"Latham, Robert J." <r...@mcs.anl.gov> writes: > it's hard to implement fcntl-lock-free versions of Atomic mode and > Shared file pointer so file systems like PVFS don't support those modes > (and return an error indicating such at open time).
Ah. For some reason I thought PVFS had the support to pass the tests somehow, but it's been quite a while since I used it. > You can run lock-free for noncontiguous writes, though at a significant > performance cost. In ROMIO we can disable data sieving write by > setting the hint "romio_ds_write" to "disable", which will fall back to > piece-wise operations. Could be OK if you know your noncontiguous > accesses are only a little bit noncontiguous. Does that mean it could actually support more operations (without failing due to missing flock)? Of course, I realize one should just use flock mounts with Lustre, as I used to. I don't remember this stuff being written down explicitly anywhere, though -- is it somewhere? Thanks for the info. _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
