Ok, can you try setting filestore_op_threads to 1 on both cuttlefish and wip-dumpling-perf (with and with wbthrottle, default wbthrottle settings). I suspect I created contention in the filestore op threads (FileStore::lfn_open specifically), and if so setting it to only use 1 thread should even out the performance. -Sam On Fri, Aug 23, 2013 at 1:44 PM, Oliver Daudey <oliver@xxxxxxxxx> wrote: > Hey Samuel, > > I commented the earlier settings out, so it was with defaults. > > > Regards, > > Oliver > > On vr, 2013-08-23 at 13:35 -0700, Samuel Just wrote: >> When you were running with the wbthrottle on, did you have the >> settings I gave you earlier set, or was it using the defaults? >> -Sam >> >> On Fri, Aug 23, 2013 at 12:48 PM, Oliver Daudey <oliver@xxxxxxxxx> wrote: >> > Hey Samuel, >> > >> > That changed something, for the better. :-) >> > >> > Your test-version, with wbthrottle off: >> > # ceph-osd --version >> > ceph version 0.67.1-18-g3fe3368 >> > (3fe3368ac7178dcd312e89d264d8d81307e582d8) >> > # ceph --admin-daemon /var/run/ceph/ceph-osd.1.asok config show | grep >> > wbthrottle_enable >> > "filestore_wbthrottle_enable": "false", >> > # rbd bench-write test --io-pattern=rand >> > bench-write io_size 4096 io_threads 16 bytes 1073741824 pattern rand >> > SEC OPS OPS/SEC BYTES/SEC >> > 1 838 837.36 2283825.44 >> > 2 1679 827.66 2309860.21 >> > 3 2488 829.30 2320967.64 >> > 4 2812 655.55 1847713.58 >> > 5 3301 659.64 1849006.69 >> > <...> >> > 120 54113 450.83 1271297.14 >> > 121 54847 453.13 1277957.21 >> > 122 55502 454.93 1281769.31 >> > 123 55768 451.09 1271512.03 >> > 124 55853 450.42 1269452.15 >> > 126 55889 442.22 1246494.89 >> > 127 56351 443.71 1250308.66 >> > 128 57135 446.36 1257746.91 >> > 129 57445 444.03 1251566.31 >> > 130 57944 445.72 1256426.99 >> > >> > Now with the wbthrottle-option enabled: >> > # ceph-osd --version >> > ceph version 0.67.1-18-g3fe3368 >> > (3fe3368ac7178dcd312e89d264d8d81307e582d8) >> > # ceph --admin-daemon /var/run/ceph/ceph-osd.1.asok config show | grep >> > wbthrottle_enable >> > "filestore_wbthrottle_enable": "true", >> > # rbd bench-write test --io-pattern=randbench-write io_size 4096 >> > io_threads 16 bytes 1073741824 pattern rand >> > SEC OPS OPS/SEC BYTES/SEC >> > 1 822 821.23 2303875.45 >> > 2 1510 738.54 2021390.37 >> > 3 2224 740.29 1989216.54 >> > 4 2843 708.01 1912598.24 >> > 5 3294 652.35 1774048.26 >> > <...> >> > 120 59470 495.58 1388776.41 >> > 122 60067 489.29 1370954.96 >> > 123 60083 487.74 1366434.49 >> > 124 60449 487.49 1366477.77 >> > 125 61122 488.97 1370480.73 >> > 126 61679 489.52 1372290.03 >> > 127 62195 489.69 1372523.64 >> > 128 62608 489.02 1370226.98 >> > 129 62655 485.68 1360719.66 >> > 130 62688 482.01 1350560.76 >> > >> > Slightly faster than with wbthrottle disabled.. For comparison, one >> > more time with Cuttlefish-OSDs: >> > # ceph-osd --version >> > ceph version 0.61.7 (8f010aff684e820ecc837c25ac77c7a05d7191ff) >> > # rbd bench-write test --io-pattern=rand >> > bench-write io_size 4096 io_threads 16 bytes 1073741824 pattern rand >> > SEC OPS OPS/SEC BYTES/SEC >> > 1 1074 1073.80 3079631.51 >> > 2 2121 1060.21 3001542.58 >> > 3 3111 845.59 2422586.94 >> > 4 3132 745.40 2132915.48 >> > 5 3336 665.33 1904205.15 >> > <...> >> > 120 63700 530.81 1530767.77 >> > 121 64781 535.37 1544861.37 >> > 122 64944 532.10 1535398.54 >> > 123 65312 527.70 1522971.49 >> > 124 65526 528.42 1525134.71 >> > 125 66160 529.12 1527158.94 >> > 126 67214 533.44 1539955.47 >> > 127 67855 534.29 1541965.13 >> > 128 67939 528.79 1526270.55 >> > 129 68178 528.44 1525239.57 >> > 130 68811 529.24 1527681.84 >> > >> > Cuttlefish still wins, but by a much smaller margin now. Looks like >> > we're onto something. The fdatasync seems to be the key here, rather >> > than disabling wbthrottle. >> > >> > >> > Regards, >> > >> > Oliver >> > >> > On 23-08-13 19:53, Samuel Just wrote: >> >> I pushed a branch, wip-dumpling-perf. It does two things: >> >> 1) adds a config filestore_wbthrottle_enable (defaults to true) to >> >> allow you to disable the wbthrottle altogether >> >> 2) causes the wbthrottle when enabled to fdatasync rather than fsync. >> >> >> >> Can you rerun the random workload with that branch with >> >> filestore_wbthrottle_enable on and then off? >> >> -Sam >> >> >> >> On Fri, Aug 23, 2013 at 10:26 AM, Oliver Daudey <oliver@xxxxxxxxx> >> > wrote: >> >>> Hey Sage, >> >>> >> >>> I'm all for it and will help testing. >> >>> >> >>> >> >>> Regards, >> >>> >> >>> Oliver >> > >> > > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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