mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-28 16:39:15 +08:00
83 lines
3.3 KiB
Plaintext
83 lines
3.3 KiB
Plaintext
|
/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* * Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* * Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* * Neither the name of NVIDIA CORPORATION nor the names of its
|
||
|
|
* contributors may be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
|
||
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
||
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
||
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
||
|
|
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This sample demonstrates how to use query information on the current system
|
||
|
|
* topology using a SDK 8.0 API.
|
||
|
|
*/
|
||
|
|
|
||
|
|
// includes CUDA
|
||
|
|
#include <cuda_runtime.h>
|
||
|
|
|
||
|
|
// includes, project
|
||
|
|
#include <helper_cuda.h>
|
||
|
|
#include <helper_functions.h> // helper for shared that are common to CUDA Samples
|
||
|
|
|
||
|
|
int main(int argc, char **argv) {
|
||
|
|
int deviceCount = 0;
|
||
|
|
checkCudaErrors(cudaGetDeviceCount(&deviceCount));
|
||
|
|
|
||
|
|
// Enumerates Device <-> Device links
|
||
|
|
for (int device1 = 0; device1 < deviceCount; device1++) {
|
||
|
|
for (int device2 = 0; device2 < deviceCount; device2++) {
|
||
|
|
if (device1 == device2) continue;
|
||
|
|
|
||
|
|
int perfRank = 0;
|
||
|
|
int atomicSupported = 0;
|
||
|
|
int accessSupported = 0;
|
||
|
|
|
||
|
|
checkCudaErrors(cudaDeviceGetP2PAttribute(
|
||
|
|
&accessSupported, cudaDevP2PAttrAccessSupported, device1, device2));
|
||
|
|
checkCudaErrors(cudaDeviceGetP2PAttribute(
|
||
|
|
&perfRank, cudaDevP2PAttrPerformanceRank, device1, device2));
|
||
|
|
checkCudaErrors(cudaDeviceGetP2PAttribute(
|
||
|
|
&atomicSupported, cudaDevP2PAttrNativeAtomicSupported, device1,
|
||
|
|
device2));
|
||
|
|
|
||
|
|
if (accessSupported) {
|
||
|
|
std::cout << "GPU" << device1 << " <-> GPU" << device2 << ":"
|
||
|
|
<< std::endl;
|
||
|
|
std::cout << " * Atomic Supported: "
|
||
|
|
<< (atomicSupported ? "yes" : "no") << std::endl;
|
||
|
|
std::cout << " * Perf Rank: " << perfRank << std::endl;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Enumerates Device <-> Host links
|
||
|
|
for (int device = 0; device < deviceCount; device++) {
|
||
|
|
int atomicSupported = 0;
|
||
|
|
checkCudaErrors(cudaDeviceGetAttribute(
|
||
|
|
&atomicSupported, cudaDevAttrHostNativeAtomicSupported, device));
|
||
|
|
std::cout << "GPU" << device << " <-> CPU:" << std::endl;
|
||
|
|
std::cout << " * Atomic Supported: " << (atomicSupported ? "yes" : "no")
|
||
|
|
<< std::endl;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|