Re: about the computing speed

[Carlo De Falco]

> On Thu, Oct 1, 2015 at 5:10 PM, Carlo De Falco <address@hidden> wrote:
> 
> On 30 Sep 2015, at 11:07, Sungwon Shin <address@hidden> wrote:
> 
> > Should I install any package to compute faster? Or what package is related 
> > to the computing speed of math functions? I'm worrying about that I missed 
> > some package when I installed the dependencies.
> >
> > ex) a=rand(1000,1000);
> >       tic;
> >       inv(a);           <----inverse function
> >       toc*1000
> >
> >
> > thanks
> 
> Hi,
> For the particular example you showed, the computation speed only depends on 
> the BLAS/LAPACK libraries you are linking to.
> What implementation of BLAS/LAPACK are you using?
> c.

On 1 Oct 2015, at 10:37, Sungwon Shin <address@hidden> wrote:

> I installed all dependencies listed in HACKING.txt (including libblas-dev and 
> liblapck-dev) and built octave develop-source.
> should i do something about blas or lapack when I run octave?


Hi,

On this list we prefer bottom-posting to top-posting (see 
https://en.wikipedia.org/wiki/Posting_style), 
please place your answers at the end of the previous message instead of the top.

As for the libraries, I think those you are using are the reference 
implementations which are more
portable but less optimized. 

If you can install an implementation optimized for your specific hardware
that would probably be faster, the most potular among such implementations
right now are ATLAS and OpenBlas.

c.