X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/1d18e615eaa617d3354bc22dfbe711d34be9f902..ec3e4ee5f1a7ffeb96e044057809944f364014e6:/src/smpi/colls/alltoallv-pair-light-barrier.c

diff --git a/src/smpi/colls/alltoallv-pair-light-barrier.c b/src/smpi/colls/alltoallv-pair-light-barrier.c
index 45a864b0c5..20deb834b6 100644
--- a/src/smpi/colls/alltoallv-pair-light-barrier.c
+++ b/src/smpi/colls/alltoallv-pair-light-barrier.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"
 /*****************************************************************************
 
@@ -31,7 +37,7 @@ smpi_coll_tuned_alltoallv_pair_light_barrier(void *send_buff, int *send_counts,
   MPI_Aint send_chunk, recv_chunk;
   MPI_Status s;
   int i, src, dst, rank, num_procs, next_partner;
-  int tag = 1;     /*, failure = 0; */
+  int tag = COLL_TAG_ALLTOALLV;     /*, failure = 0; */
 
   char send_sync = 'a', recv_sync = 'b';
   char *send_ptr = (char *) send_buff;
@@ -39,6 +45,10 @@ smpi_coll_tuned_alltoallv_pair_light_barrier(void *send_buff, int *send_counts,
 
   rank = smpi_comm_rank(comm);
   num_procs = smpi_comm_size(comm);
+
+  if((num_procs&(num_procs-1)))
+    THROWF(arg_error,0, "alltoallv pair algorithm can't be used with non power of two number of processes ! ");
+
   send_chunk = smpi_datatype_get_extent(send_type);
   recv_chunk = smpi_datatype_get_extent(recv_type);