MPI_Comm_size(3)

NAME
     MPI_Comm_size - Determines the size of the group associated with a
     communicator

SYNOPSIS
     C:

          #include <mpi.h>

          int MPI_Comm_size ( comm, size )
          MPI_Comm comm;
          int *size;


     C++:

          #include <mpi.h>

          int Comm::Get_size() const


     Fortran:

          INCLUDE "mpif.h" (or USE MPI)

          INTEGER comm, size, ierror

          CALL MPI_COMM_SIZE(comm, size, ierror)


STANDARDS
     This release implements the MPI 1.2 standard, as documented by the MPI
     Forum in the spring 1997 release of MPI:  A Message Passing Interface
     Standard.

DESCRIPTION
     The MPI_Comm_size routine determines the number of processes in the group
     associated with a communicator.  This routine accepts the following
     parameters:

     comm      Specifies the communicator (handle)

     size      Returns the number of processes in the group of comm (integer)

     ierror    Specifies the return code value for successful completion,
               which is in MPI_SUCCESS.  MPI_SUCCESS is defined in the mpif.h
               file.

NOTES
     MPI_COMM_NULL is not considered a valid argument to this function.