>>Just an update, there seems to be no proper way to pass iothread >>parameter from openstack-nova (not at least in Juno release). So a >>default single iothread per VM is what all we have. So in conclusion a >>nova instance max iops on ceph rbd will be limited to 30-40K.
Thanks for the update. For proxmox users, I have added iothread option to gui for proxmox 4.0, and added jemalloc as default memory allocator I have also send a jemmaloc patch to qemu dev mailing https://lists.gnu.org/archive/html/qemu-devel/2015-06/msg05265.html (Help is welcome to push it in qemu upstream ! ) ----- Mail original ----- De: "pushpesh sharma" <pushpesh....@gmail.com> À: "aderumier" <aderum...@odiso.com> Cc: "Somnath Roy" <somnath....@sandisk.com>, "Irek Fasikhov" <malm...@gmail.com>, "ceph-devel" <ceph-de...@vger.kernel.org>, "ceph-users" <ceph-users@lists.ceph.com> Envoyé: Lundi 22 Juin 2015 07:58:47 Objet: Re: rbd_cache, limiting read on high iops around 40k Just an update, there seems to be no proper way to pass iothread parameter from openstack-nova (not at least in Juno release). So a default single iothread per VM is what all we have. So in conclusion a nova instance max iops on ceph rbd will be limited to 30-40K. On Tue, Jun 16, 2015 at 10:08 PM, Alexandre DERUMIER <aderum...@odiso.com> wrote: > Hi, > > some news about qemu with tcmalloc vs jemmaloc. > > I'm testing with multiple disks (with iothreads) in 1 qemu guest. > > And if tcmalloc is a little faster than jemmaloc, > > I have hit a lot of time the tcmalloc::ThreadCache::ReleaseToCentralCache > bug. > > increasing TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES, don't help. > > > with multiple disk, I'm around 200k iops with tcmalloc (before hitting the > bug) and 350kiops with jemmaloc. > > The problem is that when I hit malloc bug, I'm around 4000-10000 iops, and > only way to fix is is to restart qemu ... > > > > ----- Mail original ----- > De: "pushpesh sharma" <pushpesh....@gmail.com> > À: "aderumier" <aderum...@odiso.com> > Cc: "Somnath Roy" <somnath....@sandisk.com>, "Irek Fasikhov" > <malm...@gmail.com>, "ceph-devel" <ceph-de...@vger.kernel.org>, "ceph-users" > <ceph-users@lists.ceph.com> > Envoyé: Vendredi 12 Juin 2015 08:58:21 > Objet: Re: rbd_cache, limiting read on high iops around 40k > > Thanks, posted the question in openstack list. Hopefully will get some > expert opinion. > > On Fri, Jun 12, 2015 at 11:33 AM, Alexandre DERUMIER > <aderum...@odiso.com> wrote: >> Hi, >> >> here a libvirt xml sample from libvirt src >> >> (you need to define <iothreads> number, then assign then in disks). >> >> I don't use openstack, so I really don't known how it's working with it. >> >> >> <domain type='qemu'> >> <name>QEMUGuest1</name> >> <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> >> <memory unit='KiB'>219136</memory> >> <currentMemory unit='KiB'>219136</currentMemory> >> <vcpu placement='static'>2</vcpu> >> <iothreads>2</iothreads> >> <os> >> <type arch='i686' machine='pc'>hvm</type> >> <boot dev='hd'/> >> </os> >> <clock offset='utc'/> >> <on_poweroff>destroy</on_poweroff> >> <on_reboot>restart</on_reboot> >> <on_crash>destroy</on_crash> >> <devices> >> <emulator>/usr/bin/qemu</emulator> >> <disk type='file' device='disk'> >> <driver name='qemu' type='raw' iothread='1'/> >> <source file='/var/lib/libvirt/images/iothrtest1.img'/> >> <target dev='vdb' bus='virtio'/> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> >> </disk> >> <disk type='file' device='disk'> >> <driver name='qemu' type='raw' iothread='2'/> >> <source file='/var/lib/libvirt/images/iothrtest2.img'/> >> <target dev='vdc' bus='virtio'/> >> </disk> >> <controller type='usb' index='0'/> >> <controller type='ide' index='0'/> >> <controller type='pci' index='0' model='pci-root'/> >> <memballoon model='none'/> >> </devices> >> </domain> >> >> >> ----- Mail original ----- >> De: "pushpesh sharma" <pushpesh....@gmail.com> >> À: "aderumier" <aderum...@odiso.com> >> Cc: "Somnath Roy" <somnath....@sandisk.com>, "Irek Fasikhov" >> <malm...@gmail.com>, "ceph-devel" <ceph-de...