nixpkgs/nixos/tests/mpich-example.c

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#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
int
main (int argc, char *argv[])
{
int rank, size, length;
char name[BUFSIZ];
MPI_Init (&argc, &argv);
MPI_Comm_rank (MPI_COMM_WORLD, &rank);
MPI_Comm_size (MPI_COMM_WORLD, &size);
MPI_Get_processor_name (name, &length);
printf ("%s: hello world from process %d of %d\n", name, rank, size);
MPI_Finalize ();
return EXIT_SUCCESS;
}