X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/1d18e615eaa617d3354bc22dfbe711d34be9f902..954676b700e711f38ec4d286d33d5427d3f4ca46:/src/smpi/colls/allgather-rhv.c

diff --git a/src/smpi/colls/allgather-rhv.c b/src/smpi/colls/allgather-rhv.c
index c3db821070..c2e0cb43ff 100644
--- a/src/smpi/colls/allgather-rhv.c
+++ b/src/smpi/colls/allgather-rhv.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"
 
 // now only work with power of two processes
@@ -15,12 +21,16 @@ smpi_coll_tuned_allgather_rhv(void *sbuf, int send_count,
   int i, dst, send_base_offset, recv_base_offset, send_chunk, recv_chunk,
       send_offset, recv_offset;
   int rank, num_procs;
-  int tag = 50;
+  int tag = COLL_TAG_ALLGATHER;
   int mask;
   int curr_count;
 
   // get size of the communicator, followed by rank 
   num_procs = smpi_comm_size(comm);
+
+  if((num_procs&(num_procs-1)))
+    THROWF(arg_error,0, "allgather rhv algorithm can't be used with non power of two number of processes ! ");
+
   rank = smpi_comm_rank(comm);
 
   // get size of single element's type for send buffer and recv buffer