Escape Analysis?

[Mr_Light]

Implementation Status
- Java SE 6 has escape analysis and lock elision in the server compiler.
- It is off by default, it can be enabled with  the -XX:+UseEscapeAnalysis flag.
- Java SE 7 will have further optimizations.
- There are currently no plans to release a client compiler with escape analysis.
http://developers.sun.com/learning/javaoneonline/2006/coreplatform/TS-3412.pdf

[arm]

Now Java SE 6 has escape analysis !

Java 6u11  -server -XX:+AggressiveOpts:

    Testing 1.0E7 allocation of an Object   : 208 ms.
    Testing 1.0E7 Local objects allocation (method scope) : 313 ms.
    Testing 1.0E7 allocation of object in a loop  : 433 ms.


Java 6u14  -server -XX:+AggressiveOpts:

    Testing 1.0E7 allocation of an Object   : 61 ms.
    Testing 1.0E7 Local objects allocation (method scope) : 94 ms.
    Testing 1.0E7 allocation of object in a loop  : 79 ms.


You can download it from http://download.java.net/jdk6/binaries.

Regards
                   Angelo

[princec]

Yay! I'll wait for an official release tho'.

Cas

Games published by our own members! Check 'em out!

[bienator]

what you see is probably object vectorization (EA are a precondition for this)
http://blog.juma.me.uk/2008/12/17/objects-with-no-allocation-overhead/

[kappa]

Oh this looks like a significant performance improvement especially for gaming, wonder if it'll ever be enabled by default.

Hopefully we'll see this enabled once two-tier compilation is added. (any news on two tier compilation?)

[GKW]

The main engineer behind tiered compilation died in the middle of last year.  I have not seen any changesets that mention it so I'd guess it's not a high priority.

[Matzon]

oh, crap - is that Steve Goldman ?
http://blogs.sun.com/fatcatair/ - warning nasty eye thingy on front page [size=18pt]warning nasty eye thingy on front page[/size]

[kappa]

oh dear, looks like it was Steve Goldman that passed away. Sad news indeed.

[princec]

And it looks like he did loads more interesting things than tinker with JVMs as well. That is a great shame.

Cas

[oNyx]

oh, crap - is that Steve Goldman ?
http://blogs.sun.com/fatcatair/ - warning nasty eye thingy on front page

Needs bigger warning.

Ew.

Ewww ewww ewww. EWW!

Where is the mind bleach!? :v

Games published by our own members! Check 'em out!

[Matzon]

Needs bigger warning.

Ew.

Ewww ewww ewww. EWW!

Where is the mind bleach!? :v

fixed 

[Mr_Light]

oi, I wish I had a better monitor so the high resolution would make it smaller.