[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.2-2-g538f8ab

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http://git.mpich.org/mpich.git/commitdiff/538f8abb47d47dd3bb39e648e771ac705b2bf274

commit 538f8abb47d47dd3bb39e648e771ac705b2bf274
Author: Rob Latham <robl at mcs.anl.gov>
Date:   Wed Nov 11 13:45:29 2015 -0600

    avoid rare but possible divide-by-zero
    
    Signed-off-by: Halim Amer <aamer at anl.gov>

diff --git a/src/mpi/romio/adio/ad_lustre/ad_lustre_aggregate.c b/src/mpi/romio/adio/ad_lustre/ad_lustre_aggregate.c
index cd55282..da54d71 100644
--- a/src/mpi/romio/adio/ad_lustre/ad_lustre_aggregate.c
+++ b/src/mpi/romio/adio/ad_lustre/ad_lustre_aggregate.c
@@ -310,8 +310,13 @@ int ADIOI_LUSTRE_Docollect(ADIO_File fd, int contig_access_count,
                fd->comm);
     MPI_Allreduce(&contig_access_count, &total_access_count, 1, MPI_INT, MPI_SUM,
                fd->comm);
-    /* estimate average req_size */
-    avg_req_size = (int)(total_req_size / total_access_count);
+    /* avoid possible divide-by-zero) */
+    if (total_access_count != 0) {
+	/* estimate average req_size */
+	avg_req_size = (int)(total_req_size / total_access_count);
+    } else {
+	avg_req_size = 0;
+    }
     /* get hint of big_req_size */
     big_req_size = fd->hints->fs_hints.lustre.coll_threshold;
     /* Don't perform collective I/O if there are big requests */

-----------------------------------------------------------------------

Summary of changes:
 src/mpi/romio/adio/ad_lustre/ad_lustre_aggregate.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)


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