--- /dev/null
+/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
+/*
+ *
+ * (C) 2003 by Argonne National Laboratory.
+ * See COPYRIGHT in top-level directory.
+ */
+#include "mpi.h"
+#include <stdio.h>
+#include "mpitest.h"
+
+int main( int argc, char *argv[] )
+{
+ int errs = 0;
+ int size, rank;
+ int source, dest;
+ int dims[2], periods[2];
+ MPI_Comm comm;
+
+ MTest_Init( &argc, &argv );
+
+ MPI_Comm_size( MPI_COMM_WORLD, &size );
+ MPI_Comm_rank( MPI_COMM_WORLD, &rank );
+ dims[0] = size;
+ periods[0] = 1;
+ MPI_Cart_create( MPI_COMM_WORLD, 1, dims, periods, 0, &comm );
+ MPI_Cart_shift( comm, 0, 1, &source, &dest );
+ if (source != ((rank - 1 + size) % size)) {
+ errs++;
+ printf( "source for shift 1 is %d\n", source );
+ }
+ if (dest != ((rank + 1) % size)) {
+ errs++;
+ printf( "dest for shift 1 is %d\n", dest );
+ }
+ MPI_Cart_shift( comm, 0, 0, &source, &dest );
+ if (source != rank) {
+ errs++;
+ printf( "Source for shift 0 is %d\n", source );
+ }
+ if (dest != rank) {
+ errs++;
+ printf( "Dest for shift 0 is %d\n", dest );
+ }
+ MPI_Cart_shift( comm, 0, -1, &source, &dest );
+ if (source != ((rank + 1) % size)) {
+ errs++;
+ printf( "source for shift -1 is %d\n", source );
+ }
+ if (dest != ((rank - 1 + size) % size)) {
+ errs++;
+ printf( "dest for shift -1 is %d\n", dest );
+ }
+
+ /* Now, with non-periodic */
+ MPI_Comm_free( &comm );
+ periods[0] = 0;
+ MPI_Cart_create( MPI_COMM_WORLD, 1, dims, periods, 0, &comm );
+ MPI_Cart_shift( comm, 0, 1, &source, &dest );
+ if ((rank > 0 && source != (rank - 1)) ||
+ (rank == 0 && source != MPI_PROC_NULL)) {
+ errs++;
+ printf( "source for non-periodic shift 1 is %d\n", source );
+ }
+ if ((rank < size-1 && dest != rank + 1) ||
+ ((rank == size-1) && dest != MPI_PROC_NULL)) {
+ errs++;
+ printf( "dest for non-periodic shift 1 is %d\n", dest );
+ }
+ MPI_Cart_shift( comm, 0, 0, &source, &dest );
+ if (source != rank) {
+ errs++;
+ printf( "Source for non-periodic shift 0 is %d\n", source );
+ }
+ if (dest != rank) {
+ errs++;
+ printf( "Dest for non-periodic shift 0 is %d\n", dest );
+ }
+ MPI_Cart_shift( comm, 0, -1, &source, &dest );
+ if ((rank < size - 1 && source != rank + 1) ||
+ (rank == size - 1 && source != MPI_PROC_NULL)) {
+
+ errs++;
+ printf( "source for non-periodic shift -1 is %d\n", source );
+ }
+ if ((rank > 0 && dest != rank - 1) ||
+ (rank == 0 && dest != MPI_PROC_NULL)) {
+ errs++;
+ printf( "dest for non-periodic shift -1 is %d\n", dest );
+ }
+ MPI_Comm_free( &comm );
+
+ MTest_Finalize( errs );
+ MPI_Finalize();
+ return 0;
+
+}