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Difference between revisions of "Jetty/Howto/Garbage Collection"
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{{Jetty Howto | {{Jetty Howto | ||
| introduction = Tuning the garbage collection of the JVM can greatly improve performance of Jetty. Specifically it can avoid pauses while the system performs full garbage collections. Tuning the GC really depends on the behaviour of the application and needs detailed analysis, however there are general recommendations | | introduction = Tuning the garbage collection of the JVM can greatly improve performance of Jetty. Specifically it can avoid pauses while the system performs full garbage collections. Tuning the GC really depends on the behaviour of the application and needs detailed analysis, however there are general recommendations | ||
| − | | examples = | + | | examples = These options are general to the Sun JVM, and will work in a JDK 6 installation. |
| − | + | ||
| − | These options are general to the Sun JVM, and will work in a JDK 6 installation. | + | |
To print the implicit flags that the JVM is configured with: | To print the implicit flags that the JVM is configured with: | ||
Revision as of 19:50, 23 February 2011
Introduction
Tuning the garbage collection of the JVM can greatly improve performance of Jetty. Specifically it can avoid pauses while the system performs full garbage collections. Tuning the GC really depends on the behaviour of the application and needs detailed analysis, however there are general recommendations
Examples
These options are general to the Sun JVM, and will work in a JDK 6 installation.
To print the implicit flags that the JVM is configured with:
-XX:+PrintCommandLineFlags
To disable explicit GC performed regularly by RMI:
-XX:+DisableExplicitGC
to print the date and time stamps of GC activity with details:
-XX:+PrintGCDateStamps \ -XX:+PrintGCTimeStamps \ -XX:+PrintGCDetails \ -XX:+PrintTenuringDistribution
to log GC details to a file:
-Xloggc:[path/to/gc.log]
or to print GC activity with less detail:
-verbose:gc
To use the concurrent marksweep GC with full GC at 80% old generation full
-XX:+UseConcMarkSweepGC \ -XX:CMSInitiatingOccupancyFraction=80,