I don't know the actual size of "small io". And what's ceph version you used. But I think it's possible if KeyValueStore only has half performance compared to FileStore in small io size. A new config value let user can tunes it will be introduced and maybe help. All in all, maybe you could tell more about "ceph_smalliobench" On Tue, Jun 3, 2014 at 1:36 PM, Sushma R <gsushma@xxxxxxxxx> wrote: > Hi Haomai, > > I tried to compare the READ performance of FileStore and KeyValueStore using > the internal tool "ceph_smalliobench" and I see KeyValueStore's performance > is approx half that of FileStore. I'm using similar conf file as yours. Is > this the expected behavior or am I missing something? > > Thanks, > Sushma > > > On Fri, Feb 28, 2014 at 11:00 PM, Haomai Wang <haomaiwang@xxxxxxxxx> wrote: >> >> On Sat, Mar 1, 2014 at 8:04 AM, Danny Al-Gaaf <danny.al-gaaf@xxxxxxxxx> >> wrote: >> > Hi, >> > >> > Am 28.02.2014 03:45, schrieb Haomai Wang: >> > [...] >> >> I use fio which rbd supported from >> >> TelekomCloud(https://github.com/TelekomCloud/fio/commits/rbd-engine) >> >> to test rbd. >> > >> > I would recommend to no longer use this branch, it's outdated. The rbd >> > engine got contributed back to upstream fio and is now merged [1]. For >> > more information read [2]. >> > >> > [1] https://github.com/axboe/fio/commits/master >> > [2] >> > >> > http://telekomcloud.github.io/ceph/2014/02/26/ceph-performance-analysis_fio_rbd.html >> > >> >> >> >> The fio command: fio -direct=1 -iodepth=64 -thread -rw=randwrite >> >> -ioengine=rbd -bs=4k -size=19G -numjobs=1 -runtime=100 >> >> -group_reporting -name=ebs_test -pool=openstack -rbdname=image >> >> -clientname=fio -invalidate=0 >> > >> > Don't use runtime and size at the same time, since runtime limits the >> > size. What we normally do we let the fio job fill up the whole rbd or we >> > limit it only via runtime. >> > >> >> ============================================ >> >> >> >> FileStore result: >> >> ebs_test: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, >> >> iodepth=64 >> >> fio-2.1.4 >> >> Starting 1 thread >> >> rbd engine: RBD version: 0.1.8 >> >> >> >> ebs_test: (groupid=0, jobs=1): err= 0: pid=30886: Thu Feb 27 08:09:18 >> >> 2014 >> >> write: io=283040KB, bw=6403.4KB/s, iops=1600, runt= 44202msec >> >> slat (usec): min=116, max=2817, avg=195.78, stdev=56.45 >> >> clat (msec): min=8, max=661, avg=39.57, stdev=29.26 >> >> lat (msec): min=9, max=661, avg=39.77, stdev=29.25 >> >> clat percentiles (msec): >> >> | 1.00th=[ 15], 5.00th=[ 20], 10.00th=[ 23], 20.00th=[ >> >> 28], >> >> | 30.00th=[ 31], 40.00th=[ 35], 50.00th=[ 37], 60.00th=[ >> >> 40], >> >> | 70.00th=[ 43], 80.00th=[ 46], 90.00th=[ 51], 95.00th=[ >> >> 58], >> >> | 99.00th=[ 128], 99.50th=[ 210], 99.90th=[ 457], 99.95th=[ >> >> 494], >> >> | 99.99th=[ 545] >> >> bw (KB /s): min= 2120, max=12656, per=100.00%, avg=6464.27, >> >> stdev=1726.55 >> >> lat (msec) : 10=0.01%, 20=5.91%, 50=83.35%, 100=8.88%, 250=1.47% >> >> lat (msec) : 500=0.34%, 750=0.05% >> >> cpu : usr=29.83%, sys=1.36%, ctx=84002, majf=0, minf=216 >> >> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=17.4%, >> >> >=64=82.6% >> >> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >> >> >=64=0.0% >> >> complete : 0=0.0%, 4=99.1%, 8=0.5%, 16=0.3%, 32=0.1%, 64=0.1%, >> >> >=64=0.0% >> >> issued : total=r=0/w=70760/d=0, short=r=0/w=0/d=0 >> >> latency : target=0, window=0, percentile=100.00%, depth=64 >> >> >> >> Run status group 0 (all jobs): >> >> WRITE: io=283040KB, aggrb=6403KB/s, minb=6403KB/s, maxb=6403KB/s, >> >> mint=44202msec, maxt=44202msec >> >> >> >> Disk stats (read/write): >> >> sdb: ios=5/9512, merge=0/69, ticks=4/10649, in_queue=10645, >> >> util=0.92% >> >> >> >> =============================================== >> >> >> >> KeyValueStore: >> >> ebs_test: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, >> >> iodepth=64 >> >> fio-2.1.4 >> >> Starting 1 thread >> >> rbd engine: RBD version: 0.1.8 >> >> >> >> ebs_test: (groupid=0, jobs=1): err= 0: pid=29137: Thu Feb 27 08:06:30 >> >> 2014 >> >> write: io=444376KB, bw=6280.2KB/s, iops=1570, runt= 70759msec >> >> slat (usec): min=122, max=3237, avg=184.51, stdev=37.76 >> >> clat (msec): min=10, max=168, avg=40.57, stdev= 5.70 >> >> lat (msec): min=11, max=168, avg=40.75, stdev= 5.71 >> >> clat percentiles (msec): >> >> | 1.00th=[ 34], 5.00th=[ 37], 10.00th=[ 39], 20.00th=[ >> >> 39], >> >> | 30.00th=[ 40], 40.00th=[ 40], 50.00th=[ 41], 60.00th=[ >> >> 41], >> >> | 70.00th=[ 42], 80.00th=[ 42], 90.00th=[ 44], 95.00th=[ >> >> 45], >> >> | 99.00th=[ 48], 99.50th=[ 50], 99.90th=[ 163], 99.95th=[ >> >> 167], >> >> | 99.99th=[ 167] >> >> bw (KB /s): min= 4590, max= 7480, per=100.00%, avg=6285.69, >> >> stdev=374.22 >> >> lat (msec) : 20=0.02%, 50=99.58%, 100=0.23%, 250=0.17% >> >> cpu : usr=29.11%, sys=1.10%, ctx=118564, majf=0, minf=194 >> >> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.7%, >> >> >=64=99.3% >> >> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >> >> >=64=0.0% >> >> complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.1%, 32=0.0%, 64=0.1%, >> >> >=64=0.0% >> >> issued : total=r=0/w=111094/d=0, short=r=0/w=0/d=0 >> >> latency : target=0, window=0, percentile=100.00%, depth=64 >> >> >> >> Run status group 0 (all jobs): >> >> WRITE: io=444376KB, aggrb=6280KB/s, minb=6280KB/s, maxb=6280KB/s, >> >> mint=70759msec, maxt=70759msec >> >> >> >> Disk stats (read/write): >> >> sdb: ios=0/15936, merge=0/272, ticks=0/17157, in_queue=17146, >> >> util=0.94% >> >> >> >> >> >> It's just a simple test, maybe exist some misleadings on the config or >> >> results. But >> >> we can obviously see the conspicuous improvement for KeyValueStore. >> > >> > The numbers are hard to compare. Since the tests wrote a different >> > amount of data. This could influence the numbers. >> > >> > Do you mean improvements compared to former implementation or to >> > FileStore? >> > >> > Without a retest with the latest fio rbd engine: there is not so much >> > difference between KVS and FS atm. >> > >> > Btw. Nice to see the rbd engine is useful to others ;-) >> >> Thanks for your advise and jobs on fio-rbd. :) >> >> The test isn't preciseness and just a simple test to show the progress >> of kvstore. >> >> > >> > Regards >> > >> > Danny >> >> >> >> -- >> Best Regards, >> >> Wheat >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -- Best Regards, Wheat -- 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