@vger.kernel.org>, "ceph-users" >> <ceph-users@lists.ceph.com> >> Envoyé: Vendredi 12 Juin 2015 07:52:41 >> Objet: Re: rbd_cache, limiting read on high iops around 40k >> >> Hi Alexandre, >> >> I agree with your rational, of one iothread per disk. CPU consumed in >> IOwait is pretty high in each VM. But I am not finding a way to set >> the same on a nova instance. I am using openstack Juno with QEMU+KVM. >> As per libvirt documentation for setting iothreads, I can edit >> domain.xml directly and achieve the same effect. However in as in >> openstack env domain xml is created by nova with some additional >> metadata, so editing the domain xml using 'virsh edit' does not seems >> to work(I agree, it is not a very cloud way of doing things, but a >> hack). Changes made there vanish after saving them, due to reason >> libvirt validation fails on the same. >> >> #virsh dumpxml instance-000000c5 > vm.xml >> #virt-xml-validate vm.xml >> Relax-NG validity error : Extra element cpu in interleave >> vm.xml:1: element domain: Relax-NG validity error : Element domain >> failed to validate content >> vm.xml fails to validate >> >> Second approach I took was to setting QoS in volumes types. But there >> is no option to set iothreads per volume, there are parameter realted >> to max_read/wrirte ops/bytes. >> >> Thirdly, editing Nova flavor and proving extra specs like >> hw:cpu_socket/thread/core, can change guest CPU topology however again >> no way to set iothread. It does accept hw_disk_iothreads(no type check >> in place, i believe ), but can not pass the same in domain.xml. >> >> Could you suggest me a way to set the same. >> >> -Pushpesh >> >> On Wed, Jun 10, 2015 at 12:59 PM, Alexandre DERUMIER >> <aderum...@odiso.com> wrote: >>>>>I need to try out the performance on qemu soon and may come back to you if >>>>>I need some qemu setting trick :-) >>> >>> Sure no problem. >>> >>> (BTW, I can reach around 200k iops in 1 qemu vm with 5 virtio disks with 1 >>> iothread by disk) >>> >>> >>> ----- Mail original ----- >>> De: "Somnath Roy" <somnath....@sandisk.com> >>> À: "aderumier" <aderum...@odiso.com>, "Irek Fasikhov" <malm...@gmail.com> >>> Cc: "ceph-devel" <ceph-de...@vger.kernel.org>, "pushpesh sharma" >>> <pushpesh....@gmail.com>, "ceph-users" <ceph-users@lists.ceph.com> >>> Envoyé: Mercredi 10 Juin 2015 09:06:32 >>> Objet: RE: rbd_cache, limiting read on high iops around 40k >>> >>> Hi Alexandre, >>> Thanks for sharing the data. >>> I need to try out the performance on qemu soon and may come back to you if >>> I need some qemu setting trick :-) >>> >>> Regards >>> Somnath >>> >>> -----Original Message----- >>> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of >>> Alexandre DERUMIER >>> Sent: Tuesday, June 09, 2015 10:42 PM >>> To: Irek Fasikhov >>> Cc: ceph-devel; pushpesh sharma; ceph-users >>> Subject: Re: [ceph-users] rbd_cache, limiting read on high iops around 40k >>> >>>>>Very good work! >>>>>Do you have a rpm-file? >>>>>Thanks. >>> no sorry, I'm have compiled it manually (and I'm using debian jessie as >>> client) >>> >>> >>> >>> ----- Mail original ----- >>> De: "Irek Fasikhov" <malm...@gmail.com> >>> À: "aderumier" <aderum...@odiso.com> >>> Cc: "Robert LeBlanc" <rob...@leblancnet.us>, "ceph-devel" >>> <ceph-de...@vger.kernel.org>, "pushpesh sharma" <pushpesh....@gmail.com>, >>> "ceph-users" <ceph-users@lists.ceph.com> >>> Envoyé: Mercredi 10 Juin 2015 07:21:42 >>> Objet: Re: [ceph-users] rbd_cache, limiting read on high iops around 40k >>> >>> Hi, Alexandre. >>> >>> Very good work! >>> Do you have a rpm-file? >>> Thanks. >>> >>> 2015-06-10 7:10 GMT+03:00 Alexandre DERUMIER < aderum...@odiso.com > : >>> >>> >>> Hi, >>> >>> I have tested qemu with last tcmalloc 2.4, and the improvement is huge with >>> iothread: 50k iops (+45%) ! >>> >>> >>> >>> qemu : no iothread : glibc : iops=33395 qemu : no-iothread : tcmalloc >>> (2.2.1) : iops=34516 (+3%) qemu : no-iothread : jemmaloc : iops=42226 >>> (+26%) qemu : no-iothread : tcmalloc (2.4) : iops=35974 (+7%) >>> >>> >>> qemu : iothread : glibc : iops=34516 >>> qemu : iothread : tcmalloc : iops=38676 (+12%) qemu : iothread : jemmaloc : >>> iops=28023 (-19%) qemu : iothread : tcmalloc (2.4) : iops=50276 (+45%) >>> >>> >>> >>> >>> >>> qemu : iothread : tcmalloc (2.4) : iops=50276 (+45%) >>> ------------------------------------------------------ >>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>> ioengine=libaio, iodepth=32 >>> fio-2.1.11 >>> Starting 1 process >>> Jobs: 1 (f=1): [r(1)] [100.0% done] [214.7MB/0KB/0KB /s] [54.1K/0/0 iops] >>> [eta 00m:00s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=894: Wed Jun 10 >>> 05:54:24 2015 read : io=5120.0MB, bw=201108KB/s, iops=50276, runt= >>> 26070msec slat (usec): min=1, max=1136, avg= 3.54, stdev= 3.58 clat (usec): >>> min=128, max=6262, avg=631.41, stdev=197.71 lat (usec): min=149, max=6265, >>> avg=635.27, stdev=197.40 clat percentiles (usec): >>> | 1.00th=[ 318], 5.00th=[ 378], 10.00th=[ 418], 20.00th=[ 474], >>> | 30.00th=[ 516], 40.00th=[ 564], 50.00th=[ 612], 60.00th=[ 652], >>> | 70.00th=[ 700], 80.00th=[ 756], 90.00th=[ 860], 95.00th=[ 980], >>> | 99.00th=[ 1272], 99.50th=[ 1384], 99.90th=[ 1688], 99.95th=[ 1896], >>> | 99.99th=[ 3760] >>> bw (KB /s): min=145608, max=249688, per=100.00%, avg=201108.00, >>> stdev=21718.87 lat (usec) : 250=0.04%, 500=25.84%, 750=53.00%, 1000=16.63% >>> lat (msec) : 2=4.46%, 4=0.03%, 10=0.01% cpu : usr=9.73%, sys=24.93%, >>> ctx=66417, majf=0, minf=38 