protect (hopefully) collective communication algorithms from abuse.

[simgrid.git] / src / smpi / colls / allgather-3dmesh.c

diff --git a/src/smpi/colls/allgather-3dmesh.c b/src/smpi/colls/allgather-3dmesh.c
index 5a22437..c83fdc6 100644 (file)
--- a/src/smpi/colls/allgather-3dmesh.c
+++ b/src/smpi/colls/allgather-3dmesh.c
@@ -103,7 +103,9 @@ int smpi_coll_tuned_allgather_3dmesh(void *send_buff, int send_count,
   num_procs = smpi_comm_size(comm);
   extent = smpi_datatype_get_extent(send_type);
 
-  is_3dmesh(num_procs, &X, &Y, &Z);
+  if (!is_3dmesh(num_procs, &X, &Y, &Z))
+    THROWF(arg_error,0, "allgather_3dmesh algorithm can't be used with this number of processes! ");
+
 
   num_reqs = X;