|
||||
// Asserts that the log is empty.
|
||||
static void assert_log_empty(void) { |
||||
census_log_init_reader(); |
||||
size_t bytes_available; |
||||
GPR_ASSERT(census_log_read_next(&bytes_available) == NULL); |
||||
} |
||||
|
||||
// Fills the log and verifies data. If 'no fragmentation' is true, records
|
||||
// are sized such that CENSUS_LOG_2_MAX_RECORD_SIZE is a multiple of record
|
||||
// size. If not a circular log, verifies that the number of records written
|
||||
// match the number of records read.
|
||||
static void fill_log(size_t log_size, int no_fragmentation, int circular_log) { |
||||
size_t size; |
||||
if (no_fragmentation) { |
||||
int log2size = rand() % (CENSUS_LOG_2_MAX_RECORD_SIZE + 1); |
||||
size = ((size_t)1 << log2size); |
||||
} else { |
||||
while (1) { |
||||
size = 1 + ((size_t)rand() % CENSUS_LOG_MAX_RECORD_SIZE); |
||||
if (CENSUS_LOG_MAX_RECORD_SIZE % size) { |
||||
break; |
||||
} |
||||
} |
||||
} |
||||
int records_written = |
||||
write_records_to_log(0 /* writer id */, size, |
||||
(int)((log_size / size) * 2), 0 /* spin count */); |
||||
int records_read = perform_read_iteration(size); |
||||
if (!circular_log) { |
||||
GPR_ASSERT(records_written == records_read); |
||||
} |
||||
assert_log_empty(); |
||||
} |
||||
|
||||
// Structure to pass args to writer_thread
|
||||
typedef struct writer_thread_args { |
||||
// Index of this thread in the writers vector.
|
||||
int index; |
||||
// Record size.
|
||||
size_t record_size; |
||||
// Number of records to write.
|
||||
int num_records; |
||||
// Used to signal when writer is complete
|
||||
gpr_cv* done; |
||||
gpr_mu* mu; |
||||
int* count; |
||||
} writer_thread_args; |
||||
|
||||
// Writes the given number of records of random size (up to kMaxRecordSize) and
|
||||
// random data to the specified log.
|
||||
static void writer_thread(void* arg) { |
||||
writer_thread_args* args = (writer_thread_args*)arg; |
||||
// Maximum number of times to spin between writes.
|
||||
static const int MAX_SPIN_COUNT = 50; |
||||
int records_written = 0; |
||||
if (VERBOSE) { |
||||
printf(" Writer %d starting\n", args->index); |
||||
} |
||||
while (records_written < args->num_records) { |
||||
records_written += write_records_to_log(args->index, args->record_size, |
||||
args->num_records - records_written, |
||||
MAX_SPIN_COUNT); |
||||
if (records_written < args->num_records) { |
||||
// Ran out of log space. Sleep for a bit and let the reader catch up.
|
||||
// This should never happen for circular logs.
|
||||
if (VERBOSE) { |
||||
printf( |
||||
" Writer %d stalled due to out-of-space: %d out of %d " |
||||
"written\n", |
||||
args->index, records_written, args->num_records); |
||||
} |
||||
gpr_sleep_until(GRPC_TIMEOUT_MILLIS_TO_DEADLINE(10)); |
||||
} |
||||
} |
||||
// Done. Decrement count and signal.
|
||||
gpr_mu_lock(args->mu); |
||||
(*args->count)--; |
||||
gpr_cv_signal(args->done); |
||||
if (VERBOSE) { |
||||
printf(" Writer %d done\n", args->index); |
||||
} |
||||
gpr_mu_unlock(args->mu); |
||||
} |
||||
|
||||
// struct to pass args to reader_thread
|
||||
typedef struct reader_thread_args { |
||||
// Record size.
|
||||
size_t record_size; |
||||
// Interval between read iterations.
|
||||
int read_iteration_interval_in_msec; |
||||
// Total number of records.
|
||||
int total_records; |
||||
// Signalled when reader should stop.
|
||||
gpr_cv stop; |
||||
int stop_flag; |
||||
// Used to signal when reader has finished
|
||||
gpr_cv* done; |
||||
gpr_mu* mu; |
||||
int running; |
||||
} reader_thread_args; |
||||
|
||||
// Reads and verifies the specified number of records. Reader can also be
|
||||
// stopped via gpr_cv_signal(&args->stop). Sleeps for 'read_interval_in_msec'
|
||||
// between read iterations.
