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Re: [Help-gsl] Performance issue with ODE solvers

From: Brian Gough
Subject: Re: [Help-gsl] Performance issue with ODE solvers
Date: Sun, 06 Jan 2008 21:36:18 +0000
User-agent: Wanderlust/2.14.0 (Africa) Emacs/22.1 Mule/5.0 (SAKAKI)

At Wed, 2 Jan 2008 17:51:57 +0100,
Jochen Küpper wrote:
> Sebastien,
> have you received any replies, comments?
> Do you meanwhile have more information on the issue?
> Have people made similar observations for other problems?

The main thing I'd need to know before looking at it more is how the
user-specified error tolerances are used by each package -- otherwise
it's not clear that the runtimes can be compared on a like-for-like
basis. If that is ok, it may be that GSL routines are overestimating
the error, and hence taking smaller steps.

> Sundials is BSD licensed - are there ways to (legally) incorporate it  
> into GSL? Brian, how would we proceed to ask the original authors for  
> a contribution to GSL? What's your opinion on that?

The license is compatible, so it can be used side-by-side with GSL as
an independent packages.  I think that is the best way to use it.

> On the other hand, there are several articles in scientific journals,  
> including a long one in ACM TOMS. Anybody up to implementing it in  
> GSL based on these descriptions? Actually, if no-one is taking up on  
> it, maybe with a found background in ODEs could mentor this as a  
> Google summer of code project?

If somebody wanted to implement some of the algorithms in the GSL
framework that would be cool.

Brian Gough

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