With this change reads gone, but performance still low. On 3/30/16, 3:32 PM, "Sage Weil" <sage@xxxxxxxxxxxx> wrote: >Evgeniy, > >Do you mind repeating your test with this code applied? > >Thanks! >sage > > >On Wed, 30 Mar 2016, Jason Dillaman wrote: > >> Opened PR 8380 [1] to pass the WILLNEED flag for object map updates. >> >> [1] https://github.com/ceph/ceph/pull/8380 >> >> -- >> >> Jason Dillaman >> >> >> ----- Original Message ----- >> > From: "Sage Weil" <sage@xxxxxxxxxxxx> >> > To: "Jason Dillaman" <dillaman@xxxxxxxxxx> >> > Cc: "Evgeniy Firsov" <Evgeniy.Firsov@xxxxxxxxxxx>, >>ceph-devel@xxxxxxxxxxxxxxx >> > Sent: Wednesday, March 30, 2016 4:02:16 PM >> > Subject: Re: reads while 100% write >> > >> > On Wed, 30 Mar 2016, Jason Dillaman wrote: >> > > This IO is being performed within an OSD class method. I can add a >>new >> > > cls_cxx_read2 method to accept cache hints and update the associated >> > > object map methods. Would this apply to writes as well? >> > >> > Yeah, we'll want to hint them both. >> > >> > s >> > >> > > >> > > -- >> > > >> > > Jason Dillaman >> > > >> > > >> > > ----- Original Message ----- >> > > > From: "Sage Weil" <sage@xxxxxxxxxxxx> >> > > > To: "Jason Dillaman" <dillaman@xxxxxxxxxx> >> > > > Cc: "Evgeniy Firsov" <Evgeniy.Firsov@xxxxxxxxxxx>, >> > > > ceph-devel@xxxxxxxxxxxxxxx >> > > > Sent: Wednesday, March 30, 2016 3:55:14 PM >> > > > Subject: Re: reads while 100% write >> > > > >> > > > On Wed, 30 Mar 2016, Jason Dillaman wrote: >> > > > > Are you using the RBD default of 4MB object sizes or are you >>using >> > > > > something much smaller like 64KB? An object map of that size >>should be >> > > > > tracking up to 24,576,000 objects. When you ran your test >>before, did >> > > > > you have the RBD object map disabled? This definitely seems to >>be a >> > > > > use >> > > > > case where the lack of a cache in front of BlueStore is hurting >>small >> > > > > IO. >> > > > >> > > > Using the rados cache hint WILLNEED is probably appropriate here.. >> > > > >> > > > sage >> > > > >> > > > > >> > > > > -- >> > > > > >> > > > > Jason Dillaman >> > > > > >> > > > > >> > > > > ----- Original Message ----- >> > > > > > From: "Evgeniy Firsov" <Evgeniy.Firsov@xxxxxxxxxxx> >> > > > > > To: "Jason Dillaman" <dillaman@xxxxxxxxxx> >> > > > > > Cc: "Sage Weil" <sage@xxxxxxxxxxxx>, >>ceph-devel@xxxxxxxxxxxxxxx >> > > > > > Sent: Wednesday, March 30, 2016 3:00:47 PM >> > > > > > Subject: Re: reads while 100% write >> > > > > > >> > > > > > 1.5T in that run. >> > > > > > With 150G behavior is the same. Except it says "_do_read 0~18 >>size >> > > > > > 615030” >> > > > > > instead of 6M. >> > > > > > >> > > > > > Also when random 4k write starts there are more reads then >>writes: >> > > > > > >> > > > > > Device: rrqm/s wrqm/s r/s w/s rkB/s >>wkB/s >> > > > > > avgrq-sz >> > > > > > avgqu-sz await r_await w_await svctm %util >> > > > > > >> > > > > > sdd 0.00 1887.00 0.00 344.00 0.00 >>8924.00 >> > > > > > 51.88 >> > > > > > 0.36 1.06 0.00 1.06 0.91 31.20 >> > > > > > sde 30.00 0.00 30.00 957.00 18120.00 >>3828.00 >> > > > > > 44.47 >> > > > > > 0.25 0.26 3.87 0.14 0.17 16.40 >> > > > > > >> > > > > > Logs: http://pastebin.com/gGzfR5ez >> > > > > > >> > > > > > >> > > > > > On 3/30/16, 11:37 AM, "Jason Dillaman" <dillaman@xxxxxxxxxx> >>wrote: >> > > > > > >> > > > > > >How large is your RBD image? 