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MPI_WTICK(3) Open MPI MPI_WTICK(3)

NAME

MPI_Wtick - Returns the resolution of :ref:`MPI_Wtime`.

MPI_Wtick — Returns the resolution of MPI_Wtime <#mpi-wtime>.

SYNTAX

C Syntax

double MPI_Wtick(void)


Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
DOUBLE PRECISION MPI_WTICK()


Fortran 2008 Syntax

USE mpi_f08
DOUBLE PRECISION MPI_Wtick()


RETURN VALUE

Time in seconds of resolution of MPI_Wtime <#mpi-wtime>.

DESCRIPTION

MPI_Wtick returns the resolution of MPI_Wtime <#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 <#mpi-init> or after MPI_Finalize <#mpi-finalize> is undefined.

See also:

•
MPI_Wtime <#mpi-wtime>



Author

The Open MPI community

Copyright

2003-2026, The Open MPI Community

October 13, 2026