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, >>> 16=0.1%, 32=100.0%, >=64=0.0% 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=0.0%, 16=0.0%, >>> 32=0.1%, 64=0.0%, >=64=0.0% issued : total=r=1310720/w=0/d=0, >>> short=r=0/w=0/d=0 latency : target=0, window=0, percentile=100.00%, >>> depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=201107KB/s, minb=201107KB/s, maxb=201107KB/s, >>> mint=26070msec, maxt=26070msec >>> >>> Disk stats (read/write): >>> vdb: ios=1302555/0, merge=0/0, ticks=715176/0, in_queue=714840, util=99.73% >>> >>> >>> >>> >>> >>> >>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>> ioengine=libaio, iodepth=32 >>> fio-2.1.11 >>> Starting 1 process >>> Jobs: 1 (f=1): [r(1)] [100.0% done] [158.7MB/0KB/0KB /s] [40.6K/0/0 iops] >>> [eta 00m:00s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=889: Wed Jun 10 >>> 06:05:06 2015 read : io=5120.0MB, bw=143897KB/s, iops=35974, runt= >>> 36435msec slat (usec): min=1, max=710, avg= 3.31, stdev= 3.35 clat (usec): >>> min=191, max=4740, avg=884.66, stdev=315.65 lat (usec): min=289, max=4743, >>> avg=888.31, stdev=315.51 clat percentiles (usec): >>> | 1.00th=[ 462], 5.00th=[ 516], 10.00th=[ 548], 20.00th=[ 596], >>> | 30.00th=[ 652], 40.00th=[ 764], 50.00th=[ 868], 60.00th=[ 940], >>> | 70.00th=[ 1004], 80.00th=[ 1096], 90.00th=[ 1256], 95.00th=[ 1416], >>> | 99.00th=[ 2024], 99.50th=[ 2224], 99.90th=[ 2544], 99.95th=[ 2640], >>> | 99.99th=[ 3632] >>> bw (KB /s): min=98352, max=177328, per=99.91%, avg=143772.11, >>> stdev=21782.39 lat (usec) : 250=0.01%, 500=3.48%, 750=35.69%, 1000=30.01% >>> lat (msec) : 2=29.74%, 4=1.07%, 10=0.01% cpu : usr=7.10%, sys=16.90%, >>> ctx=54855, majf=0, minf=38 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, >>> 16=0.1%, 32=100.0%, >=64=0.0% 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=0.0%, 16=0.0%, >>> 32=0.1%, 64=0.0%, >=64=0.0% issued : total=r=1310720/w=0/d=0, >>> short=r=0/w=0/d=0 latency : target=0, window=0, percentile=100.00%, >>> depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=143896KB/s, minb=143896KB/s, maxb=143896KB/s, >>> mint=36435msec, maxt=36435msec >>> >>> Disk stats (read/write): >>> vdb: ios=1301357/0, merge=0/0, ticks=1033036/0, in_queue=1032716, >>> util=99.85% >>> >>> >>> ----- Mail original ----- >>> De: "aderumier" < aderum...@odiso.com > >>> À: "Robert LeBlanc" < rob...@leblancnet.us > >>> Cc: "Mark Nelson" < mnel...@redhat.com >, "ceph-devel" < >>> ceph-de...@vger.kernel.org >, "pushpesh sharma" < pushpesh....@gmail.com >, >>> "ceph-users" < ceph-users@lists.ceph.com > >>> Envoyé: Mardi 9 Juin 2015 18:47:27 >>> Objet: Re: [ceph-users] rbd_cache, limiting read on high iops around 40k >>> >>> Hi Robert, >>> >>>>>What I found was that Ceph OSDs performed well with either tcmalloc or >>>>>jemalloc (except when RocksDB was built with jemalloc instead of >>>>>tcmalloc, I'm still working to dig into why that might be the case). >>> yes,from my test, for osd tcmalloc is a little faster (but very little) >>> than jemalloc. >>> >>> >>> >>>>>However, I found that tcmalloc with QEMU/KVM was very detrimental to >>>>>small I/O, but provided huge gains in I/O >=1MB. Jemalloc was much >>>>>better for QEMU/KVM in the tests that we ran. [1] >>> >>> >>> Just have done qemu test (4k randread - rbd_cache=off), I don't see speed >>> regression with tcmalloc. >>> with qemu iothread, tcmalloc have a speed increase over glib >>> with qemu iothread, jemalloc have a speed decrease >>> >>> without iothread, jemalloc have a big speed increase >>> >>> this is with >>> -qemu 2.3 >>> -tcmalloc 2.2.1 >>> -jemmaloc 3.6 >>> -libc6 2.19 >>> >>> >>> qemu : no iothread : glibc : iops=33395 >>> qemu : no-iothread : tcmalloc : iops=34516 (+3%) >>> qemu : no-iothread : jemmaloc : iops=42226 (+26%) >>> >>> qemu : iothread : glibc : iops=34516 >>> qemu : iothread : tcmalloc : iops=38676 (+12%) >>> qemu : iothread : jemmaloc : iops=28023 (-19%) >>> >>> >>> (The benefit of iothreads is that we can scale with more disks in 1vm) >>> >>> >>> fio results: >>> ------------ >>> >>> qemu : iothread : tcmalloc : iops=38676 >>> ----------------------------------------- >>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>> ioengine=libaio, iodepth=32 >>> fio-2.1.11 >>> Starting 1 process >>> Jobs: 1 (f=0): [r(1)] [100.0% done] [123.5MB/0KB/0KB /s] [31.6K/0/0 iops] >>> [eta 00m:00s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=1265: Tue Jun 9 >>> 18:16:53 2015 >>> read : io=5120.0MB, bw=154707KB/s, iops=38676, runt= 33889msec >>> slat (usec): min=1, max=715, avg= 3.63, stdev= 3.42 >>> clat (usec): min=152, max=5736, avg=822.12, stdev=289.34 >>> lat (usec): min=231, max=5740, avg=826.10, stdev=289.08 >>> clat percentiles (usec): >>> | 1.00th=[ 402], 5.00th=[ 466], 10.00th=[ 510], 20.00th=[ 