We currently use storm 0.9.2 and upgraded from Redhat Enterprise Linux 4 to Redhat Enterprise Linux 6. After the upgrade, we saw that the CPU usage when the system is idle is a lot higher on the new system. It's now around ~55%, when it was around ~14% on RHEL4 with the same topology. Looking at the threads using the CPU, there is no single thread using a lot of CPU, but the CPU usage is distributed between many threads. Increasing " topology.sleep.spout.wait.strategy.time.ms" from 1 to 25 ms helped to bring down the CPU from ~55% to ~30% with no single thread using more than 1.4% CPU (most are using 0.3%).
Has anybody seen something similar? If you are using RHEL6, have you seen higher than expected CPU for an idle worker? Is this expected? Thanks, Dennis
