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90 lines
2.9 KiB
90 lines
2.9 KiB
/* |
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* |
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* breakevenHtoDMemcpy.cu |
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* |
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* Microbenchmark to shmoo CPU overhead of host->device memcpy. |
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* |
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* Build with: nvcc -I ../chLib <options> breakevenHtoDMemcpy.cu |
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* Requires: No minimum SM requirement. |
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* |
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* Copyright (c) 2011-2012, Archaea Software, LLC. |
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* All rights reserved. |
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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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int |
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main( int argc, char *argv[] ) |
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{ |
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cudaError_t status; |
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int *deviceInt = 0; |
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int *hostInt = 0; |
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const int cIterations = 100000; |
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const size_t numBytes = 65536; |
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const size_t byteIncrement = 4096; |
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printf( "D->H memcpy times...\n" ); |
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printf( "Size\tTime (us)\n" ); |
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fflush( stdout ); |
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chTimerTimestamp start, stop; |
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cuda(Malloc( &deviceInt, numBytes ) ); |
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cuda(HostAlloc( &hostInt, numBytes, 0 ) ); |
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for ( size_t byteCount = byteIncrement; |
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byteCount <= numBytes; |
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byteCount += byteIncrement ) |
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{ |
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printf( "%d\t", (int) byteCount ); |
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chTimerGetTime( &start ); |
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for ( int i = 0; i < cIterations; i++ ) { |
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cuda(MemcpyAsync( deviceInt, hostInt, byteCount, |
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cudaMemcpyHostToDevice, NULL ) ); |
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} |
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cuda(DeviceSynchronize() ); |
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chTimerGetTime( &stop ); |
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{ |
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double microseconds = 1e6*chTimerElapsedTime( &start, &stop ); |
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double usPerMemcpy = microseconds / (float) cIterations; |
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printf( "%.2f\n", usPerMemcpy ); |
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} |
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} |
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cudaFree( deviceInt ); |
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cudaFreeHost( hostInt ); |
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return 0; |
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Error: |
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printf( "Error performing allocation\n" ); |
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return 1; |
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}
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