/*D
   MPI_Comm_size - Determines the size of the group associated with a communicator

Synopsis:
.vb
int MPI_Comm_size(MPI_Comm comm, int *size)
.ve

Input Parameters:
. comm - communicator (handle)

Output Parameters:
. size - number of processes in the group of comm (integer)

.N NULL

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_COMM
.N MPI_ERR_OTHER

D*/

