As I mentioned days ago: There exists two points related kvstore perf: 1. The order of image and the strip size are important to performance. Because the header like inode in fs is much lightweight than fd, so the order of image is expected to be lower. And strip size can be configurated to 4kb to improve large io performance. 2. The header cache(https://github.com/ceph/ceph/pull/1649) is not merged, the header cache is important to perf. It's just like fdcahce in FileStore.
As for detail perf number, I think this result based on master branch is nearly correct. When strip-size and header cache are ready, I think it will be better. On Fri, Jun 27, 2014 at 8:44 AM, Sushma Gurram <[email protected]> wrote: > Delivery failure due to table format. Resending as plain text. > > _____________________________________________ > From: Sushma Gurram > Sent: Thursday, June 26, 2014 5:35 PM > To: 'Shu, Xinxin'; 'Mark Nelson'; 'Sage Weil' > Cc: 'Zhang, Jian'; [email protected] > Subject: RE: [RFC] add rocksdb support > > > Hi Xinxin, > > Thanks for providing the results of the performance tests. > > I used fio (with support for rbd ioengine) to compare XFS and RockDB with a > single OSD. Also confirmed with rados bench and both numbers seem to be of > the same order. > My findings show that XFS is better than rocksdb. Can you please let us know > rocksdb configuration that you used, object size and duration of run for > rados bench? > For random writes tests, I see "rocksdb:bg0" thread as the top CPU consumer > (%CPU of this thread is 50, while that of all other threads in the OSD is > <10% utilized). > Is there a ceph.conf config option to configure the background threads in > rocksdb? > > We ran our tests with following configuration: > System : Intel(R) Xeon(R) CPU E5-4620 0 @ 2.20GHz (16 physical cores), HT > disabled, 16 GB memory > > rocksdb configuration has been set to the following values in ceph.conf. > rocksdb_write_buffer_size = 4194304 > rocksdb_cache_size = 4194304 > rocksdb_bloom_size = 0 > rocksdb_max_open_files = 10240 > rocksdb_compression = false > rocksdb_paranoid = false > rocksdb_log = /dev/null > rocksdb_compact_on_mount = false > > fio rbd ioengine with numjobs=1 for writes and numjobs=16 for reads, > iodepth=32. Unlike rados bench, fio rbd helps to create multiple (=numjobs) > client connections to the OSD, thus stressing the OSD. > > rbd image size = 2 GB, rocksdb_write_buffer_size=4MB > ------------------------------------------------------------------- > IO Pattern XFS (IOPs) Rocksdb (IOPs) > 4K writes ~1450 ~670 > 4K reads ~65000 ~2000 > 64K writes ~431 ~57 > 64K reads ~17500 ~180 > > > rbd image size = 2 GB, rocksdb_write_buffer_size=1GB > ------------------------------------------------------------------- > IO Pattern XFS (IOPs) Rocksdb (IOPs) > 4K writes ~1450 ~962 > 4K reads ~65000 ~1641 > 64K writes ~431 ~426 > 64K reads ~17500 ~209 > > I guess theoretically lower rocksdb performance can be attributed to > compaction during writes and merging during reads, but I'm not sure if READs > are lower by this magnitude. > However, your results seem to show otherwise. Can you please help us with > rockdb config and how the rados bench has been run? > > Thanks, > Sushma > > -----Original Message----- > From: Shu, Xinxin [mailto:[email protected]] > Sent: Sunday, June 22, 2014 6:18 PM > To: Sushma Gurram; 'Mark Nelson'; 'Sage Weil' > Cc: '[email protected]'; Zhang, Jian > Subject: RE: [RFC] add rocksdb support > > > 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: [email protected]; 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: [email protected] > [mailto:[email protected]] On Behalf Of Sushma Gurram > Sent: Saturday, June 14, 2014 2:52 AM > To: Shu, Xinxin; Mark Nelson; Sage Weil > Cc: [email protected]; 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: [email protected] > [mailto:[email protected]] On Behalf Of Shu, Xinxin > Sent: Monday, June 09, 2014 10:00 PM > To: Mark Nelson; Sage Weil > Cc: [email protected]; 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: [email protected] > [mailto:[email protected]] On Behalf Of Mark Nelson > Sent: Tuesday, June 10, 2014 1:12 AM > To: Shu, Xinxin; Sage Weil > Cc: [email protected]; 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:[email protected]] >> Sent: Wednesday, May 21, 2014 9:06 PM >> To: Shu, Xinxin; Sage Weil >> Cc: [email protected]; 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:[email protected]] >>> Sent: Wednesday, May 21, 2014 9:19 AM >>> To: Shu, Xinxin >>> Cc: [email protected] >>> 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 [email protected] 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 [email protected] 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 [email protected] 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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If you have received this communication in error, please notify > the sender by telephone or e-mail (as shown above) immediately and destroy > any and all copies of this message in your possession (whether hard copies or > electronically stored copies). > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the > body of a message to [email protected] 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 [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Best Regards, Wheat -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
