On Wed, May 4, 2016 at 2:16 AM, Yan, Zheng <ukernel@xxxxxxxxx> wrote: > On Wed, May 4, 2016 at 4:51 PM, Burkhard Linke > <Burkhard.Linke@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: >> Hi, >> >> >> How does CephFS handle locking in case of missing explicit locking control >> (e.g. flock / fcntl)? And what's the default of mmap'ed memory access in >> that case? >> > > Nothing special. Actually, I have no idea why using flock improves > performance. Could you please enable debug and send the log to use. Okay, so it sounds like this isn't so much flock file locking as you added a syscall telling it not to worry about synchronization, and now you want a way to disable our consistency semantics on <some subset of files>. Exactly what change did you make to your application, can you share the key syscall? Programmatically you can use the lazyIO flags we have, but I can't offhand think of anything you can specify per-mount or similar. That's an interesting request, hmm.... Zheng, Sage, any thoughts? -Greg > > run following commands while your application (without flock) is > running and send the log to us. > > ceph daemon client.xxx config set debug_client 20 > sleep 30 > ceph daemon client.xxx config set debug_client 0 > > > > > >> >> Regards, >> Burkhard >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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