Disregard my previous question. I found my answer in the post below. Absolutely brilliant! I thought I was screwed! http://permalink.gmane.org/gmane.comp.file-systems.ceph.devel/8924 Dave Spano Optogenics Systems Administrator ----- Original Message ----- From: "Dave Spano" <dspano@xxxxxxxxxxxxxx> To: "Sébastien Han" <han.sebastien@xxxxxxxxx> Cc: "Sage Weil" <sage@xxxxxxxxxxx>, "Wido den Hollander" <wido@xxxxxxxx>, "Gregory Farnum" <greg@xxxxxxxxxxx>, "Sylvain Munaut" <s.munaut@xxxxxxxxxxxxxxxxxxxx>, "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx>, "Samuel Just" <sam.just@xxxxxxxxxxx>, "Vladislav Gorbunov" <vadikgo@xxxxxxxxx> Sent: Tuesday, March 12, 2013 1:41:21 PM Subject: Re: OSD memory leaks? If one were stupid enough to have their pg_num and pgp_num set to 8 on two of their pools, how could you fix that? Dave Spano ----- Original Message ----- From: "Sébastien Han" <han.sebastien@xxxxxxxxx> To: "Vladislav Gorbunov" <vadikgo@xxxxxxxxx> Cc: "Sage Weil" <sage@xxxxxxxxxxx>, "Wido den Hollander" <wido@xxxxxxxx>, "Gregory Farnum" <greg@xxxxxxxxxxx>, "Sylvain Munaut" <s.munaut@xxxxxxxxxxxxxxxxxxxx>, "Dave Spano" <dspano@xxxxxxxxxxxxxx>, "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx>, "Samuel Just" <sam.just@xxxxxxxxxxx> Sent: Tuesday, March 12, 2013 9:43:44 AM Subject: Re: OSD memory leaks? >Sorry, i mean pg_num and pgp_num on all pools. Shown by the "ceph osd >dump | grep 'rep size'" Well it's still 450 each... >The default pg_num value 8 is NOT suitable for big cluster. Thanks I know, I'm not new with Ceph. What's your point here? I already said that pg_num was 450... -- Regards, Sébastien Han. On Tue, Mar 12, 2013 at 2:00 PM, Vladislav Gorbunov <vadikgo@xxxxxxxxx> wrote: > Sorry, i mean pg_num and pgp_num on all pools. Shown by the "ceph osd > dump | grep 'rep size'" > The default pg_num value 8 is NOT suitable for big cluster. > > 2013/3/13 Sébastien Han <han.sebastien@xxxxxxxxx>: >> Replica count has been set to 2. >> >> Why? >> -- >> Regards, >> Sébastien Han. >> >> >> On Tue, Mar 12, 2013 at 12:45 PM, Vladislav Gorbunov <vadikgo@xxxxxxxxx> wrote: >>>> FYI I'm using 450 pgs for my pools. >>> Please, can you show the number of object replicas? >>> >>> ceph osd dump | grep 'rep size' >>> >>> Vlad Gorbunov >>> >>> 2013/3/5 Sébastien Han <han.sebastien@xxxxxxxxx>: >>>> FYI I'm using 450 pgs for my pools. >>>> >>>> -- >>>> Regards, >>>> Sébastien Han. >>>> >>>> >>>> On Fri, Mar 1, 2013 at 8:10 PM, Sage Weil <sage@xxxxxxxxxxx> wrote: >>>>> >>>>> On Fri, 1 Mar 2013, Wido den Hollander wrote: >>>>> > On 02/23/2013 01:44 AM, Sage Weil wrote: >>>>> > > On Fri, 22 Feb 2013, S?bastien Han wrote: >>>>> > > > Hi all, >>>>> > > > >>>>> > > > I finally got a core dump. >>>>> > > > >>>>> > > > I did it with a kill -SEGV on the OSD process. >>>>> > > > >>>>> > > > https://www.dropbox.com/s/ahv6hm0ipnak5rf/core-ceph-osd-11-0-0-20100-1361539008 >>>>> > > > >>>>> > > > Hope we will get something out of it :-). >>>>> > > >>>>> > > AHA! We have a theory. The pg log isnt trimmed during scrub (because teh >>>>> > > old scrub code required that), but the new (deep) scrub can take a very >>>>> > > long time, which means the pg log will eat ram in the meantime.. >>>>> > > especially under high iops. >>>>> > > >>>>> > >>>>> > Does the number of PGs influence the memory leak? So my theory is that when >>>>> > you have a high number of PGs with a low number of objects per PG you don't >>>>> > see the memory leak. >>>>> > >>>>> > I saw the memory leak on a RBD system where a pool had just 8 PGs, but after >>>>> > going to 1024 PGs in a new pool it seemed to be resolved. >>>>> > >>>>> > I've asked somebody else to try your patch since he's still seeing it on his >>>>> > systems. Hopefully that gives us some results. >>>>> >>>>> The PGs were active+clean when you saw the leak? There is a problem (that >>>>> we just fixed in master) where pg logs aren't trimmed for degraded PGs. >>>>> >>>>> sage >>>>> >>>>> > >>>>> > Wido >>>>> > >>>>> > > Can you try wip-osd-log-trim (which is bobtail + a simple patch) and see >>>>> > > if that seems to work? Note that that patch shouldn't be run in a mixed >>>>> > > argonaut+bobtail cluster, since it isn't properly checking if the scrub is >>>>> > > class or chunky/deep. >>>>> > > >>>>> > > Thanks! >>>>> > > sage >>>>> > > >>>>> > > >>>>> > > > -- >>>>> > > > Regards, >>>>> > > > S?bastien Han. >>>>> > > > >>>>> > > > >>>>> > > > On Fri, Jan 11, 2013 at 7:13 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote: >>>>> > > > > On Fri, Jan 11, 2013 at 6:57 AM, S?bastien Han <han.sebastien@xxxxxxxxx> >>>>> > > > > wrote: >>>>> > > > > > > Is osd.1 using the heap profiler as well? Keep in mind that active >>>>> > > > > > > use >>>>> > > > > > > of the memory profiler will itself cause memory usage to increase ? >>>>> > > > > > > this sounds a bit like that to me since it's staying stable at a >>>>> > > > > > > large >>>>> > > > > > > but finite portion of total memory. >>>>> > > > > > >>>>> > > > > > Well, the memory consumption was already high before the profiler was >>>>> > > > > > started. So yes with the memory profiler enable an OSD might consume >>>>> > > > > > more memory but this doesn't cause the memory leaks. >>>>> > > > > >>>>> > > > > My concern is that maybe you saw a leak but when you restarted with >>>>> > > > > the memory profiling you lost whatever conditions caused it. >>>>> > > > > >>>>> > > > > > Any ideas? Nothing to say about my scrumbing theory? >>>>> > > > > I like it, but Sam indicates that without some heap dumps which >>>>> > > > > capture the actual leak then scrub is too large to effectively code >>>>> > > > > review for leaks. :( >>>>> > > > > -Greg >>>>> > > > -- >>>>> > > > 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 >>>>> > > > >>>>> > > > >>>>> > > -- >>>>> > > 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 >>>>> > > >>>>> > >>>>> > >>>>> > -- >>>>> > Wido den Hollander >>>>> > 42on B.V. >>>>> > >>>>> > Phone: +31 (0)20 700 9902 >>>>> > Skype: contact42on >>>>> > >>>>> > >>>> -- >>>> 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 -- 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
