From 4c96d3eadaf5c03fae80c4f0b0a12907609aee11 Mon Sep 17 00:00:00 2001
From: Augustin Degomme <augustin.degomme@unibas.ch>
Date: Sat, 2 Sep 2017 23:51:53 +0200
Subject: [PATCH] check we don't allow 0 here

---
 teshsuite/smpi/coll-alltoallv/coll-alltoallv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/teshsuite/smpi/coll-alltoallv/coll-alltoallv.c b/teshsuite/smpi/coll-alltoallv/coll-alltoallv.c
index fced26e395..107179fe01 100644
--- a/teshsuite/smpi/coll-alltoallv/coll-alltoallv.c
+++ b/teshsuite/smpi/coll-alltoallv/coll-alltoallv.c
@@ -68,6 +68,10 @@ int main(int argc, char **argv)
 
   /* Create the buffer */
   MPI_Comm_size(comm, &size);
+  if(size<=0){
+    printf("error : comm size <= 0, run with mpirun\n");
+    return -1;
+  }
   MPI_Comm_rank(comm, &rank);
   int* sbuf = (int *) xbt_malloc(size * size * sizeof(int));
   int* rbuf = (int *) xbt_malloc(size * size * sizeof(int));
-- 
2.20.1