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  RTSJ or JSR-000001  (Read 2164 times)
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Offline zingbat

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« Posted 2006-10-05 14:29:26 »

What is this stuff exactly? It looks like a bunch of good ideas for real-time applications that were never implemented by any jvm in pratice.

http://jcp.org/aboutJava/communityprocess/first/jsr001/index.html

http://java.sun.com/javase/technologies/realtime.jsp
Offline shawnkendall

Senior Devvie





« Reply #1 - Posted 2006-10-05 17:24:15 »

What is this stuff exactly? It looks like a bunch of good ideas for real-time applications that were never implemented by any jvm in pratice.

http://jcp.org/aboutJava/communityprocess/first/jsr001/index.html

http://java.sun.com/javase/technologies/realtime.jsp

It is good stuff...
And it did get fully implemented.... in the JVM in MY MIND! WAHAHAHAHHA!

Shawn Kendall
Cosmic Interactive, LLC
http://www.facebook.com/BermudaDash
Offline zingbat

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Java games rock!


« Reply #2 - Posted 2006-10-05 20:15:22 »

Actualy i noticed this RTSJ thing when you put a link to Javolution in the Tools forum. That api claims to be RTJS compliant .

Quote
    *   Safe/transparent object recycling (faster than memory recycling, aka GC).
    * Fast/easy parallel computing support with concurrent contexts.
    * High performance and real-time compliant util / lang / text / io / xml base classes.
    * Struct and Union base classes for direct interfacing with native applications.
    * Java fastest xml parsing and marshalling/unmarshalling facility.

The safe transparency object recycling thing is suposed to be some trick that works as if we were allocating objects on the stack in C++.
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Offline CaptainJester

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Make it work; make it better.


« Reply #3 - Posted 2006-10-06 14:48:29 »

Sun has implemented a JVM with this.  However, you have to pay for it.

Offline zingbat

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Java games rock!


« Reply #4 - Posted 2006-10-06 18:06:06 »

Bastards!
Offline CommanderKeith
« Reply #5 - Posted 2006-10-07 05:48:35 »

But these Real-Time programmers are more concerned with determinism/predictability as a priority, rather than just performance- that's what I read in the 'Dreams' section.

So they wouldn't like the GC-pauses or hotpsot dynamic compilation pauses, but so long as they're really short, isn't it better for us to have better over-all performance with a small startup time?  As far as I know that's the way the client JVM has gone - dynamic hotspot compilation at bottlenecks only & dynamic GC'ing (I imagine that static GC'ing is possible too - ie without a GC thread).

It's interesting how they say that a hardware JVM is possible.  It's a one-liner in the 'Dreams' section.  That would be awesome, imagine a hardware JVM console - the JBox or the JayStation!  Cool

Offline Mr_Light

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shiny.


« Reply #6 - Posted 2006-10-07 14:49:56 »

don't forget the Jii sounds very urban like: ey, what up Jii!

It's harder to read code than to write it. - it's even harder to write readable code.

The gospel of brother Riven: "The guarantee that all bugs are in *your* code is worth gold." Amen brother a-m-e-n.
Offline zingbat

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Java games rock!


« Reply #7 - Posted 2006-10-07 15:47:58 »

"(I imagine that static GC'ing is possible too - ie without a GC thread)"

To make the JVM deterministic the only thing we need is an option control the gc programaticaly but this isn't a big issue since the gc already does a good job by itself.

There are other issues like the latency time that occurs when switching a thread. Aparently this is affected by the os kernel the jvm runs on and theres not much to do about it. It affects c++ games and java games equaly.

The thing that i miss more are structs/unions and stack allocated objects.
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