Re: [ublas] How to enable boost numeric binding

Subject: Re: [ublas] How to enable boost numeric binding
From: Oswin Krause (Oswin.Krause_at_[hidden])
Date: 2011-09-22 03:37:51

Hi,

Without knowing your program, i can't really help much. But as far as i
know, these bindings are no "magic". They will not replace your regular
prod(A,x) (which is slow anyways and you should use the axpy_prod instead)
with the bindings. You have to call the functions of the bindings
directly.

When this doesn't give a speed up...well, copying the matrices into other
formats also costs time.

Greetings,
Oswin

> Hello,
> I noticed that ublas is very slow  in sparse matrix matrix and matrix
> vector
> multiplications compared to Mathematica, Eigen and MTL4. I recently found
> the boost-numeric-binding, followed the steps mentioned
> here<http://mathema.tician.de/node/391>,
> but gained no speed !
>
>
> I compile my program as:
> g++ -O3 goUBLAS.cpp
> -I/home/tarek/go/boost-bindings/include/boost-numeric-bindings/
>
> Do I have to change the path of the boost header files in my program?
>
> By the way, When I installed the bindings, I got this message
> for header in `find boost -name '*.hpp' -o -name '*.h'`; do \
>   tgt_dir=~/go/boost-bindings/include/boost-numeric-bindings; \
>    mkdir -p `dirname $tgt_dir/$header`; \
>   cp $header $tgt_dir/$header ; \
>    done
>
> Does it tell me to do extra steps to let the bindings work?
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