At Fri, 25 Sep 2009 10:34:06 -0500, Michael Greene <michael.gre...@gmail.com> wrote: > > Thanks for the results. Perhaps you could shed further light: > Is this a single node system?
Ooops. I'm missing. Nope. It's a cluster. I use a 3 node and ReplicationFactor set to 2. > Is the log level changed from DEBUG to INFO? I'm switching off all logs. > Are the commit log and data directories on the same drive? Yes, all data on same disk. > Are the sets/gets being processed interleaved in parallel, or one then the > other? I'm using 10/25/50 parallel request to cluster. My erlang wrapper send one request to one node and chose node by round robin scheduling. I'm set values with cassandra_ALL and after setting get by cassandra_QUORUM. > Note that writes are ~6x and ~5x slower with those values, and gets are ~50x > and ~20x > slower > > Michael > > On Fri, Sep 25, 2009 at 10:23 AM, Kirill A. Korinskiy > <catap+cassan...@catap.ru> wrote: > > Hello. > > I'm write a small erlang benchmark: cassandra vs simple fs storage and > I have a results: > > fs_storage: > 10: 1732/228633/2873/1128 992/233261/2870/1026 > 25: 4531/35290/6084/632 1786/35292/5969/312 > 50: 4707/311825/13694/4644 1366/382913/14470/5823 > > cassandra: > 10: 69014/424051/145871/28066 9553/427823/141925/29190 > 25: 165500/536108/339736/77173 14846/710370/341819/78694 > 50: 325790/1050753/667931/157962 9865/1033461/676317/160606 > > legends: > parallel request: get set min/max/avg/mad > > So. Cassandra slower ~50 times. > > Ok I change cassandra setting: > > ColumnFamily from UTF8Type to BytesType > MemtableObjectCountInMillions from 0.1 to 1 > ConcurrentReads from 8 to 64 > ConcurrentWrites from 32 to 64 > > And I have: > > fs_storage: > 10: 2164/245375/2515/474 651/247790/2746/800 > 25: 5521/19959/5838/196 1836/20138/5943/186 > 50: 6369/32837/11476/944 1396/32818/11449/876 > > cassandra: > 10: 39931/279903/48463/4812 21378/278782/51477/4526 > 25: 101911/407343/119135/9158 8794/410423/123768/9076 > 50: 209202/429959/238179/12180 7803/442580/244402/13443 > > Cassandra slower ~20 times. > > I's normal? Can I do something wrong? Maybe you have any ideas? > > -- > wbr, Kirill > > -- wbr, Kirill
