# 18.2.466. MPI_Wtick

MPI_Wtick — Returns the resolution of MPI_Wtime.

## 18.2.466.1. SYNTAX

### 18.2.466.1.1. C Syntax

    #include <mpi.h>

    double MPI_Wtick()

### 18.2.466.1.2. Fortran Syntax

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

### 18.2.466.1.3. Fortran 2008 Syntax

    USE mpi_f08
    DOUBLE PRECISION MPI_WTICK()

## 18.2.466.2. RETURN VALUE

Time in seconds of resolution of MPI_Wtime.

## 18.2.466.3. 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.

## 18.2.466.4. 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