Hi Phil, Yeah.. I dont know nor can I comment on the recommended aspects of it since O_CREAT only means create if it does not exist. So we have to get it to work.. We had to workaround for our paper results by having only 1 process do the create. This used to work before and Sam's hunch is that letting concurrent create requests through the request-scheduler may have broken things.. Also, do not attempt to do simultaneous unlink() of the same file.. bad things happen with that as well..:( Thanks, Murali
> > > We just the MPI part for starting up a lot of processes.. Sorry for the > > incorrect phrasing in my emails. We dont use > > MPI I/O. Used the posix interface directly. > > > > Simultaneous create problems with vfs is possibly due to the request > > scheduler on server not serializing crdirents of the same component name. > > I doubt you will even see that kind of pattern at the server with the mpi > > i/o interface. > > Is this a bug that would show up if you have several VFS clients attempt > to open the same file in O_CREAT mode at the same time? > > I know that is not a recommended access pattern, but there are some > applications out there that do that. > > -Phil > > _______________________________________________ Pvfs2-developers mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers
