X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/7f26d744d3e443d08cb485b543f30513f7da3469..56b8ebe99bfcd666e373069b2072291ab5e04ee8:/src/smpi/colls/alltoall-pair-mpi-barrier.c

diff --git a/src/smpi/colls/alltoall-pair-mpi-barrier.c b/src/smpi/colls/alltoall-pair-mpi-barrier.c
index 20dd573026..1816cff4d4 100644
--- a/src/smpi/colls/alltoall-pair-mpi-barrier.c
+++ b/src/smpi/colls/alltoall-pair-mpi-barrier.c
@@ -36,6 +36,10 @@ smpi_coll_tuned_alltoall_pair_mpi_barrier(void *send_buff, int send_count,
 
   rank = smpi_comm_rank(comm);
   num_procs = smpi_comm_size(comm);
+
+  if((num_procs&(num_procs-1)))
+    THROWF(arg_error,0, "alltoall 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);