performance degeneration from jdk7u2 to jdk7u6?

[Jochen Theodorou]

no one helping me on the assembly analysis?

Am 19.05.2012 09:23, schrieb Jochen Theodorou:
> Hi all,
>
> I was about to get a brand new assembly to ask some questions on the
> list here when I installed the newest available jdk7 update 6. I ran my
> simple Fibonacci test program and noticed that the time it took was
> sudden 4.6s, where it was 3.5s before. This plus 1s doesn't look too god
> to me. Has there been anything special that causes this? I mean before
> the indy version was a little faster than our call site caching, now it
> is a little slower. General java performance seems not to be reduced, so
> I would assume it is special to indy.
>
> See http://rifers.org/paste/show/1702
>
> ... so now... is there sombody who can tell me why my indy version is
> now even slower than my call site version? Sadly I am not really fit
> enough in assembler anymore, especially the one produced by hotspot to
> really read that output. So I have no idea what is wrong.
>
> Two things I should mention... the call to $getCallSiteArray is surplus,
> yes, but that doesn't take much time. The only thing I know that really
> takes a lot of time is the exception guard, but that I have to have
> until I find a way to avoid it.... and the call site version has both as
> well of course. They should not count as satisfying explanation.
>
> bye Jochen
>


-- 
Jochen "blackdrag" Theodorou - Groovy Project Tech Lead
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