Thanks Niels :) -Vincent
On Feb 19, 2009, at 4:48 PM, Niels Mayer wrote: > Answering my own questions... I added this comment to > http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Performances > > >> NielsMayer | 19.02.2009 at 03:21 PM >> From >> <http://nielsmayer.com/xwiki/bin/view/fedora10/64bitJavaAppletIn64BitFirefox#Comments >> >> > >> http://nielsmayer.com/xwiki/bin/view/fedora10/64bitJavaAppletIn64BitFirefox#Comments >> >> <http://nielsmayer.com/xwiki/bin/view/fedora10/64bitJavaAppletIn64BitFirefox#Comments >> >> > >> >> For info on 6u14's new "Garbage First" GC and potential usefulness >> for use >> with java web apps, see: >> <http://n2.nabble.com/Does-JDK6u14-%22Garbage-First-garbage-collector-%28G1%29%22-work-and-or-improve-Xwiki-performance-size-mem-locality--tp2344358p2344358.html >> >> > >> http://n2.nabble.com/Does-JDK6u14-%22Garbage-First-garbage-collector-%28G1%29%22-work-and-or-improve-Xwiki-performance-size-mem-locality--tp2344358p2344358.htmlor >> <http://n2.nabble.com/forum/PrintPost.jtp?post=2344358> >> http://n2.nabble.com/forum/PrintPost.jtp?post=2344358 (cancel the >> print >> dialog: this gives you the complete message w/o extra crap). >> >> Unfortunately, when running with >> >> VM Arguments: >> jvm_args: -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -Xms256m - >> Xmx768m -XX:PermSize=256m -XX:MaxPermSize=768m - >> Djava.awt.headless=true … >> java_command: org.apache.catalina.startup.Bootstrap start >> >> You get a SIGSEGV (which obviates the whole point of garbage- >> collection): >> >> A fatal error has been detected by the Java Runtime Environment: >> SIGSEGV (0xb) at pc=0x0000000000e9c621, pid=13441, tid=114968912 >> JRE version: 6.0_14-b01 >> Java VM: OpenJDK 64-Bit Server VM (14.0-b10 mixed mode linux-amd64 ) >> Problematic frame: >> V [libjvm.so+0x296621] >> >> The SIGSEGV happens because of new Garbage Collector, as invoked by >> "-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC". It dies after >> running for >> less than an hour: >> >> Current thread (0x000000004149f000): ConcurrentGCThread [stack: >> 0x0000000000000000,0x0000000000000000] [id=13448] >> siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), >> si_addr=0x0000001600000050 >> … >> elapsed time: 2916 seconds >> >> This issue doesn't occur with the default GC invoked with >> >> jvm_args: -Xms256m -Xmx768m -XX:PermSize=256m -XX:MaxPermSize=768m - >> Djava.awt.headless=true" >> >> I guess that's why this is an "Early Access" release. >> > -------------------------- > > also from my previous message re: > >> PS: and will a different GC prevent sequences like this from >> happening?? >> see http://nielsmayer.com/happy-happy-joy-joy.txt > > > This is solved by adding > > -XX:PermSize=256m -XX:MaxPermSize=768m > > although these values are probably far larger than necessary. This > might be > an issue that tomcat affects tomcat users in particular: > > Preventing Java's java.lang.OutOfMemoryError: PermGen space failure > | Eric's > Agile > Answers<http://www.jroller.com/agileanswers/entry/preventing_java_s_java_lang > > > PermGen > Out of Memory — Mifos - Technology that Empowers > Microfinance<http://www.mifos.org/developers/wiki/PermGenOutOfMemory> > re: > running out of permgen memory when deploying/undeploying several > times<http://mail-archives.apache.org/mod_mbox/beehive-user/200506.mbox/%[email protected]%3e > > > > Confluence > out of perm gen space - ADFG Confluence Information - Alaska > Department of > Fish and Game > Confluence<http://www.admin.adfg.state.ak.us/confluence/display/adfgconfinf/Confluence+out+of+perm+gen+space > > > > java.net > Forums : Diagnosing PermGen issues > ...<http://forums.java.net/jive/thread.jspa?threadID=56886> Search > results for out of permgen - > MarkMail<http://markmail.org/message/mox2vsa6txv46npz> Running > out of permgen space - Spring Community > Forums<http://forum.springframework.org/showthread.php?t=54150> > Atlassian > Forums: Running out of PermGen Space > ...<http://forums.atlassian.com/message.jspa?messageID=257245099> > [#JBPAPP-469] > Out of perm-gen memory when deploying applications to the productions > configuration - jboss.org > JIRA<https://jira.jboss.org/jira/browse/JBPAPP-469;jsessionid=C1F0DF8E1FECC365CFD3E6FD8860C636 > > > > Java > JVM GC, PermGen, and Memory > Options<http://www.brokenbuild.com/blog/2006/08/04/java-jvm-gc-permgen-and-memory-options/ > > > > _______________________________________________ _______________________________________________ devs mailing list [email protected] http://lists.xwiki.org/mailman/listinfo/devs
