It is also important to mention that java7 G1 garbage collector gives much bette... | Hacker News

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tlogan on Dec 20, 2011 | parent | context | favorite | on: Massive Ruby speed boost with JRuby and Java 7.

It is also important to mention that java7 G1 garbage collector gives much better results for certain installations (of course test it before deploying it on production). The pauses are much more predictable and, in my case, much shorter.

Here is how to get Oracle Java7 on Ubuntu:

  wget http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-x64.tar.gz
  tar -xvf jdk-7-linux-x64.tar.gz 
  sudo mkdir -p /usr/lib/jvm/      
  sudo mv jdk1.7.0/ /usr/lib/jvm/
  sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0/jre/bin/java 0
  sudo update-alternatives --config java

headius on Dec 20, 2011 [–]

G1 is definitely an interesting piece of work. It's geared toward very large heaps where you need more predictable pause times, and is intended to replace the concurrent mark/sweep GC.

To enable G1 on Java 7: -XX:+UseG1GC. Prepend -J if passing to the 'jruby' command.

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