# MPI_Wtime

Returns an elapsed time on the calling processor

## Synopsis

    double MPI_Wtime(void)

## Return value

Time in seconds since an arbitrary time in the past.

## Notes

This is intended to be a high-resolution, elapsed (or wall) clock. See `MPI_WTICK` to determine the resolution of `MPI_WTIME`. If the attribute `MPI_WTIME_IS_GLOBAL` is defined and true, then the value is synchronized across all processes in `MPI_COMM_WORLD`.

## Notes for Fortran

This is a function, declared as `DOUBLE PRECISION MPI_WTIME()` in Fortran.

## See Also

also: MPI_Wtick, MPI_Comm_get_attr, MPI_Attr_get