Throw unimplemented.

[simgrid.git] / src / smpi / colls / bcast-flattree-pipeline.c

diff --git a/src/smpi/colls/bcast-flattree-pipeline.c b/src/smpi/colls/bcast-flattree-pipeline.c
index f01bbae..434b684 100644 (file)
--- a/src/smpi/colls/bcast-flattree-pipeline.c
+++ b/src/smpi/colls/bcast-flattree-pipeline.c
@@ -8,7 +8,7 @@ smpi_coll_tuned_bcast_flattree_pipeline(void *buff, int count,
                                         MPI_Comm comm)
 {
   int i, j, rank, num_procs;
-  int tag = 1;
+  int tag = COLL_TAG_BCAST;
 
   MPI_Aint extent;
   extent = smpi_datatype_get_extent(data_type);
@@ -16,7 +16,10 @@ smpi_coll_tuned_bcast_flattree_pipeline(void *buff, int count,
   int segment = flattree_segment_in_byte / extent;
   int pipe_length = count / segment;
   int increment = segment * extent;
-
+  if (pipe_length==0) {
+    XBT_WARN("MPI_bcast_flattree_pipeline use default MPI_bcast_flattree.");
+    return smpi_coll_tuned_bcast_flattree(buff, count, data_type, root, comm);
+  }
   rank = smpi_comm_rank(comm);
   num_procs = smpi_comm_size(comm);