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# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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SIZE_UNIT = ['K', 'M', 'G', 'T']
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SHM_QUERY_CMD = 'df -h'
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SHM_KEY = 'shm'
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SHM_DEFAULT_MOUNT = '/dev/shm'
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# [ shared memory size check ]
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# In detection models, image/target data occupies a lot of memory, and
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# will occupy lots of shared memory in multi-process DataLoader, we use
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# following code to get shared memory size and perform a size check to
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# disable shared memory use if shared memory size is not enough.
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# Shared memory getting process as follows:
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# 1. use `df -h` get all mount info
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# 2. pick up spaces whose mount info contains 'shm'
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# 3. if 'shm' space number is only 1, return its size
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# 4. if there are multiple 'shm' space, try to find the default mount
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# directory '/dev/shm' is Linux-like system, otherwise return the
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# biggest space size.
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def _parse_size_in_M(size_str):
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num, unit = size_str[:-1], size_str[-1]
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assert unit in SIZE_UNIT, \
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"unknown shm size unit {}".format(unit)
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return float(num) * \
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(1024 ** (SIZE_UNIT.index(unit) - 1))
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def _get_shared_memory_size_in_M():
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try:
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df_infos = os.popen(SHM_QUERY_CMD).readlines()
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except:
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return None
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else:
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shm_infos = []
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for df_info in df_infos:
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info = df_info.strip()
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if info.find(SHM_KEY) >= 0:
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shm_infos.append(info.split())
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if len(shm_infos) == 0:
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return None
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elif len(shm_infos) == 1:
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return _parse_size_in_M(shm_infos[0][3])
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else:
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default_mount_infos = [
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si for si in shm_infos if si[-1] == SHM_DEFAULT_MOUNT
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]
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if default_mount_infos:
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return _parse_size_in_M(default_mount_infos[0][3])
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else:
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return max([_parse_size_in_M(si[3]) for si in shm_infos])
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