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MPI_Wtick
Langue: en
Version: Mar 18, 2009 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
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 MPI::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 that on POSIX platforms, Open MPI should always return 10^-6 for MPI_Wtick. The returned value may be different on Windows platforms.
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
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