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/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2018 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2006-2022 Cisco Systems, Inc. All rights reserved
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2017 IBM Corporation. All rights reserved.
* Copyright (c) 2017 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2024 NVIDIA Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <stdio.h>
#ifdef HAVE_TIME_H
#include <time.h>
#endif /* HAVE_TIME_H */
#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/mpiruntime.h"
#include "ompi/runtime/ompi_spc.h"
#include "opal/util/clock_gettime.h"
#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Wtime = PMPI_Wtime
#endif
#define MPI_Wtime PMPI_Wtime
#endif
/**
* Use this as a base time set early during MPI initialization to improve the range
* and accuracy of the user visible timer.
* More info: https://github.com/mpi-forum/mpi-issues/issues/77#issuecomment-369663119
*/
extern struct timespec ompi_wtime_time_origin;
double MPI_Wtime(void)
{
double wtime;
SPC_RECORD(OMPI_SPC_WTIME, 1);
// We intentionally don't use the OPAL timer framework here. See
// https://github.com/open-mpi/ompi/issues/3003 for more details.
struct timespec tp;
(void) opal_clock_gettime(&tp);
wtime = (double)(tp.tv_nsec - ompi_wtime_time_origin.tv_nsec)/1.0e+9;
wtime += (tp.tv_sec - ompi_wtime_time_origin.tv_sec);
return wtime;
}
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