X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/89e44dce958ad9625570b126f11d299b829d4932..a8b5faafecff77b1540810d84fc0b387f85952a5:/src/smpi/colls/allreduce-rab1.c

diff --git a/src/smpi/colls/allreduce-rab1.c b/src/smpi/colls/allreduce-rab1.c
index ae72f7491a..2e80e45f6f 100644
--- a/src/smpi/colls/allreduce-rab1.c
+++ b/src/smpi/colls/allreduce-rab1.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"
 //#include <star-reduction.c>
 
@@ -8,7 +14,7 @@ int smpi_coll_tuned_allreduce_rab1(void *sbuff, void *rbuff,
 {
   MPI_Status status;
   MPI_Aint extent;
-  int tag = 4321, rank, nprocs, send_size, newcnt, share;
+  int tag = COLL_TAG_ALLREDUCE, rank, nprocs, send_size, newcnt, share;
   int pof2 = 1, mask, send_idx, recv_idx, dst, send_cnt, recv_cnt;
 
   void *recv, *tmp_buf;
@@ -16,6 +22,9 @@ int smpi_coll_tuned_allreduce_rab1(void *sbuff, void *rbuff,
   rank = smpi_comm_rank(comm);
   nprocs = smpi_comm_size(comm);
 
+  if((nprocs&(nprocs-1)))
+    THROWF(arg_error,0, "allreduce rab1 algorithm can't be used with non power of two number of processes ! ");
+
   extent = smpi_datatype_get_extent(dtype);
 
   pof2 = 1;