572], >>> | 30.00th=[ 636], 40.00th=[ 716], 50.00th=[ 780], 60.00th=[ 852], >>> | 70.00th=[ 932], 80.00th=[ 1020], 90.00th=[ 1160], 95.00th=[ 1352], >>> | 99.00th=[ 1800], 99.50th=[ 1944], 99.90th=[ 2256], 99.95th=[ 2448], >>> | 99.99th=[ 3888] >>> bw (KB /s): min=123888, max=198584, per=100.00%, avg=154824.40, >>> stdev=16978.03 >>> lat (usec) : 250=0.01%, 500=8.91%, 750=36.44%, 1000=32.63% >>> lat (msec) : 2=21.65%, 4=0.37%, 10=0.01% >>> cpu : usr=8.29%, sys=19.76%, ctx=55882, majf=0, minf=39 >>> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0% >>> 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=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0% >>> issued : total=r=1310720/w=0/d=0, short=r=0/w=0/d=0 >>> latency : target=0, window=0, percentile=100.00%, depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=154707KB/s, minb=154707KB/s, maxb=154707KB/s, >>> mint=33889msec, maxt=33889msec >>> >>> Disk stats (read/write): >>> vdb: ios=1302739/0, merge=0/0, ticks=934444/0, in_queue=934096, util=99.77% >>> >>> >>> >>> qemu : no-iothread : tcmalloc : iops=34516 >>> --------------------------------------------- >>> Jobs: 1 (f=1): [r(1)] [100.0% done] [163.2MB/0KB/0KB /s] [41.8K/0/0 iops] >>> [eta 00m:00s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=896: Tue Jun 9 >>> 18:19:08 2015 >>> read : io=5120.0MB, bw=138065KB/s, iops=34516, runt= 37974msec >>> slat (usec): min=1, max=708, avg= 3.98, stdev= 3.57 >>> clat (usec): min=208, max=11858, avg=921.43, stdev=333.61 >>> lat (usec): min=266, max=11862, avg=925.77, stdev=333.40 >>> clat percentiles (usec): >>> | 1.00th=[ 434], 5.00th=[ 510], 10.00th=[ 564], 20.00th=[ 652], >>> | 30.00th=[ 732], 40.00th=[ 812], 50.00th=[ 876], 60.00th=[ 940], >>> | 70.00th=[ 1020], 80.00th=[ 1112], 90.00th=[ 1320], 95.00th=[ 1576], >>> | 99.00th=[ 1992], 99.50th=[ 2128], 99.90th=[ 2736], 99.95th=[ 3248], >>> | 99.99th=[ 4320] >>> bw (KB /s): min=77312, max=185576, per=99.74%, avg=137709.88, >>> stdev=16883.77 >>> lat (usec) : 250=0.01%, 500=4.36%, 750=27.61%, 1000=35.60% >>> lat (msec) : 2=31.49%, 4=0.92%, 10=0.02%, 20=0.01% >>> cpu : usr=7.19%, sys=19.52%, ctx=55903, majf=0, minf=38 >>> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0% >>> 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=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0% >>> issued : total=r=1310720/w=0/d=0, short=r=0/w=0/d=0 >>> latency : target=0, window=0, percentile=100.00%, depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=138064KB/s, minb=138064KB/s, maxb=138064KB/s, >>> mint=37974msec, maxt=37974msec >>> >>> Disk stats (read/write): >>> vdb: ios=1309902/0, merge=0/0, ticks=1068768/0, in_queue=1068396, >>> util=99.86% >>> >>> >>> >>> qemu : iothread : glibc : iops=34516 >>> ------------------------------------- >>> >>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>> ioengine=libaio, iodepth=32 >>> fio-2.1.11 >>> Starting 1 process >>> Jobs: 1 (f=1): [r(1)] [100.0% done] [133.4MB/0KB/0KB /s] [34.2K/0/0 iops] >>> [eta 00m:00s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=876: Tue Jun 9 >>> 18:24:01 2015 >>> read : io=5120.0MB, bw=137786KB/s, iops=34446, runt= 38051msec >>> slat (usec): min=1, max=496, avg= 3.88, stdev= 3.66 >>> clat (usec): min=283, max=7515, avg=923.34, stdev=300.28 >>> lat (usec): min=286, max=7519, avg=927.58, stdev=300.02 >>> clat percentiles (usec): >>> | 1.00th=[ 506], 5.00th=[ 564], 10.00th=[ 596], 20.00th=[ 652], >>> | 30.00th=[ 724], 40.00th=[ 804], 50.00th=[ 884], 60.00th=[ 964], >>> | 70.00th=[ 1048], 80.00th=[ 1144], 90.00th=[ 1304], 95.00th=[ 1448], >>> | 99.00th=[ 1896], 99.50th=[ 2096], 99.90th=[ 2480], 99.95th=[ 2640], >>> | 99.99th=[ 3984] >>> bw (KB /s): min=102680, max=171112, per=100.00%, avg=137877.78, >>> stdev=15521.30 >>> lat (usec) : 500=0.84%, 750=32.97%, 1000=30.82% >>> lat (msec) : 2=34.65%, 4=0.71%, 10=0.01% >>> cpu : usr=7.42%, sys=19.47%, ctx=52455, majf=0, minf=38 >>> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0% >>> 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=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0% >>> issued : total=r=1310720/w=0/d=0, short=r=0/w=0/d=0 >>> latency : target=0, window=0, percentile=100.00%, depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=137785KB/s, minb=137785KB/s, maxb=137785KB/s, >>> mint=38051msec, maxt=38051msec >>> >>> Disk stats (read/write): >>> vdb: ios=1307426/0, merge=0/0, ticks=1051416/0, in_queue=1050972, >>> util=99.85% >>> >>> >>> >>> qemu : no iothread : glibc : iops=33395 >>> ----------------------------------------- >>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>> ioengine=libaio, iodepth=32 >>> fio-2.1.11 >>> Starting 1 process >>> Jobs: 1 (f=1): [r(1)] [100.0% done] [125.4MB/0KB/0KB /s] [32.9K/0/0 iops] >>> [eta 