|
||||
static void reader_thread(void* arg) { |
||||
reader_thread_args* args = (reader_thread_args*)arg; |
||||
if (VERBOSE) { |
||||
printf(" Reader starting\n"); |
||||
} |
||||
gpr_timespec interval = gpr_time_from_micros( |
||||
args->read_iteration_interval_in_msec * 1000, GPR_TIMESPAN); |
||||
gpr_mu_lock(args->mu); |
||||
int records_read = 0; |
||||
int num_iterations = 0; |
||||
int counter = 0; |
||||
while (!args->stop_flag && records_read < args->total_records) { |
||||
gpr_cv_wait(&args->stop, args->mu, interval); |
||||
if (!args->stop_flag) { |
||||
records_read += perform_read_iteration(args->record_size); |
||||
GPR_ASSERT(records_read <= args->total_records); |
||||
if (VERBOSE && (counter++ == 100000)) { |
||||
printf(" Reader: %d out of %d read\n", records_read, |
||||
args->total_records); |
||||
counter = 0; |
||||
} |
||||
++num_iterations; |
||||
} |
||||
} |
||||
// Done
|
||||
args->running = 0; |
||||
gpr_cv_signal(args->done); |
||||
if (VERBOSE) { |
||||
printf(" Reader: records: %d, iterations: %d\n", records_read, |
||||
num_iterations); |
||||
} |
||||
gpr_mu_unlock(args->mu); |
||||
} |
||||
|
||||
// Creates NUM_WRITERS writers where each writer writes NUM_RECORDS_PER_WRITER
|
||||
// records. Also, starts a reader that iterates over and reads blocks every
|
||||
// READ_ITERATION_INTERVAL_IN_MSEC.
|
||||
// Number of writers.
|
||||
#define NUM_WRITERS 5 |
||||
static void multiple_writers_single_reader(int circular_log) { |
||||
// Sleep interval between read iterations.
|
||||
static const int READ_ITERATION_INTERVAL_IN_MSEC = 10; |
||||
// Maximum record size.
|
||||
static const size_t MAX_RECORD_SIZE = 20; |
||||
// Number of records written by each writer. This is sized such that we
|
||||
// will write through the entire log ~10 times.
|
||||
const int NUM_RECORDS_PER_WRITER = |
||||
(int)((10 * census_log_remaining_space()) / (MAX_RECORD_SIZE / 2)) / |
||||
NUM_WRITERS; |
||||
size_t record_size = ((size_t)rand() % MAX_RECORD_SIZE) + 1; |
||||
// Create and start writers.
|
||||
writer_thread_args writers[NUM_WRITERS]; |
||||
int writers_count = NUM_WRITERS; |
||||
gpr_cv writers_done; |
||||
gpr_mu writers_mu; // protects writers_done and writers_count
|
||||
gpr_cv_init(&writers_done); |
||||
gpr_mu_init(&writers_mu); |
||||
gpr_thd_id id; |
||||
for (int i = 0; i < NUM_WRITERS; ++i) { |
||||
writers[i].index = i; |
||||
writers[i].record_size = record_size; |
||||
writers[i].num_records = NUM_RECORDS_PER_WRITER; |
||||
writers[i].done = &writers_done; |
||||
writers[i].count = &writers_count; |
||||
writers[i].mu = &writers_mu; |
||||
gpr_thd_new(&id, &writer_thread, &writers[i], NULL); |
||||
} |
||||
// Start reader.
|
||||
gpr_cv reader_done; |
||||
gpr_mu reader_mu; // protects reader_done and reader.running
|
||||
reader_thread_args reader; |
||||
reader.record_size = record_size; |
||||
reader.read_iteration_interval_in_msec = READ_ITERATION_INTERVAL_IN_MSEC; |
||||
reader.total_records = NUM_WRITERS * NUM_RECORDS_PER_WRITER; |
||||
reader.stop_flag = 0; |
||||
gpr_cv_init(&reader.stop); |
||||
gpr_cv_init(&reader_done); |
||||
reader.done = &reader_done; |
||||
gpr_mu_init(&reader_mu); |
||||
reader.mu = &reader_mu; |
||||
reader.running = 1; |
||||
gpr_thd_new(&id, &reader_thread, &reader, NULL); |
||||
// Wait for writers to finish.
