"Gabriel, Edgar" <egabr...@central.uh.edu> writes: > It was originally for performance reasons, but this should be fixed at > this point. I am not aware of correctness problems. > > However, let me try to clarify your question about: What do you > precisely mean by "MPI I/O on Lustre mounts without flock"? Was the > Lustre filesystem mounted without flock?
No, it wasn't (and romio complains). > If yes, that could lead to > some problems, we had that on our Lustre installation for a while, but > problems were even occurring without MPI I/O in that case (although I > do not recall all details, just that we had to change the mount > options). Yes, without at least localflock you might expect problems with things like bdb and sqlite, but I couldn't see any file locking calls in the Lustre component. If it is a problem, shouldn't the component fail like without it like romio does? I have suggested ephemeral PVFS^WOrangeFS but I doubt that will be thought useful. > Maybe just take a testsuite (either ours or HDF5), make sure > to run it in a multi-node configuration and see whether it works > correctly. For some reason I didn't think MTT, if that's what you mean, was available, but I see it is; I'll see if I can drive it when I have a chance. Tests from HDF5 might be easiest, thanks for the suggestion. I'd tried with ANL's "testmpio", which was the only thing I found immediately, but it threw up errors even on a local filesystem, at which stage I thought it was best to ask... I'll report back if I get useful results. _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
