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 17from __future__ import absolute_import 18from __future__ import division 19from __future__ import print_function 20 21import collections 22import re 23 24 25# Matches the DeviceAttributes.physical_device_desc field. 26_PHYSICAL_DEVICE_DESCRIPTION_REGEX = re.compile( 27 r'name: ([^,]*), (?:.*compute capability: (\d+)\.(\d+))?') 28 29 30# compute_capability is a (major version, minor version) pair, or None if this 31# is not an Nvidia GPU. 32GpuInfo = collections.namedtuple('gpu_info', ['name', 'compute_capability']) 33 34 35def compute_capability_from_device_desc(device_attrs): 36 """Returns the GpuInfo given a DeviceAttributes proto. 37 38 Args: 39 device_attrs: A DeviceAttributes proto. 40 41 Returns 42 A gpu_info tuple. Both fields are None if `device_attrs` does not have a 43 valid physical_device_desc field. 44 """ 45 # TODO(jingyue): The device description generator has to be in sync with 46 # this file. Another option is to put compute capability in 47 # DeviceAttributes, but I avoided that to keep DeviceAttributes 48 # target-independent. Reconsider this option when we have more things like 49 # this to keep in sync. 50 # LINT.IfChange 51 match = _PHYSICAL_DEVICE_DESCRIPTION_REGEX.search( 52 device_attrs.physical_device_desc) 53 # LINT.ThenChange(//tensorflow/core/common_runtime/gpu/gpu_device.cc) 54 if not match: 55 return GpuInfo(None, None) 56 cc = (int(match.group(2)), int(match.group(3))) if match.group(2) else None 57 return GpuInfo(match.group(1), cc) 58