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Sample example to compare perf of cudaGetDeviceProperties and cudaDeviceGetAttribute
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| // Compiling and running this program: | |
| // nvcc -std=c++11 device-prop-test.cu && ./a.out | |
| #include <chrono> | |
| #include <iostream> | |
| using namespace std; | |
| #define CUDA_CHECK(call) \ | |
| do { \ | |
| cudaError_t status = call; \ | |
| if(status != cudaSuccess) { \ | |
| printf("FAIL: call='%s'. Reason:%s\n", #call, \ | |
| cudaGetErrorString(status)); \ | |
| return -1; \ | |
| } \ | |
| } while (0) | |
| int main(int argc, char** argv) { | |
| int devId; | |
| CUDA_CHECK(cudaGetDevice(&devId)); | |
| auto start = chrono::high_resolution_clock::now(); | |
| cudaDeviceProp prop; | |
| for(int i = 0; i < 25; ++i) { | |
| CUDA_CHECK(cudaGetDeviceProperties(&prop, devId)); | |
| } | |
| auto end = chrono::high_resolution_clock::now(); | |
| cout | |
| << "cudaGetDeviceProperties -> " | |
| << chrono::duration_cast<chrono::microseconds>(end - start).count() / 25.0 | |
| << "us" << endl; | |
| int smemSize, numProcs; | |
| start = chrono::high_resolution_clock::now(); | |
| for(int i = 0; i < 25; ++i) { | |
| CUDA_CHECK(cudaDeviceGetAttribute(&smemSize, | |
| cudaDevAttrMaxSharedMemoryPerBlock, | |
| devId)); | |
| CUDA_CHECK(cudaDeviceGetAttribute(&numProcs, | |
| cudaDevAttrMultiProcessorCount, | |
| devId)); | |
| } | |
| end = chrono::high_resolution_clock::now(); | |
| cout | |
| << "cudaDeviceGetAttribute -> " | |
| << chrono::duration_cast<chrono::microseconds>(end - start).count() / 25.0 | |
| << "us" << endl; | |
| return 0; | |
| } |
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I have stolen cuda_check macro from you !! thanks..