Speeding up Eclipse (a bit) with +UnlockExperimentalVMOptions

April 30th, 2010 Leave a comment Go to comments

Although Sun’s JVM had this for quite a long time now, you might not know you can turn on some experimental options such as UseFastAccessorMethods and UseG1GC, which is a new garbage collector that uses parallel processors.

This might improve quite a bit your Eclipse’s performance, it improved mine. So try it out and share what did worked for you.

Warning: do NOT turn those flags on at your production environments.

Just add to your -vmargs launching arguments:

eclipse -vmargs

-XX:+UnlockExperimentalVMOptions

-XX:+UseG1GC

-XX:+UseFastAccessorMethods

Some people reported a great improvement in performance, not only in Eclipse, but also in other Java apps. For me it improved a little.

Some people also used other parameters (which didnt worked for my environment).

A complete list of jvm options may be found here, some are interesting like:

-XX:+AggressiveHeap
-XX:+AggressiveOpts
-XX:ParallelGCThreads=2
-XX:ThreadPriorityPolicy=1

Does it works for you? Please comment.

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Comments

  1. vogella says:
    May 1, 2010 at 4:37 am

    Nice! All tips to speed up Eclipse are very welcome.

  2. Martin Dilger says:
    May 2, 2010 at 6:08 pm

    thank you very much for this tip,
    but I can't see any performance-optimization here,
    eclipse runs as always.

  3. ugosan says:
    May 3, 2010 at 2:07 pm

    You are right ^^
    Probably the performance gain here is due to the G1GC garbage collector only.

    I will update the post, thank you for the correction!

  4. ugosan says:
    May 3, 2010 at 2:09 pm

    Did you tried the Aggressive options as well?

    perhaps if you try with: -vmargs -XX:ParallelGCThreads=20 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=31 -XX:+AggressiveOpts

    It uses the old parallel garbage collection, but with some options, try it.
    thank you for the input

  5. Eclipse Helios 3.6 and 3.6.x settings | The JDK Blogger says:
    January 30, 2013 at 2:10 pm

    [...] have been reported in this blog post to potentially speed up Eclipse. See all the JVM options here and also in the official Java Hotspot [...]

    [WORDPRESS HASHCASH] The comment’s server IP (72.232.117.6) doesn’t match the comment’s URL host IP (76.74.254.120) and so is spam.

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