X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/12c0f182635ed71b370d608b5b9a614153765cd4..22ad42bc0e39c33058fa8f47d3b41966a45ffa80:/src/smpi/colls/allgatherv-pair.c

diff --git a/src/smpi/colls/allgatherv-pair.c b/src/smpi/colls/allgatherv-pair.c
index d60e77a5ff..b6eea73379 100644
--- a/src/smpi/colls/allgatherv-pair.c
+++ b/src/smpi/colls/allgatherv-pair.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"
 
 /*****************************************************************************
@@ -66,15 +72,19 @@ smpi_coll_tuned_allgatherv_pair(void *send_buff, int send_count,
 {
 
   MPI_Aint extent;
-  int i, src, dst, rank, num_procs;
-  int tag = 1;
+  unsigned int i, src, dst;
+  int tag = COLL_TAG_ALLGATHERV;
   MPI_Status status;
 
   char *send_ptr = (char *) send_buff;
   char *recv_ptr = (char *) recv_buff;
 
-  rank = smpi_comm_rank(comm);
-  num_procs = smpi_comm_size(comm);
+  unsigned int rank = smpi_comm_rank(comm);
+  unsigned int num_procs = smpi_comm_size(comm);
+
+  if((num_procs&(num_procs-1)))
+    THROWF(arg_error,0, "allgatherv pair algorithm can't be used with non power of two number of processes ! ");
+
   extent = smpi_datatype_get_extent(send_type);
 
   // local send/recv