MPI_GROUP_SIZE, MPI_Group_size

Purpose

Returns the number of tasks in a group.

C synopsis

#include <mpi.h>
int MPI_Group_size(MPI_Group group,int *size);

C++ synopsis

#include mpi.h
int MPI::Group::Get_size() const;

FORTRAN synopsis

include 'mpif.h' or use mpi
MPI_GROUP_SIZE(INTEGER GROUP,INTEGER SIZE,INTEGER IERROR)

Parameters

group
     is the group (handle) (IN)

size
     is the number of tasks in the group (integer) (OUT)

IERROR
     is the FORTRAN return code. It is always the last argument.

Description

This subroutine returns the number of tasks in a group. This is a local
operation and does not require any intertask communication.

Errors

Invalid group

MPI not initialized

MPI already finalized

Related information