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  GC Implementation Specifics  (Read 6128 times)
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Offline William

Junior Devvie

No Exit

« Reply #30 - Posted 2004-02-05 05:32:39 »

Depending on how accurate and reliable it is, the MaxGCPauseMillis could be great for real-time applications.
Offline princec

« JGO Spiffy Duke »

Medals: 625
Projects: 3
Exp: 16 years

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« Reply #31 - Posted 2004-02-05 07:27:51 »

This is one of the best bits of news I've heard about the JVM in ages! I think we were clamouring for this about 3 years ago when JGO just started. It's especially helpful to me doing soft realtime TV graphics.

Cas Smiley

Offline Jeff

JGO Coder

Got any cats?

« Reply #32 - Posted 2004-02-06 19:49:50 »

Nice. I was asking for this too but the VM guys never told me they had actually gone and done it!

Ofcouse now we are going to about 165 CN posts about "I set my VM for  a Max pause of 0 because I don't want GC pauses. Why does it now give me Out Of Memory??? "

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Offline erikd

JGO Ninja

Medals: 16
Projects: 4
Exp: 14 years


« Reply #33 - Posted 2004-02-06 23:16:24 »

As I read the notes, I think it doesn't really guarantee that GC won't take more time. It says it's a *hint* that GC should *attempt* to take less than the desired time. Doesn't that mean that if it is on the verge of throwing out of memory exceptions, it will take more time anyway (which would be a Good Thing)? An *attempt* is not guaranteed to succeed is it?

Still nice though  Smiley

Offline princec

« JGO Spiffy Duke »

Medals: 625
Projects: 3
Exp: 16 years

Eh? Who? What? ... Me?

« Reply #34 - Posted 2004-02-07 08:16:45 »

It claims to be able to auto adjust itself depending on how you tune it. So, basically, it would appear that it's highly tuneable, and experimentation per application should yield the desired result.

It's still not an excuse to go creating tons of objects in inner loops yet - I'd wait for escape analysis to make an appearance here - but it lessens the amount of tuning and coding that the developer has to do to get reliable constant framerates, and that's a good thing.

Cas Smiley

Offline NVaidya

Junior Devvie

Java games rock!

« Reply #35 - Posted 2004-02-07 16:33:53 »

Anyone notice any significant performance change between
1.4.2_* and 1.5.0 with respect to pre-1.5.0 language features ? I don't seem to find anything markedly different in a few tests that I have run. But haven't really given the new one a good shakedown yet.

Gravity Sucks !
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