00m:00s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=886: Tue Jun 9 >>> 18:27:18 2015 >>> read : io=5120.0MB, bw=133583KB/s, iops=33395, runt= 39248msec >>> slat (usec): min=1, max=1054, avg= 3.86, stdev= 4.29 >>> clat (usec): min=139, max=12635, avg=952.85, stdev=335.51 >>> lat (usec): min=303, max=12638, avg=957.01, stdev=335.29 >>> clat percentiles (usec): >>> | 1.00th=[ 516], 5.00th=[ 564], 10.00th=[ 596], 20.00th=[ 652], >>> | 30.00th=[ 724], 40.00th=[ 820], 50.00th=[ 924], 60.00th=[ 996], >>> | 70.00th=[ 1080], 80.00th=[ 1176], 90.00th=[ 1336], 95.00th=[ 1528], >>> | 99.00th=[ 2096], 99.50th=[ 2320], 99.90th=[ 2672], 99.95th=[ 2928], >>> | 99.99th=[ 4832] >>> bw (KB /s): min=98136, max=171624, per=100.00%, avg=133682.64, >>> stdev=19121.91 >>> lat (usec) : 250=0.01%, 500=0.57%, 750=32.57%, 1000=26.98% >>> lat (msec) : 2=38.59%, 4=1.28%, 10=0.01%, 20=0.01% >>> cpu : usr=9.24%, sys=15.92%, ctx=51219, majf=0, minf=38 >>> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0% >>> 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=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0% >>> issued : total=r=1310720/w=0/d=0, short=r=0/w=0/d=0 >>> latency : target=0, window=0, percentile=100.00%, depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=133583KB/s, minb=133583KB/s, maxb=133583KB/s, >>> mint=39248msec, maxt=39248msec >>> >>> Disk stats (read/write): >>> vdb: ios=1304526/0, merge=0/0, ticks=1075020/0, in_queue=1074536, >>> util=99.84% >>> >>> >>> >>> qemu : iothread : jemmaloc : iops=28023 >>> ---------------------------------------- >>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>> ioengine=libaio, iodepth=32 >>> fio-2.1.11 >>> Starting 1 process >>> Jobs: 1 (f=1): [r(1)] [97.9% done] [155.2MB/0KB/0KB /s] [39.1K/0/0 iops] >>> [eta 00m:01s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=899: Tue Jun 9 >>> 18:30:26 2015 >>> read : io=5120.0MB, bw=112094KB/s, iops=28023, runt= 46772msec >>> slat (usec): min=1, max=467, avg= 4.33, stdev= 4.77 >>> clat (usec): min=253, max=11307, avg=1135.63, stdev=346.55 >>> lat (usec): min=256, max=11309, avg=1140.39, stdev=346.22 >>> clat percentiles (usec): >>> | 1.00th=[ 510], 5.00th=[ 628], 10.00th=[ 700], 20.00th=[ 820], >>> | 30.00th=[ 924], 40.00th=[ 1032], 50.00th=[ 1128], 60.00th=[ 1224], >>> | 70.00th=[ 1320], 80.00th=[ 1416], 90.00th=[ 1560], 95.00th=[ 1688], >>> | 99.00th=[ 2096], 99.50th=[ 2224], 99.90th=[ 2544], 99.95th=[ 2832], >>> | 99.99th=[ 3760] >>> bw (KB /s): min=91792, max=174416, per=99.90%, avg=111985.27, >>> stdev=17381.70 >>> lat (usec) : 500=0.80%, 750=13.10%, 1000=23.33% >>> lat (msec) : 2=61.30%, 4=1.46%, 10=0.01%, 20=0.01% >>> cpu : usr=7.12%, sys=17.43%, ctx=54507, majf=0, minf=38 >>> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0% >>> 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=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0% >>> issued : total=r=1310720/w=0/d=0, short=r=0/w=0/d=0 >>> latency : target=0, window=0, percentile=100.00%, depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=112094KB/s, minb=112094KB/s, maxb=112094KB/s, >>> mint=46772msec, maxt=46772msec >>> >>> Disk stats (read/write): >>> vdb: ios=1309169/0, merge=0/0, ticks=1305796/0, in_queue=1305376, >>> util=98.68% >>> >>> >>> >>> qemu : non-iothread : jemmaloc : iops=42226 >>> -------------------------------------------- >>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>> ioengine=libaio, iodepth=32 >>> fio-2.1.11 >>> Starting 1 process >>> Jobs: 1 (f=1): [r(1)] [100.0% done] [171.2MB/0KB/0KB /s] [43.9K/0/0 iops] >>> [eta 00m:00s] >>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=892: Tue Jun 9 >>> 18:34:11 2015 >>> read : io=5120.0MB, bw=177130KB/s, iops=44282, runt= 29599msec >>> slat (usec): min=1, max=527, avg= 3.80, stdev= 3.74 >>> clat (usec): min=174, max=3841, avg=717.08, stdev=237.53 >>> lat (usec): min=210, max=3844, avg=721.23, stdev=237.22 >>> clat percentiles (usec): >>> | 1.00th=[ 354], 5.00th=[ 422], 10.00th=[ 462], 20.00th=[ 516], >>> | 30.00th=[ 572], 40.00th=[ 628], 50.00th=[ 684], 60.00th=[ 740], >>> | 70.00th=[ 804], 80.00th=[ 884], 90.00th=[ 1004], 95.00th=[ 1128], >>> | 99.00th=[ 1544], 99.50th=[ 1672], 99.90th=[ 1928], 99.95th=[ 2064], >>> | 99.99th=[ 2608] >>> bw (KB /s): min=138120, max=230816, per=100.00%, avg=177192.14, >>> stdev=23440.79 >>> lat (usec) : 250=0.01%, 500=16.24%, 750=45.93%, 1000=27.46% >>> lat (msec) : 2=10.30%, 4=0.07% >>> cpu : usr=10.14%, sys=23.84%, ctx=60938, majf=0, minf=39 >>> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0% >>> 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=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0% >>> issued : total=r=1310720/w=0/d=0, short=r=0/w=0/d=0 >>> latency : target=0, window=0, percentile=100.00%, depth=32 >>> >>> Run status group 0 (all jobs): >>> READ: io=5120.0MB, aggrb=177130KB/s, minb=177130KB/s, maxb=177130KB/s, >>> mint=29599msec, maxt=29599msec >>> >>> Disk stats (read/write): >>> vdb: ios=1303992/0, merge=0/0, ticks=798008/0, in_queue=797636, util=99.80% >>> >>> >>> >>> ----- Mail original ----- >>> De: "Robert LeBlanc" < rob...