|
||||
gpr_mu_lock(&writers_mu); |
||||
while (writers_count != 0) { |
||||
gpr_cv_wait(&writers_done, &writers_mu, gpr_inf_future(GPR_CLOCK_REALTIME)); |
||||
} |
||||
gpr_mu_unlock(&writers_mu); |
||||
gpr_mu_destroy(&writers_mu); |
||||
gpr_cv_destroy(&writers_done); |
||||
gpr_mu_lock(&reader_mu); |
||||
if (circular_log) { |
||||
// Stop reader.
|
||||
reader.stop_flag = 1; |
||||
gpr_cv_signal(&reader.stop); |
||||
} |
||||
// wait for reader to finish
|
||||
while (reader.running) { |
||||
gpr_cv_wait(&reader_done, &reader_mu, gpr_inf_future(GPR_CLOCK_REALTIME)); |
||||
} |
||||
if (circular_log) { |
||||
// Assert that there were no out-of-space errors.
|
||||
GPR_ASSERT(0 == census_log_out_of_space_count()); |
||||
} |
||||
gpr_mu_unlock(&reader_mu); |
||||
gpr_mu_destroy(&reader_mu); |
||||
gpr_cv_destroy(&reader_done); |
||||
if (VERBOSE) { |
||||
printf(" Reader: finished\n"); |
||||
} |
||||
} |
||||
|
||||
static void setup_test(int circular_log) { |
||||
census_log_initialize(LOG_SIZE_IN_MB, circular_log); |
||||
GPR_ASSERT(census_log_remaining_space() == LOG_SIZE_IN_BYTES); |
||||
} |
||||
|
||||
// Attempts to create a record of invalid size (size >
|
||||
// CENSUS_LOG_MAX_RECORD_SIZE).
|
||||
void test_invalid_record_size(void) { |
||||
static const size_t INVALID_SIZE = CENSUS_LOG_MAX_RECORD_SIZE + 1; |
||||
static const size_t VALID_SIZE = 1; |
||||
printf("Starting test: invalid record size\n"); |
||||
setup_test(0); |
||||
void* record = census_log_start_write(INVALID_SIZE); |
||||
GPR_ASSERT(record == NULL); |
||||
// Now try writing a valid record.
|
||||
record = census_log_start_write(VALID_SIZE); |
||||
GPR_ASSERT(record != NULL); |
||||
census_log_end_write(record, VALID_SIZE); |
||||
// Verifies that available space went down by one block. In theory, this
|
||||
// check can fail if the thread is context switched to a new CPU during the
|
||||
// start_write execution (multiple blocks get allocated), but this has not
|
||||
// been observed in practice.
|
||||
GPR_ASSERT(LOG_SIZE_IN_BYTES - CENSUS_LOG_MAX_RECORD_SIZE == |
||||
census_log_remaining_space()); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Tests end_write() with a different size than what was specified in
|
||||
// start_write().
|
||||
void test_end_write_with_different_size(void) { |
||||
static const size_t START_WRITE_SIZE = 10; |
||||
static const size_t END_WRITE_SIZE = 7; |
||||
printf("Starting test: end write with different size\n"); |
||||
setup_test(0); |
||||
void* record_written = census_log_start_write(START_WRITE_SIZE); |
||||
GPR_ASSERT(record_written != NULL); |
||||
census_log_end_write(record_written, END_WRITE_SIZE); |
||||
census_log_init_reader(); |
||||
size_t bytes_available; |
||||
const void* record_read = census_log_read_next(&bytes_available); |
||||
GPR_ASSERT(record_written == record_read); |
||||
GPR_ASSERT(END_WRITE_SIZE == bytes_available); |
||||
assert_log_empty(); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Verifies that pending records are not available via read_next().
|
||||
void test_read_pending_record(void) { |
||||
static const size_t PR_RECORD_SIZE = 1024; |
||||
printf("Starting test: read pending record\n"); |
||||
setup_test(0); |
||||
// Start a write.
|
||||
void* record_written = census_log_start_write(PR_RECORD_SIZE); |
||||
GPR_ASSERT(record_written != NULL); |
||||
// As write is pending, read should fail.
|
||||
census_log_init_reader(); |
||||
size_t bytes_available; |
||||
const void* record_read = census_log_read_next(&bytes_available); |
||||
GPR_ASSERT(record_read == NULL); |
||||
// A read followed by end_write() should succeed.
|
||||
census_log_end_write(record_written, PR_RECORD_SIZE); |
||||
census_log_init_reader(); |
||||
record_read = census_log_read_next(&bytes_available); |
||||
GPR_ASSERT(record_written == record_read); |
||||
GPR_ASSERT(PR_RECORD_SIZE == bytes_available); |
||||
assert_log_empty(); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Tries reading beyond pending write.
|
||||
void test_read_beyond_pending_record(void) { |
||||
printf("Starting test: read beyond pending record\n"); |
||||
setup_test(0); |
||||
// Start a write.
|
||||
const size_t incomplete_record_size = 10; |
||||
void* incomplete_record = census_log_start_write(incomplete_record_size); |
||||
GPR_ASSERT(incomplete_record != NULL); |
||||
const size_t complete_record_size = 20; |
||||
void* complete_record = census_log_start_write(complete_record_size); |
||||
GPR_ASSERT(complete_record != NULL); |
||||
GPR_ASSERT(complete_record != incomplete_record); |
||||
census_log_end_write(complete_record, complete_record_size); |
||||
// Now iterate over blocks to read completed records.
|
||||
census_log_init_reader(); |
||||
size_t bytes_available; |
||||
const void* record_read = census_log_read_next(&bytes_available); |
||||
GPR_ASSERT(complete_record == record_read); |
||||
GPR_ASSERT(complete_record_size == bytes_available); |
||||
// Complete first record.
|
||||
census_log_end_write(incomplete_record, incomplete_record_size); |
||||
// Have read past the incomplete record, so read_next() should return NULL.
|
||||
// NB: this test also assumes our thread did not get switched to a different
|
||||
// CPU between the two start_write calls
|
||||
record_read = census_log_read_next(&bytes_available); |
||||
GPR_ASSERT(record_read == NULL); |
||||
// Reset reader to get the newly completed record.
|
||||
census_log_init_reader(); |
||||
record_read = census_log_read_next(&bytes_available); |
||||
GPR_ASSERT(incomplete_record == record_read); |
||||
GPR_ASSERT(incomplete_record_size == bytes_available); |
||||
assert_log_empty(); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Tests scenario where block being read is detached from a core and put on the
|
||||
// dirty list.
|
||||
void test_detached_while_reading(void) { |
||||
printf("Starting test: detached while reading\n"); |
||||
setup_test(0); |
||||
// Start a write.
|
||||
static const size_t DWR_RECORD_SIZE = 10; |
||||
void* record_written = census_log_start_write(DWR_RECORD_SIZE); |
||||
GPR_ASSERT(record_written != NULL); |
||||
census_log_end_write(record_written, DWR_RECORD_SIZE); |
||||
// Read this record.
|
||||
census_log_init_reader(); |
||||
size_t bytes_available; |
||||
const void* record_read = census_log_read_next(&bytes_available); |
||||
GPR_ASSERT(record_read != NULL); |
||||
GPR_ASSERT(DWR_RECORD_SIZE == bytes_available); |
||||
// Now fill the log. This will move the block being read from core-local
|
||||
// array to the dirty list.
|
||||
while ((record_written = census_log_start_write(DWR_RECORD_SIZE))) { |
||||
census_log_end_write(record_written, DWR_RECORD_SIZE); |
||||
} |
||||
|
||||
// In this iteration, read_next() should only traverse blocks in the
|
||||
// core-local array. Therefore, we expect at most gpr_cpu_num_cores() more
|
||||
// blocks. As log is full, if read_next() is traversing the dirty list, we
|
||||
// will get more than gpr_cpu_num_cores() blocks.
|
||||
int block_read = 0; |
||||
while ((record_read = census_log_read_next(&bytes_available))) { |
||||
++block_read; |
||||
GPR_ASSERT(block_read <= (int)gpr_cpu_num_cores()); |
||||
} |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Fills non-circular log with records sized such that size is a multiple of
|
||||
// CENSUS_LOG_MAX_RECORD_SIZE (no per-block fragmentation).
|
||||
void test_fill_log_no_fragmentation(void) { |
||||
printf("Starting test: fill log no fragmentation\n"); |
||||
const int circular = 0; |
||||
setup_test(circular); |
||||
fill_log(LOG_SIZE_IN_BYTES, 1 /* no fragmentation */, circular); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Fills circular log with records sized such that size is a multiple of
|
||||
// CENSUS_LOG_MAX_RECORD_SIZE (no per-block fragmentation).
