Yes thank you. I have read about the OpenJDK issue but unfortunately we are already on Sun JDK.
On Jul 4, 2011, at 6:04 PM, Sebastien Coutu wrote: > It was among one of the issues we had. One of our hosts was using OpenJDK and > we've switched it to Sun and this part of the issue stabilized. The other > issues we had were Heap going through the roof and then OOM under load. > > > On Mon, Jul 4, 2011 at 11:01 AM, Daniel Doubleday <daniel.double...@gmx.net> > wrote: > Just to make sure: > You were seeing that res mem was more than twice of max java heap and that > did change after you tweaked GC settings? > > Note that I am not having a heap / gc problem. The VM itself thinks > everything is golden. > > On Jul 4, 2011, at 3:41 PM, Sebastien Coutu wrote: > >> We had an issue like that a short while ago here. This was mainly happening >> under heavy load and we managed to stabilize it by tweaking the Young/Old >> space ratio of the JVM and by also tweaking the tenuring thresholds/survivor >> ratios. What kind of load to you have on your systems? Mostly reads, writes? >> >> SC >> >> On Mon, Jul 4, 2011 at 6:52 AM, Daniel Doubleday <daniel.double...@gmx.net> >> wrote: >> Hi all, >> >> we have a mem problem with cassandra. res goes up without bounds (well until >> the os kills the process because we dont have swap) >> >> I found a thread that's about the same problem but on OpenJDK: >> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Very-high-memory-utilization-not-caused-by-mmap-on-sstables-td5840777.html >> >> We are on Debian with Sun JDK. >> >> Resident mem is 7.4G while heap is restricted to 3G. >> >> Anyone else is seeing this with Sun JDK? >> >> Cheers, >> Daniel >> >> :/home/dd# java -version >> java version "1.6.0_24" >> Java(TM) SE Runtime Environment (build 1.6.0_24-b07) >> Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode) >> >> :/home/dd# ps aux |grep java >> cass 28201 9.5 46.8 372659544 7707172 ? SLl May24 5656:21 >> /usr/bin/java -ea -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 >> -Xms3000M -Xmx3000M -Xmn400M ... >> >> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >> >> >> 28201 cass 20 0 355g 7.4g 1.4g S 8 46.9 5656:25 java >> >> >> >> > >
