Hi Joaquin, > Were both tests run from the same machine at close the same time? Yes. I run the both tests within 30 min. I retried them today. The result was the same as yesterday.
The test run on the same instances and the same Java. Thanks, Yuji On Thu, May 11, 2017 at 3:27 AM, Joaquin Casares <joaq...@thelastpickle.com> wrote: > Hi Yuji, > > Were both tests run from the same machine at close the same time? If not, > noisy neighbors may be affecting your performance on different AWS > instances. > > You should verify that you're using the same version of Java during both > tests. > > Also, ensure that you're using the same test instance (that is not running > Cassandra) to connect to both Cassandra clusters. > > Cheers, > > Joaquin > > Joaquin Casares > Consultant > Austin, TX > > Apache Cassandra Consulting > http://www.thelastpickle.com > > On Wed, May 10, 2017 at 5:01 AM, Yuji Ito <y...@imagine-orb.com> wrote: > >> Hi all, >> >> I'm trying a simple performance test. >> The test requests select operations (CL.SERIAL or CL.QUORUM) by >> increasing the number of threads. >> There is the difference of the performance between C* installed by yum >> and C* which I built by myself. >> What causes the difference? >> >> I use C* 2.2.8. >> One of them was installed by yum (# yum install cassandra22). >> Another was acquired by git from https://github.com/apache/cass >> andra/tree/cassandra-2.2.8 and built it by myself. >> I changed cassandra.yaml to set `commitlog_sync: batch` and >> `commitlog_sync_batch_window_in_ms: 2`. >> >> My environment: >> - a cluster has 3 nodes >> - node: AWS EC2 m4.large with 200 IOPS EBS volume >> - Replication Factor: 3 >> - 10000 rows >> >> Result: >> ** yum >> ==== select (CL.SERIAL) ==== >> threads operations/sec >> 1 188 >> 2 156 >> 4 434 >> 8 396 >> 16 837 >> 32 1176 >> 64 2206 >> 128 4115 >> 256 7272 >> >> ** git >> ==== select (CL.SERIAL) ==== >> threads operations/sec >> 1 192 >> 2 162 >> 4 264 >> 8 446 >> 16 733 >> 32 1114 >> 64 1715 >> 128 2776 >> 256 3920 >> >> ** yum >> ==== select (CL.QUORUM) ==== >> threads operations/sec >> 1 434 >> 2 909 >> 4 1481 >> 8 1904 >> 16 2666 >> 32 3106 >> 64 3555 >> 128 5000 >> 256 9014 >> >> ** git >> ==== select (CL.QUORUM) ==== >> threads operations/sec >> 1 666 >> 2 1538 >> 4 2500 >> 8 3333 >> 16 4210 >> 32 5333 >> 64 6597 >> 128 7356 >> 256 8075 >> >> Thanks, >> Yuji >> >> >
