Sage Weil <sage <at> newdream.net> writes: > > I just pushed out some "lazy io" patches to the unstable branches. Lazy > io is enabled on a file handle via a ceph ioctl (CEPH_IOC_LAZYIO). Once > that happens, an application can do buffered reads/writes even when a file > is open on multiple clients, and is responsible for managing it's own > cache conherency between nodes. > > An application can flush dirty data using sync_file_range(2), and > invalidate cached data using posix_fadvise(2) (POSIX_FADV_DONTNEED). > These are equivalent to the lazyio_propagate(2) and lazyio_synchronise(2) > in the original O_LAZY proposal from the POSIX IO group way back when. > > If anybody is interested in testing this functionality, let us know! > > sage > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo <at> vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Hi Sage, Im looking for use Parallel HDF5 on CEPH, and I expecting that Lazy IO can handle with Parallel IO on hdf file. I tried with ordinary CEPH although the parallel processes stuck. I guess that each process read or write operation will block until it is acknowledged by the OSD, right? How can I enable the Lazy IO on CEPH? There is some branch that I can get it? Regards Tiago -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
