cudagpugpgpunvidia

How to measure the inner kernel time in NVIDIA CUDA?

I want to measure time inner kernel of GPU, how how to measure it in NVIDIA CUDA? e.g.

__global__ void kernelSample()
{
  some code here
  get start time 
  some code here 
  get stop time 
  some code here
}
Solution

  • Try this, it measures time between 2 events in milliseconds.

      cudaEvent_t start, stop;
  float elapsedTime;

  cudaEventCreate(&start);
  cudaEventRecord(start,0);

 //Do kernel activity here

 cudaEventCreate(&stop);
 cudaEventRecord(stop,0);
 cudaEventSynchronize(stop);

 cudaEventElapsedTime(&elapsedTime, start,stop);
 printf("Elapsed time : %f ms\n" ,elapsedTime);