|
||||
void test_fill_circular_log_no_fragmentation(void) { |
||||
printf("Starting test: fill circular log no fragmentation\n"); |
||||
const int circular = 1; |
||||
setup_test(circular); |
||||
fill_log(LOG_SIZE_IN_BYTES, 1 /* no fragmentation */, circular); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Fills non-circular log with records that may straddle end of a block.
|
||||
void test_fill_log_with_straddling_records(void) { |
||||
printf("Starting test: fill log with straddling records\n"); |
||||
const int circular = 0; |
||||
setup_test(circular); |
||||
fill_log(LOG_SIZE_IN_BYTES, 0 /* block straddling records */, circular); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Fills circular log with records that may straddle end of a block.
|
||||
void test_fill_circular_log_with_straddling_records(void) { |
||||
printf("Starting test: fill circular log with straddling records\n"); |
||||
const int circular = 1; |
||||
setup_test(circular); |
||||
fill_log(LOG_SIZE_IN_BYTES, 0 /* block straddling records */, circular); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Tests scenario where multiple writers and a single reader are using a log
|
||||
// that is configured to discard old records.
|
||||
void test_multiple_writers_circular_log(void) { |
||||
printf("Starting test: multiple writers circular log\n"); |
||||
const int circular = 1; |
||||
setup_test(circular); |
||||
multiple_writers_single_reader(circular); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Tests scenario where multiple writers and a single reader are using a log
|
||||
// that is configured to discard old records.
|
||||
void test_multiple_writers(void) { |
||||
printf("Starting test: multiple writers\n"); |
||||
const int circular = 0; |
||||
setup_test(circular); |
||||
multiple_writers_single_reader(circular); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
// Repeat the straddling records and multiple writers tests with a small log.
|
||||
void test_small_log(void) { |
||||
printf("Starting test: small log\n"); |
||||
const int circular = 0; |
||||
census_log_initialize(0, circular); |
||||
size_t log_size = census_log_remaining_space(); |
||||
GPR_ASSERT(log_size > 0); |
||||
fill_log(log_size, 0, circular); |
||||
census_log_shutdown(); |
||||
census_log_initialize(0, circular); |
||||
multiple_writers_single_reader(circular); |
||||
census_log_shutdown(); |
||||
} |
||||
|
||||
void test_performance(void) { |
||||
for (size_t write_size = 1; write_size < CENSUS_LOG_MAX_RECORD_SIZE; |
||||
write_size *= 2) { |
||||
setup_test(0); |
||||
gpr_timespec start_time = gpr_now(GPR_CLOCK_REALTIME); |
||||
int nrecords = 0; |
||||
while (1) { |
||||
void* record = census_log_start_write(write_size); |
||||
if (record == NULL) { |
||||
break; |
||||
} |
||||
census_log_end_write(record, write_size); |
||||
nrecords++; |
||||
} |
||||
gpr_timespec write_time = |
||||
gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), start_time); |
||||
double write_time_micro = |
||||
(double)write_time.tv_sec * 1000000 + (double)write_time.tv_nsec / 1000; |
||||
census_log_shutdown(); |
||||
printf( |
||||
"Wrote %d %d byte records in %.3g microseconds: %g records/us " |
||||
"(%g ns/record), %g gigabytes/s\n", |
||||
nrecords, (int)write_size, write_time_micro, |
||||
nrecords / write_time_micro, 1000 * write_time_micro / nrecords, |
||||
(double)((int)write_size * nrecords) / write_time_micro / 1000); |
||||
} |
||||
} |
||||
|
||||
int main(int argc, char** argv) { |
||||
grpc_test_init(argc, argv); |
||||
gpr_time_init(); |
||||
srand((unsigned)gpr_now(GPR_CLOCK_REALTIME).tv_nsec); |
||||
test_invalid_record_size(); |
||||
test_end_write_with_different_size(); |
||||
test_read_pending_record(); |
||||
test_read_beyond_pending_record(); |
||||
test_detached_while_reading(); |
||||
test_fill_log_no_fragmentation(); |
||||
test_fill_circular_log_no_fragmentation(); |
||||
test_fill_log_with_straddling_records(); |
||||
