[Solved] C++ timer library and Compute Shaders

Engines and Middleware Programming

Started by Martin Perry March 21, 2012 09:26 AM

2 comments, last by Martin Perry 12 years, 1 month ago

1,557

Author

March 21, 2012 09:26 AM

Hi, i have problem measuring times of compute shaders.

I am using QueryPerformanceCounter (and for checking also clock()). Both gave +- same results in ms. But if I measure time on my stopwatch

I gave totally different time.
C++ timer says 10ms, but its rubbish. Application (computer) freezes for about 30 seconds during shader execution.

How can I measure this ?

Thanks

Hodgman

52,717

March 21, 2012 10:41 AM

I'm guessing that you're measuring the amount of time it takes for the CPU to submit your workload, not the amount of time it takes the GPU to actually execute the work?
Perhaps you should post some code or describe your testing methodology.

. 22 Racing Series .

Martin Perry

1,557

Author

March 21, 2012 12:54 PM

Version with clock

clock_t initial = clock();

this->deviceContext->Dispatch(this->group.x, this->group.y, this->group.z);



clock_t current = clock();

float diff = (current - initial); //ms