MPIPartition1D.c File Reference

Compute the local size. More...

#include <stdio.h>
#include <mpivars.h>

Go to the source code of this file.

Functions
int	MPIPartition1D (int nglobal, int nproc, int rank)

Detailed Description

Compute the local size.

Author

Debojyoti Ghosh

Definition in file MPIPartition1D.c.

Function Documentation

int MPIPartition1D	(	int	nglobal,
		int	nproc,
		int	rank
	)

Given a 1D array of a given global size nglobal, and the total number of MPI ranks nproc on which it will be partitioned, this function computes the size of the local part of the 1D array on rank.

Parameters

nglobal	Global size
nproc	Total number of ranks
rank	Rank

Definition at line 14 of file MPIPartition1D.c.

{
  int nlocal;
  if (nglobal%nproc == 0) nlocal = nglobal/nproc;
  else {
    if (rank == nproc-1)  nlocal = nglobal/nproc + nglobal%nproc;
    else                  nlocal = nglobal/nproc;
  }
  return(nlocal);
}