1# Copyright 2019 The TensorFlow Authors. All Rights Reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14# ============================================================================== 15"""Contains GPU utility functions.""" 16 17import collections 18import re 19 20 21# Matches the DeviceAttributes.physical_device_desc field. 22_PHYSICAL_DEVICE_DESCRIPTION_REGEX = re.compile( 23 r'name: ([^,]*), (?:.*compute capability: (\d+)\.(\d+))?') 24 25 26# compute_capability is a (major version, minor version) pair, or None if this 27# is not an Nvidia GPU. 28GpuInfo = collections.namedtuple('gpu_info', ['name', 'compute_capability']) 29 30 31def compute_capability_from_device_desc(device_attrs): 32 """Returns the GpuInfo given a DeviceAttributes proto. 33 34 Args: 35 device_attrs: A DeviceAttributes proto. 36 37 Returns 38 A gpu_info tuple. Both fields are None if `device_attrs` does not have a 39 valid physical_device_desc field. 40 """ 41 # TODO(jingyue): The device description generator has to be in sync with 42 # this file. Another option is to put compute capability in 43 # DeviceAttributes, but I avoided that to keep DeviceAttributes 44 # target-independent. Reconsider this option when we have more things like 45 # this to keep in sync. 46 # LINT.IfChange 47 match = _PHYSICAL_DEVICE_DESCRIPTION_REGEX.search( 48 device_attrs.physical_device_desc) 49 # LINT.ThenChange(//tensorflow/core/common_runtime/gpu/gpu_device.cc) 50 if not match: 51 return GpuInfo(None, None) 52 cc = (int(match.group(2)), int(match.group(3))) if match.group(2) else None 53 return GpuInfo(match.group(1), cc) 54