Hi, In your test setup do the KV stores use the SSDs in any way? If not, is this really a fair comparison? If the KV stores can give SSD-like ceph performance (especially latency) without the SSDs, that would be quite good. Cheers, Dan -- Dan van der Ster || Data & Storage Services || CERN IT Department -- June 23 2014 3:18 AM, "Shu, Xinxin" wrote: > Hi all, > > We enabled rocksdb as data store in our test setup (10 osds on two servers, each server has 5 HDDs as osd , 2 ssds as journal , Intel(R) Xeon(R) CPU E31280) and have performance tests for xfs, leveldb and rocksdb (use rados bench as our test tool), the following chart shows details, for write , with small number threads , leveldb performance is lower than the other two backends , from 16 threads point , rocksdb perform a little better than xfs and leveldb , leveldb and rocksdb perform much better than xfs with higher thread number. > > xfs leveldb rocksdb > throughtput latency throughtput latency throughtput latency > 1 thread write 84.029 0.048 52.430 0.076 71.920 0.056 > 2 threads write 166.417 0.048 97.917 0.082 155.148 0.052 > 4 threads write 304.099 0.052 156.094 0.102 270.461 0.059 > 8 threads write 323.047 0.099 221.370 0.144 339.455 0.094 > 16 threads write 295.040 0.216 272.032 0.235 348.849 0.183 > 32 threads write 324.467 0.394 290.072 0.441 338.103 0.378 > 64 threads write 313.713 0.812 293.261 0.871 324.603 0.787 > 1 thread read 75.687 0.053 71.629 0.056 72.526 0.055 > 2 threads read 182.329 0.044 151.683 0.053 153.125 0.052 > 4 threads read 320.785 0.050 307.180 0.052 312.016 0.051 > 8 threads read 504.880 0.063 512.295 0.062 519.683 0.062 > 16 threads read 477.706 0.134 643.385 0.099 654.149 0.098 > 32 threads read 517.670 0.247 666.696 0.192 678.480 0.189 > 64 threads read 516.599 0.495 668.360 0.383 680.673 0.376 > > -----Original Message----- > From: Shu, Xinxin > Sent: Saturday, June 14, 2014 11:50 AM > To: Sushma Gurram; Mark Nelson; Sage Weil > Cc: ceph-devel@xxxxxxxxxxxxxxx; Zhang, Jian > Subject: RE: [RFC] add rocksdb support > > Currently ceph will get stable rocksdb from branch 3.0.fb of ceph/rocksdb , since PR https://github.com/ceph/rocksdb/pull/2 has not been merged , so if you use 'git submodule update --init' to get rocksdb submodule , It did not support autoconf/automake . > > -----Original Message----- > From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-owner@xxxxxxxxxxxxxxx] On Behalf Of Sushma Gurram > Sent: Saturday, June 14, 2014 2:52 AM > To: Shu, Xinxin; Mark Nelson; Sage Weil > Cc: ceph-devel@xxxxxxxxxxxxxxx; Zhang, Jian > Subject: RE: [RFC] add rocksdb support > > Hi Xinxin, > > I tried to compile the wip-rocksdb branch, but the src/rocksdb directory seems to be empty. Do I need toput autoconf/automake in this directory? > It doesn't seem to have any other source files and compilation fails: > os/RocksDBStore.cc:10:24: fatal error: rocksdb/db.h: No such file or directory compilation terminated. > > Thanks, > Sushma > > -----Original Message----- > From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-owner@xxxxxxxxxxxxxxx] On Behalf Of Shu, Xinxin > Sent: Monday, June 09, 2014 10:00 PM > To: Mark Nelson; Sage Weil > Cc: ceph-devel@xxxxxxxxxxxxxxx; Zhang, Jian > Subject: RE: [RFC] add rocksdb support > > Hi mark > > I have finished development of support of rocksdb submodule, a pull request for support of autoconf/automake for rocksdb has been created , you can find https://github.com/ceph/rocksdb/pull/2 , if this patch is ok , I will create a pull request for rocksdb submodule support , currently this patch can be found https://github.com/xinxinsh/ceph/tree/wip-rocksdb . > > -----Original Message----- > From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-owner@xxxxxxxxxxxxxxx] On Behalf Of Mark Nelson > Sent: Tuesday, June 10, 2014 1:12 AM > To: Shu, Xinxin; Sage Weil > Cc: ceph-devel@xxxxxxxxxxxxxxx; Zhang, Jian > Subject: Re: [RFC] add rocksdb support > > Hi Xinxin, > > On 05/28/2014 05:05 AM, Shu, Xinxin wrote: > > >> Hi sage , >> I will add two configure options to --with-librocksdb-static and --with-librocksdb , with --with-librocksdb-static option , ceph will compile the code that get from ceph repository , with --with-librocksdb option , in case of distro packages for rocksdb , ceph will not compile the rocksdb code , will use pre-installed library. is that ok for you ? >> >> since current rocksdb does not support autoconf&automake , I will add autoconf&automake support for rocksdb , but before that , i think we should fork a stable branch (maybe 3.0) for ceph . >> >> >> I'm looking at testing out the rocksdb support as well, both for the OSD and for the monitor based on some issues we've been seeing lately. Any news on the 3.0 fork and autoconf/automake support in rocksdb? >> >> Thanks, >> Mark >> >> >>> -----Original Message----- >>> From: Mark Nelson [mailto:mark.nelson@xxxxxxxxxxx] >>> Sent: Wednesday, May 21, 2014 9:06 PM >>> To: Shu, Xinxin; Sage Weil >>> Cc: ceph-devel@xxxxxxxxxxxxxxx; Zhang, Jian >>> Subject: Re: [RFC] add rocksdb support >>> >>> On 05/21/2014 07:54 AM, Shu, Xinxin wrote: >>> >>>> Hi, sage >>>> >>>> I will add rocksdb submodule into the makefile , currently we want to have fully performance tests on key-value db backend , both leveldb and rocksdb. Then optimize on rocksdb performance. >>>> >>> >>> >>> I'm definitely interested in any performance tests you do here. Last winter I started doing some fairly high level tests on raw leveldb/hyperleveldb/raikleveldb. I'm very interested in what you see with rocksdb as a backend. >>> >>> >>> -----Original Message----- >>> From: Sage Weil [mailto:sage@xxxxxxxxxxx] >>> Sent: Wednesday, May 21, 2014 9:19 AM >>> To: Shu, Xinxin >>> Cc: ceph-devel@xxxxxxxxxxxxxxx >>> Subject: Re: [RFC] add rocksdb support >>> >>> Hi Xinxin, >>> >>> I've pushed an updated wip-rocksdb to github/liewegas/ceph.git that includes the latest set of patches with the groundwork and your rocksdb patch. There is also a commit that adds rocksdb as a git submodule. I'm thinking that, since there aren't any distro packages for rocksdb at this point, this is going to be the easiest way to make this usable for people. >>> >>> If you can wire the submodule into the makefile, we can merge this in so that rocksdb support is in the ceph.com packages on ceph.com. I suspect that the distros will prefer to turns this off in favor of separate shared libs, but they can do this at their option if/when they include rocksdb in the distro. I think the key is just to have both --with-librockdb and --with-librocksdb-static (or similar) options so that you can either use the static or dynamically linked one. >>> >>> Has your group done further testing with rocksdb? Anything interesting to share? >>> >>> Thanks! >>> sage >>> >>> -- >>> 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 >>> >> > > > -- > 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 > -- > 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 > > ________________________________ > > 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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