On Mar 7, 2010, at 2:55 AM, Gijsbert Wiesenekker wrote: > I was having non-reproducible hangs in an OpenMPI program. While > troubleshooting this problem I found that there were many temporary > directories in my /tmp/openmpi-sessions-userid directory (probably the result > of MPI_Abort aborted OpenMPI programs). I cleaned those directories up and it > looks like the hangs have gone. > My questions are: > It looks like the name of the temporary directory in > /tmp/openmpi-sessions-userid directory is a process-id. What happens when an > OpenMPI program starts and the temporary directory in > /tmp/openmpi-sessions-userid already exists?
It'll just overwrite what is already there. I confess that the code has not been tested for that situation, though, so I can't guarantee that response. > Could existing temporary directories in /tmp/openmpi-sessions-userid cause an > OpenMPI program to hang? Given your observations, I guess the answer has to be "yes", though I wouldn't have expected it. The typical behavior in this scenario is for the application to error out during MPI_Init when it finds that there isn't enough space in /tmp for the session directory - and that is caused not by the directory itself, but rather by the shared memory backing file that resides in the session dir tree and can be quite large. > Is there a way to ensure that the temporary directory created in > /tmp/openmpi-sessions-userid is always removed after an OpenMPI program has > run? It really, really helps to know what version you are using. We just found a bug in the 1.3/1.4 series that was causing the apps not to cleanup in exactly this scenario - that is fixed in the upcoming 1.4.2 release. The older 1.2 series had this problem as well, but we aren't going back to fix it. :-) > > Regards, > Gijsbert > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
