X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f070773e633fc07bb6be25b23b7ded7657479e7f..954676b700e711f38ec4d286d33d5427d3f4ca46:/src/smpi/colls/allgather-2dmesh.c

diff --git a/src/smpi/colls/allgather-2dmesh.c b/src/smpi/colls/allgather-2dmesh.c
index b5f50420e0..6bec72d967 100644
--- a/src/smpi/colls/allgather-2dmesh.c
+++ b/src/smpi/colls/allgather-2dmesh.c
@@ -1,3 +1,9 @@
+/* Copyright (c) 2013-2014. 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 "colls_private.h"
 
 /*****************************************************************************
@@ -110,7 +116,7 @@ smpi_coll_tuned_allgather_2dmesh(void *send_buff, int send_count, MPI_Datatype
   int i, src, dst, rank, num_procs;
   int X, Y, send_offset, recv_offset;
   int my_row_base, my_col_base, src_row_base, block_size, num_reqs;
-  int tag = 1;
+  int tag = COLL_TAG_ALLGATHER;
 
   rank = smpi_comm_rank(comm);
   num_procs = smpi_comm_size(comm);
@@ -119,7 +125,9 @@ smpi_coll_tuned_allgather_2dmesh(void *send_buff, int send_count, MPI_Datatype
 
   block_size = extent * send_count;
 
-  is_2dmesh(num_procs, &X, &Y);
+  if (!is_2dmesh(num_procs, &X, &Y))
+    THROWF(arg_error,0, "allgather_2dmesh algorithm can't be used with this number of processes! ");
+
   my_row_base = (rank / Y) * Y;
   my_col_base = rank % Y;