[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.2a2-17-g230c2df

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http://git.mpich.org/mpich.git/commitdiff/230c2df337b4d450e84b39e9a2093aa33432b484

commit 230c2df337b4d450e84b39e9a2093aa33432b484
Author: Paul Coffman <pkcoff at us.ibm.com>
Date:   Mon Nov 24 21:29:58 2014 -0600

    romio gpfs: select correct read buffer
    
    ROMIO GPFSMPIO_P2PCONTIG threaded read needs to toggle first read buffer
    
    When using both the GPFSMPIO_P2PCONTIG and GPFSMPIO_PTHREADIO
    optimizations there was a correctness bug when reading where for the
    first round the read buffer did not toggle to the two-phase buffer for
    the pthread reader, resulting in diseminating the data from the wrong
    buffer.  The fix is to do the toggle after the first read.
    
    Signed-off-by: Paul Coffman <pkcoff at us.ibm.com>
    Signed-off-by: Rob Latham <robl at mcs.anl.gov>

diff --git a/src/mpi/romio/adio/common/p2p_aggregation.c b/src/mpi/romio/adio/common/p2p_aggregation.c
index c7c1800..292ba47 100644
--- a/src/mpi/romio/adio/common/p2p_aggregation.c
+++ b/src/mpi/romio/adio/common/p2p_aggregation.c
@@ -667,6 +667,7 @@ void ADIOI_P2PContigReadAggregation(ADIO_File fd,
 		ADIO_ReadContig(fd, read_buf,amountDataToReadThisRound,
 			MPI_BYTE, ADIO_EXPLICIT_OFFSET, currentRoundFDStart,
 			&status, error_code);
+        currentReadBuf = 1;
 
 #ifdef ROMIO_GPFS
 		endTimeBase = MPI_Wtime();

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

Summary of changes:
 src/mpi/romio/adio/common/p2p_aggregation.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)


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