MPI_Wtick(3OpenMPI)MPI_Wtick(3OpenMPI)NAME
MPI_Wtick - Returns the resolution of MPI_Wtime.
SYNTAX C Syntax
#include <mpi.h>
double MPI_Wtick()
Fortran Syntax
INCLUDE 'mpif.h'
DOUBLE PRECISION MPI_WTICK()
C++ Syntax
#include <mpi.h>
double Wtick()
RETURN VALUE
Time in seconds of resolution of MPI_Wtime.
DESCRIPTION
MPI_Wtick returns the resolution of MPI_Wtime in seconds. That is, it returns, as a double-precision value, the number of seconds between
successive clock ticks. For example, if the clock is implemented by the hardware as a counter that is incremented every millisecond, the
value returned by MPI_Wtick should be 10^-3.
NOTE
This function does not return an error value. Consequently, the result of calling it before MPI_Init or after MPI_Finalize is undefined.
SEE ALSO
MPI_Wtime
Open MPI 1.2 September 2006 MPI_Wtick(3OpenMPI)
Check Out this Related Man Page
MPI_Wtime(3) LAM/MPI MPI_Wtime(3)NAME
MPI_Wtime - Returns an elapsed time on the calling processor
SYNOPSIS
#include <mpi.h>
double MPI_Wtime(void)
RETURN VALUE
Time in seconds since an arbitrary time in the past.
NOTES
This is intended to be a high-resolution, elapsed (or wall) clock. See MPI_Wtick to determine the resolution of MPI_Wime
. If the attribute MPI_WTIME_IS_GLOBAL is defined and true, then the value is synchronized across all processes in MPI_COMM_WORLD
.
NOTES FOR FORTRAN
This function is declared as DOUBLE PRECISION MPI_WTIME() in Fortran.
SEE ALSO
MPI_Wtick, MPI_Comm_get_attr
MORE INFORMATION
For more information, please see the official MPI Forum web site, which contains the text of both the MPI-1 and MPI-2 standards. These
documents contain detailed information about each MPI function (most of which is not duplicated in these man pages).
http://www.mpi-forum.org/
ACKNOWLEDGEMENTS
The LAM Team would like the thank the MPICH Team for the handy program to generate man pages ("doctext" from ftp://ftp.mcs.anl.gov/pub/sow-
ing/sowing.tar.gz ), the initial formatting, and some initial text for most of the MPI-1 man pages.
LOCATION
wtime.c
LAM /MPI 6.5.8 11/10/2002 MPI_Wtime(3)
Manufacturer Links
General Information
Home Page: IBM United States
Documentation/Information: IBM System p - UNIX servers: Support and services
pSeries and AIX Information Center
Developerworks AIX Wiki: AIX Wiki
AIX for System Administrators
In-depth information from IBM:
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