測量CUDA kernel的執行時間

以下是我找到一些測試kernel function的方法:

1. cutCreateTimer : 單位 ms ->據說在GPU上比較準(我自己實際測好像也是如此)

#include <cutil_inline.h>
....

// create and start timer
     unsigned int timer = 0;
     cutilCheckError(cutCreateTimer(&timer));
     cutilCheckError(cutStartTimer(timer));

....

// stop and destroy timer

    cutilCheckError(cutStopTimer(timer));

    printf("GPU Processing time: %f (ms) \n", cutGetTimerValue(timer));

    cutilCheckError(cutDeleteTimer(timer));

2. cuda event: 單位 ms ->還在測試準度...感覺沒上面來的精準

.....

cudaEvent_t gpu0,gpu1;
cudaEventCreate(&gpu0);

cudaEventCreate(&gpu1);
...
// Start
cudaEventRecord(gpu0, 0);

.... // your program
// stop
cudaEventRecord(gpu1, 0);
cudaEventSynchronize(gpu1); // not sure if we have to add this one....

float gpu_time;
cudaEventElapsedTime(&gputime, gpu0, gpu1);
printf(" %f " ,gpu_time);