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MPI_Group_size.3.rst

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MPI_Group_size

:ref:`MPI_Group_size` - Returns the size of a group.

SYNTAX

C Syntax

#include <mpi.h>

int MPI_Group_size(MPI_Group group, int *size)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_GROUP_SIZE(GROUP, SIZE, IERROR)
     INTEGER GROUP, SIZE, IERROR

Fortran 2008 Syntax

USE mpi_f08
MPI_Group_size(group, size, ierror)
     TYPE(MPI_Group), INTENT(IN) :: group
     INTEGER, INTENT(OUT) :: size
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

  • group: Group (handle).

OUTPUT PARAMETERS

  • size: Number of processes in the group (integer).
  • ierror: Fortran only: Error status (integer).

DESCRIPTION

:ref:`MPI_Group_size` returns in size the number of processes in the group. Thus, if group = MPI_GROUP_EMPTY, then the call will return size = 0. On the other hand, a call with group = MPI_GROUP_NULL is erroneous.

ERRORS