RE: GSoC project about binary packaging

[John D]

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Jordi Gutiérrez Hermoso
Sent: Friday, June 21, 2013 5:03 PM
To: John D
Cc: Michael Goffioul; Octave Maintainers List; Philip Nienhuis; John W. Eaton; 
Anirudha Bose; Ben Abbott
Subject: Re: GSoC project about binary packaging

On 21 June 2013 16:43, John D <address@hidden> wrote:

> OpenBLAS seems to compile ok for native mingw compile, however might 
> be a little flaky on cross builds? I have one linux computer that 
> compiled it fine, another that did not – I hadn’t looked into why.

There's something I don't understand. Most BLASes try at compile time to figure 
out what the optimal build flags are and how to produce the best binary (e.g. 
which vector instructions the CPU supports, etc).
How can this work for distributing a compiled BLAS? Does the OpenBLAS build 
know how to delegate these questions to runtime instead of compile time?

> Also I haven’t looked at what speed differences/advantages there are 
> in using openblas vs blas in octave

You mean vs ATLAS? We haven't shipped a reference BLAS with Octave for a long 
time.

- Jordi G. H.

________________

I was meaning the blas we were compiling against in mingw if openblas isn’t 
used.