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82 lines
3.3 KiB
82 lines
3.3 KiB
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* * Neither the name of NVIDIA CORPORATION nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/* |
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* This sample demonstrates how to use query information on the current system |
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* topology using a SDK 8.0 API. |
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*/ |
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// includes CUDA |
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#include <cuda_runtime.h> |
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// includes, project |
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#include <helper_cuda.h> |
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#include <helper_functions.h> // helper for shared that are common to CUDA Samples |
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int main(int argc, char **argv) { |
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int deviceCount = 0; |
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checkCudaErrors(cudaGetDeviceCount(&deviceCount)); |
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// Enumerates Device <-> Device links |
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for (int device1 = 0; device1 < deviceCount; device1++) { |
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for (int device2 = 0; device2 < deviceCount; device2++) { |
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if (device1 == device2) continue; |
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int perfRank = 0; |
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int atomicSupported = 0; |
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int accessSupported = 0; |
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checkCudaErrors(cudaDeviceGetP2PAttribute( |
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&accessSupported, cudaDevP2PAttrAccessSupported, device1, device2)); |
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checkCudaErrors(cudaDeviceGetP2PAttribute( |
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&perfRank, cudaDevP2PAttrPerformanceRank, device1, device2)); |
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checkCudaErrors(cudaDeviceGetP2PAttribute( |
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&atomicSupported, cudaDevP2PAttrNativeAtomicSupported, device1, |
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device2)); |
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if (accessSupported) { |
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std::cout << "GPU" << device1 << " <-> GPU" << device2 << ":" |
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<< std::endl; |
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std::cout << " * Atomic Supported: " |
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<< (atomicSupported ? "yes" : "no") << std::endl; |
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std::cout << " * Perf Rank: " << perfRank << std::endl; |
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} |
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} |
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} |
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// Enumerates Device <-> Host links |
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for (int device = 0; device < deviceCount; device++) { |
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int atomicSupported = 0; |
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checkCudaErrors(cudaDeviceGetAttribute( |
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&atomicSupported, cudaDevAttrHostNativeAtomicSupported, device)); |
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std::cout << "GPU" << device << " <-> CPU:" << std::endl; |
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std::cout << " * Atomic Supported: " << (atomicSupported ? "yes" : "no") |
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<< std::endl; |
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} |
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return 0; |
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}
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