hg: hsx/hsx16/baseline: 6909480: Disable Escape Analysis in jdk6u18

Ben Evans ben.evans at db.com
Sat Dec 12 04:20:48 PST 2009

Osvaldo Doederlein <opinali at gmail.com> wrote on 11/12/2009 15:50:29:

> I support Ben's request - this wouldn't be the first time that 
> unstable, beta-quality features are backported to production JDKs. I
> remember the G1 backport to JDK 6u14 - I've tested it, and found it 
> very far from adequate for production use; confirmed by the large 
> number of G1 changes (not only fixes) that followed in further JDK7 
> builds. Still it was available (jut not enabled by default) in a 
> production JDK, which is good so interested developers like me could
> test it. 

Agreed, but I have to say that I do understand the point of view that 
things should be released when ready and not before.

I also want to take this opportunity to thank the hotspot engineers - the
trend of continual incremental performance improvements in hotspot 
has certainly not gone unnoticed here, and is greatly appreciated.

> btw I have high hopes that 6u18's G1 will be 
> the first I can put in production.)

A word of caution: I was still able to semi-reliably trigger segfaults 
in a 6u18 beta with G1 during my last test cycle of it a month or so ago.

When 6u18 goes gold I'll rerun the tests and see if they still persist 
let the group know the results).


Ben Evans
eFX Algorithmic Trading
Deutsche Bank, London
Office: +44 (0)20 7541 3953


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