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/ cassandra/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
