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90 lines
2.6 KiB
90 lines
2.6 KiB
4 years ago
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#!/usr/bin/env python3
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"""Benchmarks the current working directory against a given baseline.
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This script benchmarks both size and speed. Sample output:
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"""
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import contextlib
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import json
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import os
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import re
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import subprocess
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import sys
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import tempfile
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@contextlib.contextmanager
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def GitWorktree(commit):
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tmpdir = tempfile.mkdtemp()
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subprocess.run(['git', 'worktree', 'add', '-q', '-d', tmpdir, commit], check=True)
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cwd = os.getcwd()
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os.chdir(tmpdir)
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try:
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yield tmpdir
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finally:
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os.chdir(cwd)
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subprocess.run(['git', 'worktree', 'remove', tmpdir], check=True)
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def Run(cmd):
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subprocess.check_call(cmd, shell=True)
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def Benchmark(outbase, bench_cpu=True, runs=12, fasttable=False):
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tmpfile = "/tmp/bench-output.json"
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Run("rm -rf {}".format(tmpfile))
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#Run("CC=clang bazel test ...")
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if fasttable:
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extra_args = " --//:fasttable_enabled=true"
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else:
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extra_args = ""
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if bench_cpu:
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Run("CC=clang bazel build -c opt --copt=-march=native benchmarks:benchmark" + extra_args)
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Run("./bazel-bin/benchmarks/benchmark --benchmark_out_format=json --benchmark_out={} --benchmark_repetitions={}".format(tmpfile, runs))
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with open(tmpfile) as f:
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bench_json = json.load(f)
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# Translate into the format expected by benchstat.
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with open(outbase + ".txt", "w") as f:
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for run in bench_json["benchmarks"]:
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name = run["name"]
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name = name.replace(" ", "")
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name = re.sub(r'^BM_', 'Benchmark', name)
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if name.endswith("_mean") or name.endswith("_median") or name.endswith("_stddev"):
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continue
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values = (name, run["iterations"], run["cpu_time"])
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print("{} {} {} ns/op".format(*values), file=f)
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Run("CC=clang bazel build -c opt --copt=-g tests:conformance_upb" + extra_args)
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Run("cp -f bazel-bin/tests/conformance_upb {}.bin".format(outbase))
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baseline = "master"
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bench_cpu = False
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fasttable = False
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if len(sys.argv) > 1:
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baseline = sys.argv[1]
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# Quickly verify that the baseline exists.
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with GitWorktree(baseline):
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pass
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# Benchmark our current directory first, since it's more likely to be broken.
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Benchmark("/tmp/new", bench_cpu, fasttable=fasttable)
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# Benchmark the baseline.
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with GitWorktree(baseline):
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Benchmark("/tmp/old", bench_cpu, fasttable=fasttable)
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print()
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print()
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if bench_cpu:
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Run("~/go/bin/benchstat /tmp/old.txt /tmp/new.txt")
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print()
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print()
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Run("objcopy --strip-debug /tmp/old.bin /tmp/old.bin.stripped")
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Run("objcopy --strip-debug /tmp/new.bin /tmp/new.bin.stripped")
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Run("~/code/bloaty/bloaty /tmp/new.bin.stripped -- /tmp/old.bin.stripped --debug-file=/tmp/old.bin --debug-file=/tmp/new.bin -d compileunits,symbols")
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