Re: numeric/ublas ?

From: walter_at_[hidden]
Date: 2001-11-13 17:23:33

--- In boost_at_y..., Toon Knapen <toon.knapen_at_s...> wrote:
> walter_at_g... wrote:
> 
> > --- In boost_at_y..., Toon Knapen <toon.knapen_at_s...> wrote:
> > 
> > ublas is somewhat scattered in the CVS (branch 
matrix_development). 
> > You'll find the odds at:
> 
> [snip]
> 
> but e.g. the includes in the header of test1 refer to "../config.h" 
> which seems incompatible with the directory structure you use in 
boost 
> IMO : There is no subdirectory in the directory where config.h is 
> located ? (I figure you use some other file-structure layout to 
compile 
> the tests?).
 
That's right. We've never changed our first layout.

> Anyway, I'm very interested in using uBlas and could also produce 
> Jamfiles if you like to build the tests automatically.
 
That would be very fine.
 
> (I would suggest 
> moving the ublas on the main branch in that case however as 
otherwise 
> synchronising with the latest Jam developments might be difficult)

I don't know what impact this might have.
 
> > 
> >>And what is the current status of ublas ? 
> >>
> >  
> > Rather advanced, w.r.t. Fortran BLAS functionality, I believe ;-
). We 
> > are still writing docs and try to tune the kernels...
> 
> 
> What is the relation to MTL3.0 development in Boost ?

ublas is our contribution to the delevopment of boost.matrix.
 
> >>Do you use Blas internally for 
> >>performance reasons (I checked but could no see any calls to the 
> >> blas.h header)
> >>
> >  
> > Nope.The template functions in blas.h are used to demonstrate how 
to 
> > emulate Fortran BLAS (see test2). However, if one needs platform 
> > specific tuned BLAS kernels, one could try to partially 
specialize 
> > these.
> 
> I would like to look at making specialisations for using Blas 
internally
> (too have the most performant alternative as long as the C++ 
> implementation is at par with Blas) if it does not collide with the 
> roadmap you have in mind.

That would be an interesting chance to get more performance numbers. 
BTW, which BLAS kernel do you intend to use?
 
Regards
 
Joerg