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



1.4.1                            Jan 14, 2010                     MPI_Wtick(3)