100 terabytes? >> > > > > > > >> > > > > > >-- >> > > > > > > >> > > > > > >Jason Dillaman >> > > > > > > >> > > > > > > >> > > > > > >----- Original Message ----- >> > > > > > >> From: "Evgeniy Firsov" <Evgeniy.Firsov@xxxxxxxxxxx> >> > > > > > >> To: "Sage Weil" <sage@xxxxxxxxxxxx> >> > > > > > >> Cc: ceph-devel@xxxxxxxxxxxxxxx >> > > > > > >> Sent: Wednesday, March 30, 2016 2:14:12 PM >> > > > > > >> Subject: Re: reads while 100% write >> > > > > > >> >> > > > > > >> These are suspicious lines: >> > > > > > >> >> > > > > > >> 2016-03-30 10:54:23.142205 7f2e933ff700 10 >>bluestore(src/dev/osd0) >> > > > > > >> read >> > > > > > >> 0.d_head #0:b06b5e8e:::rbd_object_map.10046b8b4567:head# >> > > > > > >> 6144018~6012 >> > > > > > >> = >> > > > > > >> 6012 >> > > > > > >> 2016-03-30 10:54:23.142252 7f2e933ff700 15 >>bluestore(src/dev/osd0) >> > > > > > >> read >> > > > > > >> 0.d_head #0:b06b5e8e:::rbd_object_map.10046b8b4567:head# >>8210~4096 >> > > > > > >> 2016-03-30 10:54:23.142260 7f2e933ff700 20 >>bluestore(src/dev/osd0) >> > > > > > >> _do_read 8210~4096 size 6150030 >> > > > > > >> 2016-03-30 10:54:23.142267 7f2e933ff700 5 >> > > > > > >> bdev(src/dev/osd0/block) >> > > > > > >> read >> > > > > > >> 8003854336~8192 >> > > > > > >> 2016-03-30 10:54:23.142609 7f2e933ff700 10 >>bluestore(src/dev/osd0) >> > > > > > >> read >> > > > > > >> 0.d_head #0:b06b5e8e:::rbd_object_map.10046b8b4567:head# >>8210~4096 >> > > > > > >> = >> > > > > > >>4096 >> > > > > > >> 2016-03-30 10:54:23.142882 7f2e933ff700 15 >>bluestore(src/dev/osd0) >> > > > > > >>_write >> > > > > > >> 0.d_head #0:b06b5e8e:::rbd_object_map.10046b8b4567:head# >>8210~4096 >> > > > > > >> 2016-03-30 10:54:23.142888 7f2e933ff700 20 >>bluestore(src/dev/osd0) >> > > > > > >> _do_write #0:b06b5e8e:::rbd_object_map.10046b8b4567:head# >> > > > > > >> 8210~4096 - >> > > > > > >>have >> > > > > > >> 6150030 bytes in 1 extents >> > > > > > >> >> > > > > > >> More logs here: http://pastebin.com/74WLzFYw >> > > > > > >> >> > > > > > >> >> > > > > > >> >> > > > > > >> On 3/30/16, 4:19 AM, "Sage Weil" <sage@xxxxxxxxxxxx> wrote: >> > > > > > >> >> > > > > > >> >On Wed, 30 Mar 2016, Evgeniy Firsov wrote: >> > > > > > >> >> After pulling master branch on Friday I start seeing >>odd fio >> > > > > > >>behavior, I >> > > > > > >> >> see a lot of reads while writing and very low >>performance no >> > > > > > >> >> matter >> > > > > > >> >> whether it read or write workload. >> > > > > > >> >> >> > > > > > >> >> Output from sequential 1M write: >> > > > > > >> >> Device: rrqm/s wrqm/s r/s w/s rkB/s >> > > > > > >> >> wkB/s >> > > > > > >> >>avgrq-sz >> > > > > > >> >> avgqu-sz await r_await w_await svctm %util >> > > > > > >> >> >> > > > > > >> >> sdd 0.00 409.00 