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110 lines
3.5 KiB
110 lines
3.5 KiB
/* |
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* |
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* eventRecord.cu |
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* |
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* Microbenchmark for throughput of event recording |
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* |
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* Build with: nvcc -I ../chLib <options> eventRecord.cu |
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* Requires: No minimum SM requirement. |
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* |
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* Copyright (c) 2011-2014, Archaea Software, LLC. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <stdio.h> |
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#include "chError.h" |
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#include "chTimer.h" |
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__global__ |
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void |
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NullKernel() |
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{ |
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} |
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#define EVENTRECORD_LAUNCH 0x01 |
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#define EVENTRECORD_BLOCKING 0x02 |
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template<int Flags> |
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double |
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usPerLaunch( int cIterations, int cEvents ) |
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{ |
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cudaError_t status; |
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double microseconds, ret; |
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cudaEvent_t *events = new cudaEvent_t[cEvents]; |
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chTimerTimestamp start, stop; |
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if ( ! events ) goto Error; |
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memset( events, 0, cEvents*sizeof(cudaEvent_t) ); |
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for ( int i = 0; i < cEvents; i++ ) { |
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cuda(EventCreateWithFlags( &events[i], (Flags & EVENTRECORD_BLOCKING) ? cudaEventBlockingSync : 0 ) ); |
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} |
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chTimerGetTime( &start ); |
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for ( int i = 0; i < cIterations; i++ ) { |
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if ( Flags & EVENTRECORD_LAUNCH) NullKernel<<<1,1>>>(); |
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for ( int j = 0; j < cEvents; j++ ) { |
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cuda(EventRecord( events[j], NULL ) ); |
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} |
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} |
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cuda(DeviceSynchronize() ); |
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chTimerGetTime( &stop ); |
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microseconds = 1e6*chTimerElapsedTime( &start, &stop ); |
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if ( cEvents ) cIterations *= cEvents; |
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ret = microseconds / (float) cIterations; |
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Error: |
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if ( events ) { |
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for ( int i = 0; i < cEvents; i++ ) { |
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cudaEventDestroy( events[i] ); |
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} |
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} |
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delete[] events; |
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return (status) ? 0.0 : ret; |
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} |
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int |
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main( int argc, char *argv[] ) |
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{ |
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cudaFree( 0 ); |
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const int cIterations = 10000; |
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printf( "Measuring blocking event record overhead...\n" ); fflush( stdout ); |
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printf( "#events\tus per event signaling\n" ); |
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for ( int cEvents = 0; cEvents < 5; cEvents += 1 ) { |
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printf( "%d\t%.2f\n", cEvents*10, usPerLaunch<EVENTRECORD_BLOCKING>(cIterations, cEvents) ); |
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} |
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printf( "Measuring asynchronous launch+event signaling...\n" ); fflush( stdout ); |
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for ( int cEvents = 0; cEvents < 5; cEvents += 1 ) { |
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printf( "%d\t%.2f\n", cEvents*10, usPerLaunch<EVENTRECORD_LAUNCH | EVENTRECORD_BLOCKING>(cIterations, cEvents) ); |
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} |
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return 0; |
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} |
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