Did you disable THP? If you didn't, it would be better to give it a try. (Sorry, but I don't find a relationship between these, but THP shows CPU issues from many places.) https://twitter.com/mattsta/status/529327782351097856
2015-03-16 8:03 GMT+09:00 Dennis Cammer <[email protected]>: > I haven't heard anything back on this. Does anybody else see the worker > process using 25-50% of one CPU when the system is completely idle when > using RHEL6 or CentOS 6? Is that expected? I'd also appreciate a "no, I > don't see that". > > Thanks, > Dennis > > On Thu, Mar 12, 2015 at 3:34 AM, Dennis Cammer <[email protected]> > wrote: > >> 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 >> > > -- Name : 임 정택 Blog : http://www.heartsavior.net / http://dev.heartsavior.net Twitter : http://twitter.com/heartsavior LinkedIn : http://www.linkedin.com/in/heartsavior
