1 /** 2 * Copyright (c) 2016-present, Facebook, Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <cuda_runtime.h> 18 19 #include <sstream> 20 #include <vector> 21 22 #include "c10/util/Flags.h" 23 #include "caffe2/core/common_gpu.h" 24 #include "caffe2/core/init.h" 25 #include "caffe2/core/logging.h" 26 27 using std::vector; 28 29 C10_DECLARE_int(caffe2_log_level); 30 main(int argc,char ** argv)31int main(int argc, char** argv) { 32 caffe2::GlobalInit(&argc, &argv); 33 c10::SetUsageMessage( 34 "Inspects the GPUs on the current machine and prints out their details " 35 "provided by cuda."); 36 37 int gpu_count; 38 CUDA_ENFORCE(cudaGetDeviceCount(&gpu_count)); 39 for (int i = 0; i < gpu_count; ++i) { 40 LOG(INFO) << "Querying device ID = " << i; 41 caffe2::DeviceQuery(i); 42 } 43 44 vector<vector<bool> > access_pattern; 45 CAFFE_ENFORCE(caffe2::GetCudaPeerAccessPattern(&access_pattern)); 46 47 std::stringstream sstream; 48 // Find topology 49 for (int i = 0; i < gpu_count; ++i) { 50 for (int j = 0; j < gpu_count; ++j) { 51 sstream << (access_pattern[i][j] ? "+" : "-") << " "; 52 } 53 sstream << std::endl; 54 } 55 LOG(INFO) << "Access pattern: " << std::endl << sstream.str(); 56 57 return 0; 58 } 59