--- /dev/null
+/* -*- Mode: C; -*- */
+/* Creator: Bronis R. de Supinski (bronis@llnl.gov) Fri Mar 17 2000 */
+/* no-error.c -- do some MPI calls without any errors */
+
+#include <stdio.h>
+#include "mpi.h"
+
+#define buf_size 128
+
+#define TWOD 2
+
+int
+main (int argc, char **argv)
+{
+ int nprocs = -1;
+ int rank = -1;
+ char processor_name[128];
+ int namelen = 128;
+ int buf0[buf_size];
+ int buf1[buf_size];
+ MPI_Status status;
+ MPI_Comm comm;
+ MPI_Group world_group, dgroup;
+ int *granks;
+ int dims[TWOD], periods[TWOD];
+ int drank, dnprocs;
+
+ /* init */
+ MPI_Init (&argc, &argv);
+ MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
+ MPI_Comm_rank (MPI_COMM_WORLD, &rank);
+ MPI_Get_processor_name (processor_name, &namelen);
+ printf ("(%d) is alive on %s\n", rank, processor_name);
+ fflush (stdout);
+
+ MPI_Barrier (MPI_COMM_WORLD);
+
+ if (nprocs < 4) {
+ printf ("not enough tasks\n");
+ }
+ else {
+ /* create a 2 X nprocs/2 torus topology, allow reordering */
+ dims[0] = 2;
+ dims[1] = nprocs/2;
+ periods[0] = periods[1] = 1;
+ MPI_Cart_create (MPI_COMM_WORLD, TWOD, dims, periods, 1, &comm);
+
+ if (comm != MPI_COMM_NULL) {
+ MPI_Comm_size (comm, &dnprocs);
+ MPI_Comm_rank (comm, &drank);
+
+ if (dnprocs > 1) {
+ if (drank == 0) {
+ memset (buf0, 0, buf_size);
+
+ MPI_Recv (buf1, buf_size, MPI_INT, 1, 0, comm, &status);
+
+ MPI_Send (buf0, buf_size, MPI_INT, 1, 0, comm);
+ }
+ else if (drank == 1) {
+ memset (buf1, 1, buf_size);
+
+ MPI_Recv (buf0, buf_size, MPI_INT, 0, 0, comm, &status);
+
+ MPI_Send (buf1, buf_size, MPI_INT, 0, 0, comm);
+ }
+ }
+ else {
+ printf ("(%d) Derived communicator too small (size = %d)\n",
+ rank, dnprocs);
+ }
+
+ MPI_Comm_free (&comm);
+ }
+ else {
+ printf ("(%d) Got MPI_COMM_NULL\n", rank);
+ }
+ }
+
+ MPI_Barrier (MPI_COMM_WORLD);
+
+ MPI_Finalize ();
+ printf ("(%d) Finished normally\n", rank);
+}
+
+/* EOF */