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Java-Gaming.org > Game Development > Performance Tuning > -Xcomp
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Offline swpalmer

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Where's the Kaboom?
« on: 2003-12-23 16:18:22 »
Just reading some stuff over at TopCoder..
http://www.topcoder.com/rtables/viewThread.jsp?forum=64101&thread=232826&mc=27

and came across this statement:

Quote
From the conversations I've read on -Xcomp - it's pretty much like running a C++ program - you have a static compile up front and run the resulting code (it will NOT attempt any further enhancements nor back-out of bad guesses).


Which led me to ponder...  Does -Xcomp inline anything?  Can methods be inlined later during the run if you use -Xcomp.  

Which comes down to: Is -Xcomp a valid way to benchmark or is it going to give you something too different from what you would get with a 'warmed up' mixed mode run?
Digital Video    Welcome to reality    Sanity
Offline Jeff

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Got any cats?
« Reply #1 on: 2003-12-24 11:59:31 »
He's completely wrong.

All -Xcomp does is reduce the Hotspot threshold for compilation to 0 (compile each method immediately.)

Otherwise ist just like any other compilation Hotspot does.

Moral: Don't believe everything you read, especially on the web.  (see definition below)

Def:  The World Wide Web
The greatest medium ever developed to allow those who know nothing to inform those who know less...   Wink
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Offline swpalmer

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Posts: 3438
Medals: 4


Where's the Kaboom?
« Reply #2 on: 2003-12-24 20:02:26 »
I did doubt the accuracy of that info, which is why I brought it up here... we all know that this side of the web is 100% accurate  Wink
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Offline Jeff

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Posts: 3535


Got any cats?
« Reply #3 on: 2003-12-24 20:09:10 »
Well 98.6% accurate...

I'm wrong every so often.  And I like to think that, once its proven, I'm man enough to accept it Smiley

But here I'm very very sure he's wrong. Smiley
Got a question about Java and game programming?  Just new to the Java Game Development Community?  Try my FAQ.  Its likely you'll learn something!

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