[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.1b1-38-gb539c5a

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http://git.mpich.org/mpich.git/commitdiff/b539c5a1765a1f03ef5e847b95180ca64c5a6c48

commit b539c5a1765a1f03ef5e847b95180ca64c5a6c48
Author: Rob Latham <robl at mcs.anl.gov>
Date:   Wed Sep 18 10:52:00 2013 -0500

    Maintain requested perms in more cases
    
    If data sieving is not supported by the underlying file system (e.g. PVFS,
    PLFS, BGLOCKLESS) then there is no reason to turn write-only requests
    into read-write requests.  Suggestion first reported by David Knaak of Cray.
    
    Reviewed-by: David Knaak <knaak at cray.com>

diff --git a/src/mpi/romio/adio/common/ad_opencoll.c b/src/mpi/romio/adio/common/ad_opencoll.c
index 235bd78..2bea36e 100644
--- a/src/mpi/romio/adio/common/ad_opencoll.c
+++ b/src/mpi/romio/adio/common/ad_opencoll.c
@@ -79,8 +79,12 @@ void ADIOI_GEN_OpenColl(ADIO_File fd, int rank,
    if write_only, open the file as read_write, but record it as write_only
    in fd, so that get_amode returns the right answer. */
 
+    /* observation from David Knaak: file systems that do not support data
+     * sieving do not need to change the mode */
+
     orig_amode_wronly = access_mode;
-    if (access_mode & ADIO_WRONLY) {
+    if ( (access_mode & ADIO_WRONLY) &&
+	    ADIO_Feature(fd, ADIO_DATA_SIEVING_WRITES) ) {
 	access_mode = access_mode ^ ADIO_WRONLY;
 	access_mode = access_mode | ADIO_RDWR;
     }

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

Summary of changes:
 src/mpi/romio/adio/common/ad_opencoll.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)


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