Thanks Greg for theses informations! I'll try to build a test cluster soon. ----- Mail original ----- De: "Gregory Farnum" <greg@xxxxxxxxxxx> À: "Alexandre DERUMIER" <aderumier@xxxxxxxxx> Cc: "Milosz Tanski" <milosz@xxxxxxxxx>, "Andreas Joachim Peters" <Andreas.Joachim.Peters@xxxxxxx>, "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx> Envoyé: Lundi 23 Juin 2014 19:41:31 Objet: Re: CEPH IOPS Baseline Measurements with MemStore On Fri, Jun 20, 2014 at 12:41 AM, Alexandre DERUMIER <aderumier@xxxxxxxxx> wrote: > They are also a tracker here > http://tracker.ceph.com/issues/7191 > "Replace Mutex to RWLock with fdcache_lock in FileStore" > > seem to be done, but I'm not sure it's already is the master branch ? I believe this particular patch is still not merged (reviews etc on it and some related things are in progress), but some other pieces of the puzzle are in master (but not being backported to Firefly). In particular, we've enabled an "ms_fast_dispatch" mechanism which directly queues ops from the Pipe thread into the "OpWQ" (rather than going through a DispatchQueue priority queue first), and we've sharded the OpWQ. In progress but coming soonish are patches that should reduce the CPU cost of lfn_find and related FileStore calls, as well as sharding the fdcache lock (unless that one's merged already; I forget). And it turns out the "xattr spillout" patches to avoid doing so many LevelDB accesses were broken, and those are fixed in master (being backported to Firefly shortly). So there's a fair bit of work going on to address most all of those noted bottlenecks; if you're interested in it you probably want to run tests against master and try to track the conversations on the Tracker and ceph-devel. :) -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com -- 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
