X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/12c0f182635ed71b370d608b5b9a614153765cd4..cd9affe6152d6bbec19a72ea6fe26ab9407b51b7:/src/smpi/colls/alltoallv-pair-mpi-barrier.c

diff --git a/src/smpi/colls/alltoallv-pair-mpi-barrier.c b/src/smpi/colls/alltoallv-pair-mpi-barrier.c
index 9944493844..b5b05e803b 100644
--- a/src/smpi/colls/alltoallv-pair-mpi-barrier.c
+++ b/src/smpi/colls/alltoallv-pair-mpi-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"
 /*****************************************************************************
 
@@ -30,12 +36,16 @@ smpi_coll_tuned_alltoallv_pair_mpi_barrier(void *send_buff, int *send_counts, in
   MPI_Status s;
   MPI_Aint send_chunk, recv_chunk;
   int i, src, dst, rank, num_procs;
-  int tag = 101;
+  int tag = COLL_TAG_ALLTOALLV;
   char *send_ptr = (char *) send_buff;
   char *recv_ptr = (char *) recv_buff;
 
   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);