Difference between revisions of "Java"
From Vague Hope Wiki
(→OpenJDK Heapdump) |
(→GC) |
||
Line 17: | Line 17: | ||
* http://mechanical-sympathy.blogspot.co.uk/2013/07/java-garbage-collection-distilled.html | * http://mechanical-sympathy.blogspot.co.uk/2013/07/java-garbage-collection-distilled.html | ||
* http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html | * http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html | ||
+ | |||
+ | sudo jmap -heap <pid> | ||
java \ | java \ | ||
Line 26: | Line 28: | ||
-XX:+CMSIncrementalMode \ | -XX:+CMSIncrementalMode \ | ||
-XX:+CMSIncrementalPacing \ | -XX:+CMSIncrementalPacing \ | ||
+ | |||
+ | java \ | ||
+ | -verbose:gc \ | ||
+ | -XX:+PrintGCDetails \ | ||
+ | -XX:MaxGCPauseMillis=20 \ | ||
+ | -XX:MaxGCMinorPauseMillis=10 \ | ||
+ | -XX:GCTimeRatio=200 \ | ||
+ | -XX:ParallelGCThreads=2 \ | ||
+ | -Xms140m -Xmx140m \ |
Revision as of 04:19, 4 March 2014
OpenJDK Heapdump
sudo yum install java-1.6.0-openjdk-devel sudo jmap -F -J-d64 -dump:live,format=b,file=/root/heap.bin 2232 sudo jstack -F 2232 > /root/stacks.txt
- http://linux.die.net/man/1/jmap-java-1.6.0-openjdk
- http://www.eclipse.org/mat/
- http://vault.centos.org/6.4/updates/x86_64/Packages/
Remote Debug Tomcat6
In /usr/sbin/tomcat6:
-Xdebug -Xrunjdwp:transport=dt_socket,address=62277,server=y,suspend=n
GC
- http://mechanical-sympathy.blogspot.co.uk/2013/07/java-garbage-collection-distilled.html
- http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html
sudo jmap -heap <pid>
java \ -Xms300m \ -Xmx600m \ -verbose:gc \ -XX:MaxGCPauseMillis=20 \ -XX:+UseConcMarkSweepGC \ -XX:+CMSIncrementalMode \ -XX:+CMSIncrementalPacing \
java \ -verbose:gc \ -XX:+PrintGCDetails \ -XX:MaxGCPauseMillis=20 \ -XX:MaxGCMinorPauseMillis=10 \ -XX:GCTimeRatio=200 \ -XX:ParallelGCThreads=2 \ -Xms140m -Xmx140m \