CODEWITHSUNDEEP
garbage-collectionjvmg1gc
Stefan Armbruster
Stefan Armbruster

Reputation: 39915

options for G1 garbage collectors not available?

http://www.oracle.com/technetwork/java/javase/tech/g1-intro-jsp-135488.html seems to be the official docs for the G1 garbage collector.

There are two options mentioned:

When configuring tomcat to use G1 with these options, catalina.log shows up

Unrecognized VM option '+G1ParallelRSetUpdatingEnabled'
Could not create the Java virtual machine.

My JVM is

$ java -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)

and

JAVA_OPTS="-server -Djava.awt.headless=true -Xmx3G -Xss512k -XX:MaxPermSize=1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:+G1ParallelRSetUpdatingEnabled -XX:+G1ParallelRSetScanningEnabled"

Any hints why -XX:+G1ParallelRSetScanningEnabled does not work?

Upvotes: 2

Views: 4636

Answers (2)

Florakel
Florakel

Reputation: 1131

G1 was officially introduced by Oracle in Java 7 U4: http://www.oracle.com/technetwork/java/javase/7u4-relnotes-1575007.html

You can find the official documentation here: http://docs.oracle.com/javase/7/docs/technotes/guides/vm/G1.html

and command line options here: http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html#G1Options

Upvotes: 0

haylem
haylem

Reputation: 22663

It's been disabled. See this question and my answer.

The documentation that you are linking to, as its name may or may not clearly suggest, was at the time the introduction of G1 to the world (not introduction as in "starter guide"). Things have evolved since.

Upvotes: 2

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