X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/6c21a15a8a77f76d55fe77ef0d1225bb083d0a40..1c5d13f7fed995154113e221cf139317323637cd:/teshsuite/smpi/topo-cart-sub/topo-cart-sub.c

diff --git a/teshsuite/smpi/topo-cart-sub/topo-cart-sub.c b/teshsuite/smpi/topo-cart-sub/topo-cart-sub.c
new file mode 100644
index 0000000000..fc64b7dcbc
--- /dev/null
+++ b/teshsuite/smpi/topo-cart-sub/topo-cart-sub.c
@@ -0,0 +1,117 @@
+/* Copyright (c) 2019. Jonathan Borne.
+*/
+/* Copyright (c) 2009-2019. The SimGrid Team.
+ * All rights reserved.                                                     */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <mpi.h>
+
+#define DIM 2
+#define Q 2
+/* Where DIM is the dimension of the Grid (2D) */
+/* and Q is the number of processes per dimension */
+#define N 3
+/* Local matrices size N*N */
+
+int main(int argc, char **argv){
+    /* Nb of nodes in the grid:
+       initialized by MPI_Comm_size according to commandline -np value */
+    int nbNodes;
+
+    /* Communicators */
+    MPI_Comm gridComm, lineComm;
+    /* Current process ranks */
+    int rank, gridSize, myGridRank, myLineRank, myColRank;
+    /* coords: used to get myLineRank and myColRank
+       initialized by MPI_Cart_coords
+     */
+    int coords[DIM];
+    /* dims: Integer array of size ndims specifying the number
+       of processes in each dimension.
+       if init value is 0 it is reset by MPI_Dims_create.
+    */
+    int dims[DIM];
+    for(int i=0; i<DIM; i++){
+        dims[i] = Q;
+    }
+    /* periods:
+       Logical array of size ndims specifying whether the grid is
+       periodic (true) or not (false) in each dimension. */
+    int periods[DIM];
+    for(int i=0; i<DIM; i++){
+        periods[i] = 1;
+    }
+    /* reorder: do not allows rank reordering when creating the grid comm */
+    int reorder = 0;
+    /* remainDims[]: used to set which dimension is kept in subcommunicators */
+    int remainDim[DIM];
+
+    /* Local Matrix */
+    int *A = (int *)malloc(N * N * sizeof(int));
+
+    /* Init */
+    MPI_Init(&argc, &argv);
+    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+    MPI_Comm_size(MPI_COMM_WORLD, &nbNodes);
+
+    printf("rank %d: Alive \n", rank);
+
+    MPI_Barrier(MPI_COMM_WORLD);
+
+    /* Set dims[] values to descibe a grid of nbNodes and DIM dimensions*/
+    MPI_Cart_create(MPI_COMM_WORLD, DIM, dims, periods, reorder,
+                    &gridComm);
+
+    if(gridComm == MPI_COMM_NULL) printf("error grid NULLCOMM \n");
+
+    MPI_Comm_rank(gridComm, &myGridRank);
+    MPI_Comm_size(gridComm, &gridSize);
+    MPI_Cart_coords(gridComm, myGridRank, DIM, coords);
+    myLineRank = coords[0];
+    myColRank = coords[1];
+
+    MPI_Barrier(MPI_COMM_WORLD);
+
+    /* Create a line communicator for current process */
+    remainDim[0] = 0;
+    remainDim[1] = 1;
+    MPI_Cart_sub(gridComm, remainDim , &lineComm);
+
+    /* Check if lineComm was initialized */
+    if(lineComm == MPI_COMM_NULL) printf("(%d,%d): ERR (lineComm == NULLCOMM)\n",
+                                         myLineRank, myColRank);
+
+    /* A Initialization */
+    for(int i=0; i<N; i++){
+        for(int j=0; j<N; j++){
+            *(A + (i*N) + j) = i==j?rank:0;
+        }
+    }
+
+    MPI_Barrier(MPI_COMM_WORLD);
+
+    /* Broadcast */
+    int root = 0;
+    MPI_Bcast(A, N*N, MPI_INT, root, lineComm);
+
+    /* Print A */
+    printf("process:(%d,%d) \n", myLineRank,
+           myColRank);
+
+    printf("-------------------\n");
+    for(int i=0; i<N; i++){
+        for(int j=0; j<N; j++){
+            printf("%d ", *(A + (i*N) + j));
+        }
+        printf("\n");
+    }
+    printf("-------------------\n");
+    free(A);
+    MPI_Barrier (MPI_COMM_WORLD);
+    MPI_Finalize();
+    return 0;
+}