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Re: [DotGNU]Re: [Mono-list] Mono / C# on PDAs

From: Stefan Matthias Aust
Subject: Re: [DotGNU]Re: [Mono-list] Mono / C# on PDAs
Date: Mon, 25 Nov 2002 23:41:16 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.2b) Gecko/20021016

Gopal V wrote:

Pnet ran a hello world 10k stack and 200k heap  (for IL) with a full
build then .. should be a lot smaller for a trimmed down build ...

Even the most current Java VM from Sun has the problem that each application has its own heap which contains its own copy of the classes, duplicating everything. Normally, this is no problem on desktop PCs but for a PDA with restricted memory, that can become an issue.

Can mono/pnet share system classes (loaded from mscore.dll and other libs) or will it behave like Sun's Java VM?

> I would love to see a Qt# application  running on the zaurus!

If libffi does not work in ARM ... PInvoke is out of the way... Still
someone can write a new ilrun.c embedding QT as a set of internal calls.
And avoid the hassle of porting libffi ...

Some questions: libffi allows to call named functions from shared libraries, right? It's a library unrelated to pnet, right? IIRC, Squeak Smalltalk for Unix also requires libffi for its foreign function interface... You say, it's not yet available for the Zaurus? So using "internal calls" (whatever that is) means to redo the Qt bindings? This could easily become a large amount of work, perhaps larger that porting libffi. Would internal calls also be specific to pnet? Advantageously might be, doing direct C++ (?) calls might be more efficient...

Pnet has a JIT ... but not a native JIT ... pnet JITs IL into a simpler non-polymorphic code called CVM ... Which is a lot faster to run than the direct IL interpreters ...

So, not caring about the politically correctness and/or the pureness of freedom, and assuming, that the same IL code can run with both mono and pnet, it looks like the best way is to start with pnet as this might run right now and then - possibly - switch to mono once there's a native-code-compiling-JIT for the ARM processor.

Thanks for all that info.

Stefan Matthias Aust   // // Inter Deum Et Diabolum Semper Musica Est

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