[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.1b1-73-g5843db8

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Sat Sep 28 20:47:24 CDT 2013

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commit 5843db8395af2574ac43a9b063f5d8bff5abd748
Author: Pavan Balaji <balaji at mcs.anl.gov>
Date:   Sat Sep 28 15:57:49 2013 -0500

    Check for BUILTIN kinds, not just predefined datatypes.
    Some builtin kinds (e.g., MPI_DOUBLE_INT), can have extra padding when
    a vector of them is copied.  So we need to use the extent for such
    types, not just the size.  In this commit, we just simplify the
    optimization to only work on BUILTIN types, which do not have this
    Signed-off-by: Xin Zhao <xinzhao3 at illinois.edu>

diff --git a/src/mpi/coll/helper_fns.c b/src/mpi/coll/helper_fns.c
index e54b797..89fbcf3 100644
--- a/src/mpi/coll/helper_fns.c
+++ b/src/mpi/coll/helper_fns.c
@@ -75,8 +75,9 @@ int MPIR_Localcopy(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
         copy_sz = sdata_sz;
-    /* Predefined types is the common case; optimize for it */
+    /* Builtin types is the common case; optimize for it */
+    if ((HANDLE_GET_KIND(sendtype) == HANDLE_KIND_BUILTIN) &&
+        HANDLE_GET_KIND(recvtype) == HANDLE_KIND_BUILTIN) {
         MPIU_Memcpy(recvbuf, sendbuf, copy_sz);
         goto fn_exit;


Summary of changes:
 src/mpi/coll/helper_fns.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

MPICH primary repository

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