Hi, 1. Agree (our item in the pad). We have prototyped something that works for us, but some work might be needed to make it useful upstream. 2. Accelio/XioMessenger does well on the front side. It will be interesting to compare notes. Matt ----- "Haomai Wang" <haomaiwang@xxxxxxxxx> wrote: > Thanks for sage! > > I'm on the flight at Oct 1. :-( > > Now my team is mainly worked on the performance of ceph, we have > observed these points: > > 1. encode/decode plays remarkable latency, especially in > ObjectStore::Transaction. I'm urgen in refactor ObjectStore API to > avoid encode/decode codes. It seemed has be signed in note(- remove > serialization from ObjectStore::Transaction (ymmv)) > 2. obvious latency for threadpool/workqueue model. Do we consider to > impl performance optimization workqueue to replace existing critical > workqueue such as op_wq in OSD.h and op_wq in FileStore.h. Now in my > AsyncMessenger impl, I will try to use custom and simple workqueue > impl to improve performance. > 3. Large lock in client library such as ObjectCacher > > > On Fri, Sep 26, 2014 at 2:27 AM, Sage Weil <sweil@xxxxxxxxxx> wrote: > > Hi everyone, > > > > A number of people have approached me about how to get more involved > with > > the current work on improving performance and how to better > coordinate > > with other interested parties. A few meetings have taken place > offline > > with good results but only a few interested parties were involved. > > > > Ideally, we'd like to move as much of this dicussion into the > public > > forums: ceph-devel@xxxxxxxxxxxxxxx and #ceph-devel. That isn't > always > > sufficient, however. I'd like to also set up a regular weekly > meeting > > using google hangouts or bluejeans so that all interested parties > can > > share progress. There are a lot of things we can do during the > Hammer > > cycle to improve things but it will require some coordination of > effort. > > > > Among other things, we can discuss: > > > > - observed performance limitations > > - high level strategies for addressing them > > - proposed patch sets and their performance impact > > - anything else that will move us forward > > > > One challenge is timezones: there are developers in the US, China, > Europe, > > and Israel who may want to join. As a starting point, how about > next > > Wednesday, 15:00 UTC? If I didn't do my tz math wrong, that's > > > > 8:00 (PDT, California) > > 15:00 (UTC) > > 18:00 (IDT, Israel) > > 23:00 (CST, China) > > > > That is surely not the ideal time for everyone but it can hopefully > be a > > starting point. > > > > I've also created an etherpad for collecting discussion/agenda items > at > > > > http://pad.ceph.com/p/performance_weekly > > > > Is there interest here? Please let everyone know if you are > actively > > working in this area and/or would like to join, and update the pad > above > > with the topics you would like to discuss. > > > > Thanks! > > sage > > > > -- > Best Regards, > > Wheat > -- > 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 -- Matt Benjamin The Linux Box 206 South Fifth Ave. Suite 150 Ann Arbor, MI 48104 http://linuxbox.com tel. 734-761-4689 fax. 734-769-8938 cel. 734-216-5309 -- 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