@leblancnet.us > >>> À: "aderumier" < aderum...@odiso.com > >>> Cc: "Mark Nelson" < mnel...@redhat.com >, "ceph-devel" < >>> ceph-de...@vger.kernel.org >, "pushpesh sharma" < pushpesh....@gmail.com >, >>> "ceph-users" < ceph-users@lists.ceph.com > >>> Envoyé: Mardi 9 Juin 2015 18:00:29 >>> Objet: Re: [ceph-users] rbd_cache, limiting read on high iops around 40k >>> >>> -----BEGIN PGP SIGNED MESSAGE----- >>> Hash: SHA256 >>> >>> I also saw a similar performance increase by using alternative memory >>> allocators. What I found was that Ceph OSDs performed well with either >>> tcmalloc or jemalloc (except when RocksDB was built with jemalloc >>> instead of tcmalloc, I'm still working to dig into why that might be >>> the case). >>> >>> However, I found that tcmalloc with QEMU/KVM was very detrimental to >>> small I/O, but provided huge gains in I/O >=1MB. Jemalloc was much >>> better for QEMU/KVM in the tests that we ran. [1] >>> >>> I'm currently looking into I/O bottlenecks around the 16KB range and >>> I'm seeing a lot of time in thread creation and destruction, the >>> memory allocators are quite a bit down the list (both fio with >>> ioengine rbd and on the OSDs). I wonder what the difference can be. >>> I've tried using the async messenger but there wasn't a huge >>> difference. [2] >>> >>> Further down the rabbit hole.... >>> >>> [1] https://www.mail-archive.com/ceph-users@lists.ceph.com/msg20197.html >>> [2] https://www.mail-archive.com/ceph-devel@vger.kernel.org/msg23982.html >>> -----BEGIN PGP SIGNATURE----- >>> Version: Mailvelope v0.13.1 >>> Comment: https://www.mailvelope.com >>> >>> wsFcBAEBCAAQBQJVdw2ZCRDmVDuy+mK58QAA4MwP/1vt65cvTyyVGGSGRrE8 >>> unuWjafMHzl486XH+EaVrDVTXFVFOoncJ6kugSpD7yavtCpZNdhsIaTRZguU >>> YpfAppNAJU5biSwNv9QPI7kPP2q2+I7Z8ZkvhcVnkjIythoeNnSjV7zJrw87 >>> afq46GhPHqEXdjp3rOB4RRPniOMnub5oU6QRnKn3HPW8Dx9ZqTeCofRDnCY2 >>> S695Dt1gzt0ERUOgrUUkt0FQJdkkV6EURcUschngjtEd5727VTLp02HivVl3 >>> vDYWxQHPK8oS6Xe8GOW0JjulwiqlYotSlrqSU5FMU5gozbk9zMFPIUW1e+51 >>> 9ART8Ta2ItMhPWtAhRwwvxgy51exCy9kBc+m+ptKW5XRUXOImGcOQxszPGOO >>> qIIOG1vVG/GBmo/0i6tliqBFYdXmw1qFV7tFiIbisZRH7Q/1NahjYTHqHhu3 >>> Dv61T6WrerD+9N6S1Lrz1QYe2Fqa56BHhHSXM82NE86SVxEvUkoGegQU+c7b >>> 6rY1JvuJHJzva7+M2XHApYCchCs4a1Yyd1qWB7yThJD57RIyX1TOg0+siV13 >>> R+v6wxhQU0vBovH+5oAWmCZaPNT+F0Uvs3xWAxxaIR9r83wMj9qQeBZTKVzQ >>> 1aFIi15KqAwOp12yWCmrqKTeXhjwYQNd8viCQCGN7AQyPglmzfbuEHalVjz4 >>> oSJX >>> =k281 >>> -----END PGP SIGNATURE----- >>> ---------------- >>> Robert LeBlanc >>> GPG Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 >>> >>> >>> On Tue, Jun 9, 2015 at 6:02 AM, Alexandre DERUMIER < aderum...@odiso.com > >>> wrote: >>>>>>Frankly, I'm a little impressed that without RBD cache we can hit 80K >>>>>>IOPS from 1 VM! >>>> >>>> Note that theses result are not in a vm (fio-rbd on host), so in a vm >>>> we'll have overhead. >>>> (I'm planning to send results in qemu soon) >>>> >>>>>>How fast are the SSDs in those 3 OSDs? >>>> >>>> Theses results are with datas in buffer memory of osd nodes. >>>> >>>> When reading fulling on ssd (intel s3500), >>>> >>>> For 1 client, >>>> >>>> I'm around 33k iops without cache and 32k iops with cache, with 1 osd. >>>> I'm around 55k iops without cache and 38k iops with cache, with 3 osd. >>>> >>>> with multiple clients jobs, I can reach around 70kiops by osd , and 250k >>>> iops by osd when datas are in buffer. >>>> >>>> (cpus servers/clients are 2x 10 cores 3,1ghz e5 xeon) >>>> >>>> >>>> >>>> small tip : >>>> I'm using tcmalloc for fio-rbd or rados bench to improve latencies by >>>> around 20% >>>> >>>> LD_PRELOAD=/usr/lib/libtcmalloc_minimal.so.4 fio ... >>>> LD_PRELOAD=/usr/lib/libtcmalloc_minimal.so.4 rados bench ... >>>> >>>> as a lot of time is spent in malloc/free >>>> >>>> >>>> (qemu support also tcmalloc since some months , I'll bench it too >>>> https://lists.gnu.org/archive/html/qemu-devel/2015-03/msg05372.html ) >>>> >>>> >>>> >>>> I'll try to send full bench results soon, from 1 to 18 ssd osd. >>>> >>>> >>>> >>>> >>>> ----- Mail original ----- >>>> De: "Mark Nelson" < mnel...@redhat.com > >>>> À: "aderumier" < aderum...@odiso.com >, "pushpesh sharma" < >>>> pushpesh....@gmail.com > >>>> Cc: "ceph-devel" < ceph-de...