Use parallel test:-))) 2011/12/15 Kent Tong <freemant2...@yahoo.com>
> Hi, > > I am running a performance test for Cassandra 1.0.5. It can perform about > 1500 business operation (one read+one write to the same row) per second. > However, the CPU is still 85% idle (as shown by vmstat) and the IO > utilization is less than a few percent (as shown by iostat). "nodetool > tpstats" shows basically no active and pending threads. I can run several > such test clients concurrently, achieving the same operations per second > without increasing the hardware utilization. So, why the performance has > reached a plateau while there is still idle hardware resources? > > > Thanks in advance for any idea! >
