On 10/11/2018 12:08 AM, Wido den Hollander wrote: > Hi, > > On a Luminous cluster running a mix of 12.2.4, 12.2.5 and 12.2.8 I'm > seeing OSDs writing heavily to their logfiles spitting out these lines: > > > 2018-10-10 21:52:04.019037 7f90c2f0f700 0 stupidalloc 0x0x55828ae047d0 > dump 0x15cd2078000~34000 > 2018-10-10 21:52:04.019038 7f90c2f0f700 0 stupidalloc 0x0x55828ae047d0 > dump 0x15cd22cc000~24000 > 2018-10-10 21:52:04.019038 7f90c2f0f700 0 stupidalloc 0x0x55828ae047d0 > dump 0x15cd2300000~20000 > 2018-10-10 21:52:04.019039 7f90c2f0f700 0 stupidalloc 0x0x55828ae047d0 > dump 0x15cd2324000~24000 > 2018-10-10 21:52:04.019040 7f90c2f0f700 0 stupidalloc 0x0x55828ae047d0 > dump 0x15cd26c0000~24000 > 2018-10-10 21:52:04.019041 7f90c2f0f700 0 stupidalloc 0x0x55828ae047d0 > dump 0x15cd2704000~30000 > > It goes so fast that the OS-disk in this case can't keep up and become > 100% util. > > This causes the OSD to slow down and cause slow requests and starts to flap. > > It seems that this is *only* happening on OSDs which are the fullest > (~85%) on this cluster and they have about ~400 PGs each (Yes, I know, > that's high). > After some searching I stumbled upon this Bugzilla report: https://bugzilla.redhat.com/show_bug.cgi?id=1600138 That seems to be the same issue, although I'm not 100% sure. Wido > Looking at StupidAllocator.cc I see this piece of code: > > void StupidAllocator::dump() > { > std::lock_guard<std::mutex> l(lock); > for (unsigned bin = 0; bin < free.size(); ++bin) { > ldout(cct, 0) << __func__ << " free bin " << bin << ": " > << free[bin].num_intervals() << " extents" << dendl; > for (auto p = free[bin].begin(); > p != free[bin].end(); > ++p) { > ldout(cct, 0) << __func__ << " 0x" << std::hex << p.get_start() > << "~" > << p.get_len() << std::dec << dendl; > } > } > } > > I'm just wondering why it would spit out these lines and what's causing it. > > Has anybody seen this before? > > Wido > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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