= MPI_Wtime =
Returns an elapsed time on the calling processor 

= Synopsis =
{{{
  #include "mpi.h"
  double MPI_Wtime()
}}}

= 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.