MPI_Wtime - Returns an elapsed time on the calling
processor
SYNOPSIS
C:
#include <mpi.h>
double MPI_Wtime()
C++:
#include <mpi.h>
double Wtime()
Fortran:
INCLUDE "mpif.h" (or USE MPI)
DOUBLE PRECISION TIME
TIME=MPI_WTIME()
STANDARDS
This release implements the MPI 1.2 standard, as
documented by the MPI Forum in the spring 1997 release of
MPI: A Message Passing Interface Standard.
DESCRIPTION
The MPI_Wtime routine returns the elapsed wall-clock time
in seconds since some time in the past on the calling
processor. This routine is intended to be a
high-resolution, elapsed (or wall) clock. See
MPI_Wtick(3) to determine the resolution of MPI_Wtime.
RETURN VALUES
Floating-point elapsed time in seconds. Note that calls
made at the same time to MPI_Wtime() on different nodes
running the same program may yield different values. The
time returned is not necessarily the elapsed wall-clock
run-time of the calling process.
If a program is checkpointed and restarted, values
returned by MPI_Wtime(3) following the restart may be
smaller than those returned before the checkpoint.
SEE ALSO
MPI_Wtick(3)
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