could you profile memory allocation of mds
http://docs.ceph.com/docs/mimic/rados/troubleshooting/memory-profiling/ On Tue, Jul 24, 2018 at 7:54 AM Daniel Carrasco <d.carra...@i2tic.com> wrote: > > Yeah, is also my thread. This thread was created before lower the cache size > from 512Mb to 8Mb. I thought that maybe was my fault and I did a > misconfiguration, so I've ignored the problem until now. > > Greetings! > > El mar., 24 jul. 2018 1:00, Gregory Farnum <gfar...@redhat.com> escribió: >> >> On Mon, Jul 23, 2018 at 11:08 AM Patrick Donnelly <pdonn...@redhat.com> >> wrote: >>> >>> On Mon, Jul 23, 2018 at 5:48 AM, Daniel Carrasco <d.carra...@i2tic.com> >>> wrote: >>> > Hi, thanks for your response. >>> > >>> > Clients are about 6, and 4 of them are the most of time on standby. Only >>> > two >>> > are active servers that are serving the webpage. Also we've a varnish on >>> > front, so are not getting all the load (below 30% in PHP is not much). >>> > About the MDS cache, now I've the mds_cache_memory_limit at 8Mb. >>> >>> What! Please post `ceph daemon mds.<name> config diff`, `... perf >>> dump`, and `... dump_mempools ` from the server the active MDS is on. >>> >>> > I've tested >>> > also 512Mb, but the CPU usage is the same and the MDS RAM usage grows up >>> > to >>> > 15GB (on a 16Gb server it starts to swap and all fails). With 8Mb, at >>> > least >>> > the memory usage is stable on less than 6Gb (now is using about 1GB of >>> > RAM). >>> >>> We've seen reports of possible memory leaks before and the potential >>> fixes for those were in 12.2.6. How fast does your MDS reach 15GB? >>> Your MDS cache size should be configured to 1-8GB (depending on your >>> preference) so it's disturbing to see you set it so low. >> >> >> See also the thread "[ceph-users] Fwd: MDS memory usage is very high", which >> had more discussion of that. The MDS daemon seemingly had 9.5GB of allocated >> RSS but only believed 489MB was in use for the cache... >> -Greg >> >>> >>> >>> -- >>> Patrick Donnelly >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
