MPIGroupsize(3OpenMPI) MPIGroupsize(3OpenMPI)

NAME
       MMPPIIGGrroouuppssiizzee - Returns the size of a group.


SSYYNNTTAAXX
CC SSyynnttaaxx
       #include 
       int MPIGroupsize(MPIGroup group, int *size)


FFoorrttrraann SSyynnttaaxx
       INCLUDE 'mpif.h'
       MPIGROUPSIZE(GROUP, SIZE, IERROR)
            INTEGER   GROUP, SIZE, IERROR


CC++++ SSyynnttaaxx
       #include 
       int Group::Getsize() const


IINNPPUUTT PPAARRAAMMEETTEERRSS
       group     Group (handle).


OOUUTTPPUUTT PPAARRAAMMEETTEERRSS
       size      Number of processes in the group (integer).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPIGroupsize  returns  in  size the number of processes in the group.
       Thus, if group = MPIGROUPEMPTY, then the call will return size  =  0.
       On the other hand, a call with group = MPIGROUPNULL is erroneous.


EERRRROORRSS
       Almost  all MPI routines return an error value; C routines as the value
       of the function and Fortran routines in the last  argument.  C++  func-
       tions  do  not  return  errors.  If the default error handler is set to
       MPI::ERRORSTHROWEXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before  the  error  value is returned, the current MPI error handler is
       called. By default, this error handler aborts the MPI job,  except  for
       I/O   function   errors.   The   error  handler  may  be  changed  with
       MPICommseterrhandler; the predefined error handler MPIERRORSRETURN
       may  be  used  to cause error values to be returned. Note that MPI does
       not guarantee that an MPI program can continue past an error.




Open MPI 1.2                    September 2006        MPIGroupsize(3OpenMPI)