0.00 364.00 0.00 >> > > > > > >> >> 3092.00 >> > > > > > >> >>16.99 >> > > > > > >> >> 0.28 0.78 0.00 0.78 0.76 27.60 >> > > > > > >> >> sde 0.00 242.00 365.00 363.00 2436.00 >> > > > > > >> >> 9680.00 >> > > > > > >> >>33.29 >> > > > > > >> >> 0.18 0.24 0.42 0.07 0.23 16.80 >> > > > > > >> >> >> > > > > > >> >> >> > > > > > >> >> >> > > > > > >> >> block.db -> /dev/sdd >> > > > > > >> >> block -> /dev/sde >> > > > > > >> >> >> > > > > > >> >> health HEALTH_OK >> > > > > > >> >> monmap e1: 1 mons at {a=127.0.0.1:6789/0} >> > > > > > >> >> election epoch 3, quorum 0 a >> > > > > > >> >> osdmap e7: 1 osds: 1 up, 1 in >> > > > > > >> >> flags sortbitwise >> > > > > > >> >> pgmap v24: 64 pgs, 1 pools, 577 MB data, 9152 objects >> > > > > > >> >> 8210 MB used, 178 GB / 186 GB avail >> > > > > > >> >> 64 active+clean >> > > > > > >> >> client io 1550 kB/s rd, 9559 kB/s wr, 645 op/s rd, 387 >>op/s wr >> > > > > > >> >> >> > > > > > >> >> >> > > > > > >> >> While on earlier revision(c1e41af) everything looks as >> > > > > > >> >> expected: >> > > > > > >> >> >> > > > > > >> >> Device: rrqm/s wrqm/s r/s w/s rkB/s >> > > > > > >> >> wkB/s >> > > > > > >> >>avgrq-sz >> > > > > > >> >> avgqu-sz await r_await w_await svctm %util >> > > > > > >> >> sdd 0.00 4910.00 0.00 680.00 0.00 >> > > > > > >> >> 22416.00 >> > > > > > >> >>65.93 >> > > > > > >> >> 1.05 1.55 0.00 1.55 1.18 80.00 >> > > > > > >> >> sde 0.00 0.00 0.00 3418.00 0.00 >> > > > > > >> >> 217612.00 >> > > > > > >> >> 127.33 63.78 18.18 0.00 18.18 0.25 86.40 >> > > > > > >> >> >> > > > > > >> >> Other observation, may be related to the issue, is that >>CPU >> > > > > > >> >> load is >> > > > > > >> >> imbalanced. Single ³tp_osd_tp² thread is 100% busy, >>while the >> > > > > > >> >> rest >> > > > > > >> >> is >> > > > > > >> >>idle. >> > > > > > >> >> Looks like all load goes to single thread pool shard, >>earlier >> > > > > > >> >> CPU >> > > > > > >> >> was >> > > > > > >> >>well >> > > > > > >> >> balanced. >> > > > > > >> > >> > > > > > >> >Hmm. Can you capture a log with debug bluestore = 20 and >>debug >> > > > > > >> >bdev >> > > > > > >> >= >> > > > > > >>20? >> > > > > > >> > >> > > > > > >> >Thanks! >> > > > > > >> >sage >> > > > > > >> > >> > > > > > >> > >> > > > > > >> >> >> > > > > > >> >> >> > > > > > >> >> ‹ >> > > > > > >> >> Evgeniy >> > > > > > >> >> >> > > > > > >> >> >> > > > > > >> >> >> > > > > > >> >> PLEASE NOTE: The information contained in this >>electronic mail >> > > > > > >>message >> > > > > > >> >>is intended only for the use of the designated >>recipient(s) >> > > > > > >> >>named >> > > > > > >>above. >> > > > > > >> >>If the reader of this message is not the intended >>recipient, you >> > > > > > >> >>are >> > > > > > >> >>hereby notified that you have received this message in >>error and >> > > > > > >> >>that >> > > > > > >> >>any review, dissemination, distribution, or copying of >>this >> > > > > > >> >>message >> > > > > > >> >>is >> > > > > > >> >>strictly prohibited. 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