X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f3b7e5f4b4d7c87ee3e8827313ec966ea8fc8387..cfbf3bda3a828313326d322fa92fb6719904d1a4:/src/smpi/colls/smpi_default_selector.cpp

diff --git a/src/smpi/colls/smpi_default_selector.cpp b/src/smpi/colls/smpi_default_selector.cpp
index 64fdcf7175..03c7d542c7 100644
--- a/src/smpi/colls/smpi_default_selector.cpp
+++ b/src/smpi/colls/smpi_default_selector.cpp
@@ -1,6 +1,6 @@
 /* selector with default/naive Simgrid algorithms. These should not be trusted for performance evaluations */
 
-/* Copyright (c) 2009-2020. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2009-2021. 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. */
@@ -39,10 +39,20 @@ int reduce_scatter__default(const void *sendbuf, void *recvbuf, const int *recvc
   int size = comm->size();
   int count = 0;
   int* displs = new int[size];
+  int regular=1;
   for (int i = 0; i < size; i++) {
+    if(recvcounts[i]!=recvcounts[0]){
+      regular=0;
+      break;
+    }
     displs[i] = count;
     count += recvcounts[i];
   }
+  if(not regular){
+    delete[] displs;
+    return reduce_scatter__mpich(sendbuf, recvbuf, recvcounts, datatype, op, comm);
+  }
+
   unsigned char* tmpbuf = smpi_get_tmp_sendbuffer(count * datatype->get_extent());
 
   int ret = reduce__default(sendbuf, tmpbuf, count, datatype, op, 0, comm);