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https://github.com/NVIDIA/cuda-samples.git
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83 lines
3.3 KiB
Plaintext
83 lines
3.3 KiB
Plaintext
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/* Copyright (c) 2021, 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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