= MPI_Comm_rank =
Determines the rank of the calling process in the communicator
= Synopsis =
{{{
#include "mpi.h"
int MPI_Comm_rank ( MPI_Comm comm, int *rank )
}}}
= Input Parameters =
{{{
comm  communicator (handle) 
}}}
= Output Parameter =
{{{
rank  rank of the calling process in group of comm (integer) 
}}}
= Example =
[wiki:mpich/point_to_point/demo1]