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/*
*
* nullKernelAsync.cu
*
* Microbenchmark for throughput of asynchronous kernel launch.
*
* Build with: nvcc -I ../chLib <options> nullKernelAsync.cu
* Requires: No minimum SM requirement.
*
* Copyright (c) 2011-2014, Archaea Software, LLC.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdio.h>
#include "chError.h"
#include "chTimer.h"
__global__
void
NullKernel()
{
}
double
usPerLaunch( int cIterations )
{
cudaError_t status;
double microseconds, ret;
chTimerTimestamp start, stop;
cuda(Free(0));
chTimerGetTime( &start );
for ( int i = 0; i < cIterations; i++ ) {
NullKernel<<<1,1>>>();
}
cuda(ThreadSynchronize());
chTimerGetTime( &stop );
microseconds = 1e6*chTimerElapsedTime( &start, &stop );
ret = microseconds / (float) cIterations;
Error:
return (status) ? 0.0 : ret;
}
int
main( int argc, char *argv[] )
{
const int cIterations = 100000;
printf( "Measuring asynchronous launch time... " ); fflush( stdout );
printf( "%.2f us\n", usPerLaunch(cIterations) );
return 0;
}