---------- 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 _______________________________________________ kaffe mailing list kaffe@kaffe.org http://kaffe.org/cgi-bin/mailman/listinfo/kaffe