19 Feb
2009
19 Feb
'09
4:55 p.m.
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
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/…
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=C1F0DF8E1F…
Java
JVM GC, PermGen, and Memory
Options<http://www.brokenbuild.com/blog/2006/08/04/java-jvm-gc-permgen-a…
_______________________________________________
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…
<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%…
<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…