@vger.kernel.org >, "ceph-users" < >>>> ceph-users@lists.ceph.com > >>>> Envoyé: Mardi 9 Juin 2015 13:36:31 >>>> Objet: Re: [ceph-users] rbd_cache, limiting read on high iops around 40k >>>> >>>> Hi All, >>>> >>>> In the past we've hit some performance issues with RBD cache that we've >>>> fixed, but we've never really tried pushing a single VM beyond 40+K read >>>> IOPS in testing (or at least I never have). I suspect there's a couple >>>> of possibilities as to why it might be slower, but perhaps joshd can >>>> chime in as he's more familiar with what that code looks like. >>>> >>>> Frankly, I'm a little impressed that without RBD cache we can hit 80K >>>> IOPS from 1 VM! How fast are the SSDs in those 3 OSDs? >>>> >>>> Mark >>>> >>>> On 06/09/2015 03:36 AM, Alexandre DERUMIER wrote: >>>>> It's seem that the limit is mainly going in high queue depth (+- > 16) >>>>> >>>>> Here the result in iops with 1client- 4krandread- 3osd - with differents >>>>> queue depth size. >>>>> rbd_cache is almost the same than without cache with queue depth <16 >>>>> >>>>> >>>>> cache >>>>> ----- >>>>> qd1: 1651 >>>>> qd2: 3482 >>>>> qd4: 7958 >>>>> qd8: 17912 >>>>> qd16: 36020 >>>>> qd32: 42765 >>>>> qd64: 46169 >>>>> >>>>> no cache >>>>> -------- >>>>> qd1: 1748 >>>>> qd2: 3570 >>>>> qd4: 8356 >>>>> qd8: 17732 >>>>> qd16: 41396 >>>>> qd32: 78633 >>>>> qd64: 79063 >>>>> qd128: 79550 >>>>> >>>>> >>>>> ----- Mail original ----- >>>>> De: "aderumier" < aderum...@odiso.com > >>>>> À: "pushpesh sharma" < pushpesh....@gmail.com > >>>>> Cc: "ceph-devel" < ceph-de...@vger.kernel.org >, "ceph-users" < >>>>> ceph-users@lists.ceph.com > >>>>> Envoyé: Mardi 9 Juin 2015 09:28:21 >>>>> Objet: Re: [ceph-users] rbd_cache, limiting read on high iops around 40k >>>>> >>>>> Hi, >>>>> >>>>>>> We tried adding more RBDs to single VM, but no luck. >>>>> >>>>> If you want to scale with more disks in a single qemu vm, you need to use >>>>> iothread feature from qemu and assign 1 iothread by disk (works with >>>>> virtio-blk). >>>>> It's working for me, I can scale with adding more disks. >>>>> >>>>> >>>>> My bench here are done with fio-rbd on host. >>>>> I can scale up to 400k iops with 10clients-rbd_cache=off on a single host >>>>> and around 250kiops 10clients-rbdcache=on. >>>>> >>>>> >>>>> I just wonder why I don't have performance decrease around 30k iops with >>>>> 1osd. >>>>> >>>>> I'm going to see if this tracker >>>>> http://tracker.ceph.com/issues/11056 >>>>> >>>>> could be the cause. >>>>> >>>>> (My master build was done some week ago) >>>>> >>>>> >>>>> >>>>> ----- Mail original ----- >>>>> De: "pushpesh sharma" < pushpesh....@gmail.com > >>>>> À: "aderumier" < aderum...@odiso.com > >>>>> Cc: "ceph-devel" < ceph-de...@vger.kernel.org >, "ceph-users" < >>>>> ceph-users@lists.ceph.com > >>>>> Envoyé: Mardi 9 Juin 2015 09:21:04 >>>>> Objet: Re: rbd_cache, limiting read on high iops around 40k >>>>> >>>>> Hi Alexandre, >>>>> >>>>> We have also seen something very similar on Hammer(0.94-1). We were doing >>>>> some benchmarking for VMs hosted on hypervisor (QEMU-KVM, >>>>> openstack-juno). Each Ubuntu-VM has a RBD as root disk, and 1 RBD as >>>>> additional storage. For some strange reason it was not able to scale 4K- >>>>> RR iops on each VM beyond 35-40k. We tried adding more RBDs to single VM, >>>>> but no luck. However increasing number of VMs to 4 on a single hypervisor >>>>> did scale to some extent. After this there was no much benefit we got >>>>> from adding more VMs. >>>>> >>>>> Here is the trend we have seen, x-axis is number of hypervisor, each >>>>> hypervisor has 4 VM, each VM has 1 RBD:- >>>>> >>>>> >>>>> >>>>> >>>>> VDbench is used as benchmarking tool. We were not saturating network and >>>>> CPUs at OSD nodes. We were not able to saturate CPUs at hypervisors, and >>>>> that is where we were suspecting of some throttling effect. However we >>>>> haven't setted any such limits from nova or kvm end. We tried some CPU >>>>> pinning and other KVM related tuning as well, but no luck. >>>>> >>>>> We tried the same experiment on a bare metal. It was 4K RR IOPs were >>>>> scaling from 40K(1 RBD) to 180K(4 RBDs). But after that rather than >>>>> scaling beyond that point the numbers were actually degrading. (Single >>>>> pipe more congestion effect) >>>>> >>>>> We never suspected that rbd cache enable could be detrimental to >>>>> performance. It would nice to route cause the problem if that is the >>>>> case. >>>>> >>>>> On Tue, Jun 9, 2015 at 11:21 AM, Alexandre DERUMIER < aderum...