Question

Is there any way to stop OpenCL kernel from execution?
For example, I launch the kernel, do some computations, and then stop it if some conditions were met, otherwise, I wait until it finishes:

clEnqueueNDRange(queue, ...); // start kernel function

// do other stuff...
// ...

if (some condition met) {
    stopKernel();
} else { 
    clFinish(queue);
}

Thank you for help

Answer 1

No. Once you have enqueued your kernel, it will run to completion.

One way to accomplish something like the above is to do this:

while ( data_left_to_process ) {

   clEnqueueNDRangeKernel( ..., NDRange for a portion of the data, ... )

   // other work

   if (condition) {
      break;
   }

   // adjust NDRange for next execution to processes the next part of your data

}

clFinish(queue);

This allows you avoid processing ALL the data, with the obvious tradeoff that you’re now submitting work in smaller chunks, which will probably have a performance impact.