On 28/02/2008, Andrew John Hughes <[EMAIL PROTECTED]> wrote:
> ---------- Forwarded message ----------
> From: Andrew John Hughes <[EMAIL PROTECTED]>
> Date: 28 Feb 2008 09:51
> Subject: Re: [kaffe] Removed GMP math?
> To: Alan Eliasen <[EMAIL PROTECTED]>
> Cc: kaffe@kaffe.org
>
>
> On 28/02/2008, Alan Eliasen <[EMAIL PROTECTED]> wrote:
> > Jim Pick wrote:
> > > What's New In Kaffe 1.1.9
> > > ----------------------------
> > >
> > > * Removed support for native big math.
> >
> > I have to admit, I was *very* disappointed when I saw this. The fact
> > that Kaffe could use the best-of-breed GMP libraries to perform
> > operations with very large BigIntegers was the sole reason that I used
> > and advocated Kaffe. It was the one place where programs run under
> > Kaffe could be enormously, incredibly faster than other JVMs, often by
> > factors of 1000 or even 100,000. The algorithms that replaced it are
> > *vastly* slower for very large numbers.
> >
> > Why was this done? It constitutes a severe performance regression
> > for many programs, and was already switchable so that it could be
> > compiled in and used or not used at runtime if desired, or completely
> > omitted from compilation if you didn't want it.
> >
> > While I am working very hard at implementing faster algorithms for
> > the OpenJDK project, my best algorithms are still factors of about 100
> > times slower than Kaffe/GMP for many large numbers, and nothing one
> > could do in Java could ever match their performance.
> >
> > How much trouble would it be for whoever removed these parts to
> > revert those changes? I think they were removed without concern for the
> > people who use Kaffe for this very reason, and this reason alone. For
> > me, and the people that use Kaffe/GMP for work in number theory, this is
> > a heartbreaking regression, and one that, quite frankly, makes Kaffe
> > rather unsuitable for my use, as it tends to be about 20-25 times slower
> > than other JVMs for most other programs.
> >
> > --
> > Alan Eliasen | "Furious activity is no substitute
> > [EMAIL PROTECTED] | for understanding."
> > http://futureboy.us/ | --H.H. Williams
> >
> > _______________________________________________
> > kaffe mailing list
> > kaffe@kaffe.org
> > http://kaffe.org/cgi-bin/mailman/listinfo/kaffe
> >
>
>
> Hi Alan,
>
> I obviously can't speak for Dalibor's motives on this, but I believe
> the reason for removing GMP from Kaffe was to reduce the amount of
> maintenance involved. The intention is to instead maintain such class
> library extensions in GNU Classpath itself, so GMP support will be
> added there (thus giving this same performance advantage to many VMs).
>
> On that subject, Dalibor, can you point me at Raif's patch for adding this?
>
> Thanks,
>
> --
> Andrew :-)
>
> Support Free Java!
> Contribute to GNU Classpath and the OpenJDK
> http://www.gnu.org/software/classpath
> http://openjdk.java.net
>
>
> --
> Andrew :-)
>
> Support Free Java!
> Contribute to GNU Classpath and the OpenJDK
> http://www.gnu.org/software/classpath
> http://openjdk.java.net
>
I took Raif's patch, updated it and committed it to GNU Classpath this evening:
2008-02-28 Andrew John Hughes <[EMAIL PROTECTED]>
PR classpath/28664
* include/Makefile.am:
Add generation of header file java_math_VMBigInteger.h
* java/math/BigInteger.java: Separate NativeMPI into
VMBigInteger.
* native/jni/Makefile.am: Add java-math.
* native/jni/java-math/java_math_VMBigInteger.c:
Renamed from java_math_BigInteger.c.
* vm/reference/java/math/VMBigInteger.java:
Former NativeMPI class from java.math.BigInteger.
2006-11-28 Raif S. Naffah <[EMAIL PROTECTED]>
Jeroen Frijters <[EMAIL PROTECTED]>
PR classpath/28664
* configure.ac: Add support for configuring GNU MP.
* native/jni/Makefile.am: Include java-math directory if required.
* native/jni/java-math/.cvsignore: New file.
* native/jni/java-math/Makefile.am: Likewise.
* native/jni/java-math/java_math_BigInteger.c: Likewise.
* java/math/BigInteger.java: Added support for native methods.
* gnu/classpath/Configuration.java.in
(WANT_NATIVE_BIG_INTEGER): New field.
--
Andrew :-)
Document Freedom Day - March 26th
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