@odiso.com >>>>> > wrote: >>>>> >>>>> >>>>> Hi, >>>>> >>>>> I'm doing benchmark (ceph master branch), with randread 4k qdepth=32, >>>>> and rbd_cache=true seem to limit the iops around 40k >>>>> >>>>> >>>>> no cache >>>>> -------- >>>>> 1 client - rbd_cache=false - 1osd : 38300 iops >>>>> 1 client - rbd_cache=false - 2osd : 69073 iops >>>>> 1 client - rbd_cache=false - 3osd : 78292 iops >>>>> >>>>> >>>>> cache >>>>> ----- >>>>> 1 client - rbd_cache=true - 1osd : 38100 iops >>>>> 1 client - rbd_cache=true - 2osd : 42457 iops >>>>> 1 client - rbd_cache=true - 3osd : 45823 iops >>>>> >>>>> >>>>> >>>>> Is it expected ? >>>>> >>>>> >>>>> >>>>> fio result rbd_cache=false 3 osd >>>>> -------------------------------- >>>>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>>>> ioengine=rbd, iodepth=32 >>>>> fio-2.1.11 >>>>> Starting 1 process >>>>> rbd engine: RBD version: 0.1.9 >>>>> Jobs: 1 (f=1): [r(1)] [100.0% done] [307.5MB/0KB/0KB /s] [78.8K/0/0 iops] >>>>> [eta 00m:00s] >>>>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=113548: Tue Jun 9 >>>>> 07:48:42 2015 >>>>> read : io=10000MB, bw=313169KB/s, iops=78292, runt= 32698msec >>>>> slat (usec): min=5, max=530, avg=11.77, stdev= 6.77 >>>>> clat (usec): min=70, max=2240, avg=336.08, stdev=94.82 >>>>> lat (usec): min=101, max=2247, avg=347.84, stdev=95.49 >>>>> clat percentiles (usec): >>>>> | 1.00th=[ 173], 5.00th=[ 209], 10.00th=[ 231], 20.00th=[ 262], >>>>> | 30.00th=[ 282], 40.00th=[ 302], 50.00th=[ 322], 60.00th=[ 346], >>>>> | 70.00th=[ 370], 80.00th=[ 402], 90.00th=[ 454], 95.00th=[ 506], >>>>> | 99.00th=[ 628], 99.50th=[ 692], 99.90th=[ 860], 99.95th=[ 948], >>>>> | 99.99th=[ 1176] >>>>> bw (KB /s): min=238856, max=360448, per=100.00%, avg=313402.34, >>>>> stdev=25196.21 >>>>> lat (usec) : 100=0.01%, 250=15.94%, 500=78.60%, 750=5.19%, 1000=0.23% >>>>> lat (msec) : 2=0.03%, 4=0.01% >>>>> cpu : usr=74.48%, sys=13.25%, ctx=703225, majf=0, minf=12452 >>>>> IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.8%, 16=87.0%, 32=12.1%, >=64=0.0% >>>>> 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=91.6%, 8=3.4%, 16=4.5%, 32=0.4%, 64=0.0%, >=64=0.0% >>>>> issued : total=r=2560000/w=0/d=0, short=r=0/w=0/d=0 >>>>> latency : target=0, window=0, percentile=100.00%, depth=32 >>>>> >>>>> Run status group 0 (all jobs): >>>>> READ: io=10000MB, aggrb=313169KB/s, minb=313169KB/s, maxb=313169KB/s, >>>>> mint=32698msec, maxt=32698msec >>>>> >>>>> Disk stats (read/write): >>>>> dm-0: ios=0/45, merge=0/0, ticks=0/0, in_queue=0, util=0.00%, >>>>> aggrios=0/24, aggrmerge=0/21, aggrticks=0/0, aggrin_queue=0, >>>>> aggrutil=0.00% >>>>> sda: ios=0/24, merge=0/21, ticks=0/0, in_queue=0, util=0.00% >>>>> >>>>> >>>>> >>>>> >>>>> fio result rbd_cache=true 3osd >>>>> ------------------------------ >>>>> >>>>> rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, >>>>> ioengine=rbd, iodepth=32 >>>>> fio-2.1.11 >>>>> Starting 1 process >>>>> rbd engine: RBD version: 0.1.9 >>>>> Jobs: 1 (f=1): [r(1)] [100.0% done] [171.6MB/0KB/0KB /s] [43.1K/0/0 iops] >>>>> [eta 00m:00s] >>>>> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=113389: Tue Jun 9 >>>>> 07:47:30 2015 >>>>> read : io=10000MB, bw=183296KB/s, iops=45823, runt= 55866msec >>>>> slat (usec): min=7, max=805, avg=21.26, stdev=15.84 >>>>> clat (usec): min=101, max=4602, avg=478.55, stdev=143.73 >>>>> lat (usec): min=123, max=4669, avg=499.80, stdev=146.03 >>>>> clat percentiles (usec): >>>>> | 1.00th=[ 227], 5.00th=[ 274], 10.00th=[ 306], 20.00th=[ 350], >>>>> | 30.00th=[ 390], 40.00th=[ 430], 50.00th=[ 470], 60.00th=[ 506], >>>>> | 70.00th=[ 548], 80.00th=[ 596], 90.00th=[ 660], 95.00th=[ 724], >>>>> | 99.00th=[ 844], 99.50th=[ 908], 99.90th=[ 1112], 99.95th=[ 1288], >>>>> | 99.99th=[ 2192] >>>>> bw (KB /s): min=115280, max=204416, per=100.00%, avg=183315.10, >>>>> stdev=15079.93 >>>>> lat (usec) : 250=2.42%, 500=55.61%, 750=38.48%, 1000=3.28% >>>>> lat (msec) : 2=0.19%, 4=0.01%, 10=0.01% >>>>> cpu : usr=60.27%, sys=12.01%, ctx=2995393, majf=0, minf=14100 >>>>> IO depths : 1=0.1%, 2=0.1%, 4=0.2%, 8=13.5%, 16=81.0%, 32=5.3%, >=64=0.0% >>>>> 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=95.0%, 8=0.1%, 16=1.0%, 32=4.0%, 64=0.0%, >=64=0.0% >>>>> issued : total=r=2560000/w=0/d=0, short=r=0/w=0/d=0 >>>>> latency : target=0, window=0, percentile=100.00%, depth=32 >>>>> >>>>> Run status group 0 (all jobs): >>>>> READ: io=10000MB, aggrb=183295KB/s, minb=183295KB/s, maxb=183295KB/s, >>>>> mint=55866msec, maxt=55866msec >>>>> >>>>> Disk stats (read/write): >>>>> dm-0: ios=0/61, merge=0/0, ticks=0/8, in_queue=8, util=0.01%, >>>>> aggrios=0/29, aggrmerge=0/32, aggrticks=0/8, aggrin_queue=8, >>>>> aggrutil=0.01% >>>>> sda: ios=0/29, merge=0/32, ticks=0/8, in_queue=8, util=0.01% >>>>> >>>> _______________________________________________ >>>> 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 >>> >>> >>> >>> >>> >>> >>> -- >>> С уважением, Фасихов Ирек Нургаязович >>> Моб.: +79229045757 >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >>> ________________________________ >>> >>> PLEASE NOTE: The information contained in this electronic mail message is >>> intended only for the use of the designated recipient(s) named above. 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