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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; | |
} |