test_fill_circular_log_with_straddling_records(); |
||||
test_small_log(); |
||||
test_multiple_writers(); |
||||
test_multiple_writers_circular_log(); |
||||
test_performance(); |
||||
return 0; |
||||
} |
||||
@ -0,0 +1,199 @@ |
||||
<?xml version="1.0" encoding="utf-8"?> |
||||
<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\1.0.204.1.props')" /> |
||||
<ItemGroup Label="ProjectConfigurations"> |
||||
<ProjectConfiguration Include="Debug|Win32"> |
||||
<Configuration>Debug</Configuration> |
||||
<Platform>Win32</Platform> |
||||
</ProjectConfiguration> |
||||
<ProjectConfiguration Include="Debug|x64"> |
||||
<Configuration>Debug</Configuration> |
||||
<Platform>x64</Platform> |
||||
</ProjectConfiguration> |
||||
<ProjectConfiguration Include="Release|Win32"> |
||||
<Configuration>Release</Configuration> |
||||
<Platform>Win32</Platform> |
||||
</ProjectConfiguration> |
||||
<ProjectConfiguration Include="Release|x64"> |
||||
<Configuration>Release</Configuration> |
||||
<Platform>x64</Platform> |
||||
</ProjectConfiguration> |
||||
</ItemGroup> |
||||
<PropertyGroup Label="Globals"> |
||||
<ProjectGuid>{C27CEE16-2BEC-5572-3956-677E9F6F8BED}</ProjectGuid> |
||||
<IgnoreWarnIntDirInTempDetected>true</IgnoreWarnIntDirInTempDetected> |
||||
<IntDir>$(SolutionDir)IntDir\$(MSBuildProjectName)\</IntDir> |
||||
</PropertyGroup> |
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" /> |
||||
<PropertyGroup Condition="'$(VisualStudioVersion)' == '10.0'" Label="Configuration"> |
||||
<PlatformToolset>v100</PlatformToolset> |
||||
</PropertyGroup> |
||||
<PropertyGroup Condition="'$(VisualStudioVersion)' == '11.0'" Label="Configuration"> |
||||
<PlatformToolset>v110</PlatformToolset> |
||||
</PropertyGroup> |
||||
<PropertyGroup Condition="'$(VisualStudioVersion)' == '12.0'" Label="Configuration"> |
||||
<PlatformToolset>v120</PlatformToolset> |
||||
</PropertyGroup> |
||||
<PropertyGroup Condition="'$(VisualStudioVersion)' == '14.0'" Label="Configuration"> |
||||
<PlatformToolset>v140</PlatformToolset> |
||||
</PropertyGroup> |
||||
<PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration"> |
||||
<ConfigurationType>Application</ConfigurationType> |
||||
<UseDebugLibraries>true</UseDebugLibraries> |
||||
<CharacterSet>Unicode</CharacterSet> |
||||
</PropertyGroup> |
||||
<PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration"> |
||||
<ConfigurationType>Application</ConfigurationType> |
||||
<UseDebugLibraries>false</UseDebugLibraries> |
||||
<WholeProgramOptimization>true</WholeProgramOptimization> |
||||
<CharacterSet>Unicode</CharacterSet> |
||||
</PropertyGroup> |
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" /> |
||||
<ImportGroup Label="ExtensionSettings"> |
||||
</ImportGroup> |
||||
<ImportGroup Label="PropertySheets"> |
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" /> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\global.props" /> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\openssl.props" /> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\winsock.props" /> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\zlib.props" /> |
||||
</ImportGroup> |
||||
<PropertyGroup Label="UserMacros" /> |
||||
<PropertyGroup Condition="'$(Configuration)'=='Debug'"> |
||||
<TargetName>census_log_test</TargetName> |
||||
<Linkage-grpc_dependencies_zlib>static</Linkage-grpc_dependencies_zlib> |
||||
<Configuration-grpc_dependencies_zlib>Debug</Configuration-grpc_dependencies_zlib> |
||||
<Linkage-grpc_dependencies_openssl>static</Linkage-grpc_dependencies_openssl> |
||||
<Configuration-grpc_dependencies_openssl>Debug</Configuration-grpc_dependencies_openssl> |
||||
</PropertyGroup> |
||||
<PropertyGroup Condition="'$(Configuration)'=='Release'"> |
||||
<TargetName>census_log_test</TargetName> |
||||
<Linkage-grpc_dependencies_zlib>static</Linkage-grpc_dependencies_zlib> |
||||
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||||
Loading…
Reference in new issue