Difference between revisions of "Java"

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(GC)
(GC)
Line 35: Line 35:
 
   -XX:MaxGCMinorPauseMillis=10 \
 
   -XX:MaxGCMinorPauseMillis=10 \
 
   -XX:GCTimeRatio=200 \
 
   -XX:GCTimeRatio=200 \
   -XX:ParallelGCThreads=2 \
+
   -XX:+UseSerialGC \
 
   -Xms140m -Xmx140m \
 
   -Xms140m -Xmx140m \
 +
 +
* http://stas-blogspot.blogspot.co.uk/2011/07/most-complete-list-of-xx-options-for.html
 +
* https://blog.codecentric.de/en/2013/01/useful-jvm-flags-part-6-throughput-collector/

Revision as of 04:22, 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

Remote Debug Tomcat6

In /usr/sbin/tomcat6:

-Xdebug -Xrunjdwp:transport=dt_socket,address=62277,server=y,suspend=n

GC

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:+UseSerialGC \
  -Xms140m -Xmx140m \