cf98657adb
* Update MPI_WTICK / MPI_WTIME man pages:
* Fix C++ declarations
* Note that we may use better than gettimeofday() on some platforms
* Add "MPI_WTIME support" ("options:mpi-wtime") flag in ompi_info
output indicating whether we use "native" or "gettimeofday" for
MPI_WTIME
This commit was SVN r16774.
65 строки
1.9 KiB
C
65 строки
1.9 KiB
C
/*
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* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 2006 Cisco Systems, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <stdio.h>
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#include MCA_timer_IMPLEMENTATION_HEADER
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#include "opal/prefetch.h"
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#include "ompi/mpi/c/bindings.h"
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#include "ompi/runtime/mpiruntime.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Wtime = PMPI_Wtime
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "ompi/mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Wtime";
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double MPI_Wtime(void)
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{
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double wtime;
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#if OPAL_TIMER_USEC_NATIVE
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/* We may or may not have native usec precision on Windows, so put
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this #if before the #ifdef checking for Windows. */
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wtime = ((double) opal_timer_base_get_usec()) / 1000000.0;
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#elif defined(__WINDOWS__)
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wtime = ((double) opal_timer_base_get_cycles()) /
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((double) opal_timer_base_get_freq());
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#else
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/* Fall back to gettimeofday() if we have nothing else */
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struct timeval tv;
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gettimeofday(&tv, NULL);
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wtime = tv.tv_sec;
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wtime += (double)tv.tv_usec / 1000000.0;
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#endif
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OPAL_CR_TEST_CHECKPOINT_READY();
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return wtime;
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}
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