MPI_Wtick man page on Oracle

MPI_Wtick man page on Oracle

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MPI_Wtick(3)			   Open MPI			  MPI_Wtick(3)

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

1.6.4				 Feb 19, 2013			  MPI_Wtick(3)

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