Some detail optimization points:
1. FileStore/KeyValueStore worker threads will complete with a global
object("meta" collection, "infos" oid) which is used only by omap_*
methods. (https://github.com/ceph/ceph/pull/2502)
2. Sparse recovery when using fiemap(https://github.com/ceph/ceph/pull/2137)
On Fri, Sep 26, 2014 at 10:27 AM, Haomai Wang <haomaiw...@gmail.com> 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 <sw...@redhat.com> 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@vger.kernel.org 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
--
Best Regards,
Wheat
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