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G1 Collector

In 6u14, a preliminary version of the new Garbage First (G1) garbage collector is included.

Garbage First, or G1, is a low pause, server style garbage collector targeted for multi-processors with large memories. G1's primary advantages over the Concurrent Mark-Sweep (CMS) collector include incremental compaction, better predictability and ease of use.

For using G1, need to specify following command line options:

-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC

The following options can be used to affect G1's behavior:

* To set the max GC pause time goal in milliseconds that G1 will attempt to meet:

-XX:MaxGCPauseMillis=n

* To set the time interval over which GC pauses totaling up to MaxGCPauseMillis may take place:

-XX:GCPauseIntervalMillis=n

Posted at 08:35AM Jul 13, 2009 by poonam in Sun  |  Comments[0]