64 lines
2 KiB
Python
64 lines
2 KiB
Python
# Copyright (c) 2021, NVIDIA CORPORATION. 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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# ==============================================================================
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import math
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import os
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import pynvml
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pynvml.nvmlInit()
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def systemGetDriverVersion():
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return pynvml.nvmlSystemGetDriverVersion()
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def deviceGetCount():
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return pynvml.nvmlDeviceGetCount()
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class device:
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# assume nvml returns list of 64 bit ints
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_nvml_affinity_elements = math.ceil(os.cpu_count() / 64)
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def __init__(self, device_idx):
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super().__init__()
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self.handle = pynvml.nvmlDeviceGetHandleByIndex(device_idx)
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def getName(self):
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return pynvml.nvmlDeviceGetName(self.handle)
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def getCpuAffinity(self):
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affinity_string = ''
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for j in pynvml.nvmlDeviceGetCpuAffinity(
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self.handle, device._nvml_affinity_elements
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):
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# assume nvml returns list of 64 bit ints
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affinity_string = '{:064b}'.format(j) + affinity_string
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affinity_list = [int(x) for x in affinity_string]
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affinity_list.reverse() # so core 0 is in 0th element of list
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return [i for i, e in enumerate(affinity_list) if e != 0]
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def set_affinity(gpu_id=None):
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if gpu_id is None:
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gpu_id = int(os.getenv('LOCAL_RANK', 0))
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dev = device(gpu_id)
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os.sched_setaffinity(0, dev.getCpuAffinity())
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# list of ints representing the logical cores this process is now affinitied with
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return os.sched_getaffinity(0)
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