X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/0e9c0448c6566825b170b98ecff716b098bda10e..3ec2b07053bb1769b1aa337a076ed76adf2d5d36:/src/smpi/colls/alltoallv-pair-one-barrier.c

diff --git a/src/smpi/colls/alltoallv-pair-one-barrier.c b/src/smpi/colls/alltoallv-pair-one-barrier.c
index 7bea7e7171..7227df81fb 100644
--- a/src/smpi/colls/alltoallv-pair-one-barrier.c
+++ b/src/smpi/colls/alltoallv-pair-one-barrier.c
@@ -36,6 +36,10 @@ smpi_coll_tuned_alltoallv_pair_one_barrier(void *send_buff, int *send_counts, in
 
   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);