[Darshan-users] no write information when using mvapich2

David Shrader dshrader at lanl.gov
Fri Jul 19 12:06:42 CDT 2013

Hello All,

I am currently trying to bring up a Darshan build that supports mvapich2 
1.7 and 1.8. The build seemingly completes without an issue, but I have 
noticed a problem when running an IO-replication application that we 
like to use: I am getting no stats in terms of writes. The app's general 
flow is to do a writing phase and then a reading phase to a single file 
(no collective operations except when opening the file). The stats for 
the reading phase are about what I expect. However, the stats for the 
writes are all 0. Specifically, CP_BYTES_WRITTEN and CP_POSIX_WRITES are 
both 0. The corresponding READS counters are where they should be.

I have tested this app (with the same run command) using a build of 
Darshan that works with Open MPI. There, the WRITE-related counters I 
mentioned above are where I expect them to be. It is just the mvapich2 
builds that have this behavior.

Did I miss something when building for mvapich2? Any ideas as to why 
write information might be missing? If it helps, I can send some of the 
output from darshan-parser (there is only a single file being written 
to, so the output isn't that large) or the log file itself.


David Shrader
1350 Central Ave
Suite 104
Los Alamos, NM 87544
David.Shrader at SICORP.com

LANL contact information:

LANL #: 505-664-0996
LANL email: dshrader at lanl.gov

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