RE: [Sablevm-user] hello

[Alan L. <al...@in...>]

Etienne,

   would you have any hard numbers for a 'reasonable' system?

We are looking for an embeddable JVM ourselves. Kaffe requires a heap =
size of > 1 meg just to do a 'hello world'. How would Sable compare =
against that? (Better I hope!).=20

Do you happen to know if anyone has tried to 'cldc-ise' Sable and what =
kind of footprint that might result in ??

Performance-wise do you have a feel for how Sable might compare against =
the threaded-int version of Kaffe (which I guess just about sets our =
minimum acceptable level of performance) ?

Thanks

Alan




-----Original Message-----
From: sab...@li... =
[mailto:sab...@li...] On Behalf Of Etienne =
Gagnon
Sent: Sunday, April 18, 2004 10:10 AM
To: Vladimir Levin
Cc: sab...@li...
Subject: Re: [Sablevm-user] hello


Vladimir Levin wrote:
> I am looking at using Java for embedded development. I am wondering if
> SableVM is suitable for embedded development? How does it compare to =
GCJ?

SableVM's runtime memory footprint can be pretty low, I guess.  You can =
setup the initial heap size to 0 byte, and the increment to 1 byte, so =
that SableVM will tend to have as small a heap as possible (somewhat).

Also, you can compile it with -Os, to optimize size.  [Many of the m4 =
macros in place to add robustness can be easily modified to expand to =
even smaller code.]

At runtime, the bytecode gets very little expansion (for preparation), =
compared to compiled code (gross figure; some times it's the other way =
around for specific bytecode sequences).

SableVM is a "traditional" kind of JVM; it does no ahead of time =
compiling, not runtime compilation.  It can result in smaller code.  =
But, it will not compete in speed with highly optimized code, or =
adaptive optimization systems such as JikesRVM.

Etienne

--=20
Etienne M. Gagnon, Ph.D.             http://www.info.uqam.ca/~egagnon/
SableVM:                                       http://www.sablevm.org/
SableCC:                                       http://www.sablecc.org/


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