Re: octave + mkl

[Joshua Dillon]

Also--I'm on a quad core i5 2405 so that probably explains the 4x speed-up.

On Wed, May 16, 2012 at 1:28 PM, Joshua Dillon <address@hidden> wrote:
> It's no skin off my nose.  I just thought it would be helpful to
> others who'd like to match Matlab's speed.
>
> My *VERY* informal timing of MKL+octave shows it to be exactly the
> same speed as Matlab for "standard" operations like eig and eigs.
> Indeed, matlab uses MKL for these operations.
>
> %Octave 3.7.0+ w/MKL:
>>> X=rand(1000);
>>> tic;eig(X);toc
> Elapsed time is 0.967732 seconds.
>
> %Octave 3.2.4 w/o MKL:
>>> X=rand(1000);
>>> tic;eig(X);toc
> Elapsed time is 4.09906 seconds.
>
> %Matlab r2011b:
>>> X=rand(1000);
>>> tic;eig(X);toc
> Elapsed time is 0.986376 seconds.
>
> I confirmed this over many runs and other operations but didn't save
> the results.  As I said, I'm just trying to let others know how to do
> this.
>
> Cheers,
>
> Josh
>
>
> On Wed, May 16, 2012 at 1:16 PM, Sergei Steshenko <address@hidden> wrote:
>>
>>
>>
>>
>> ----- Original Message -----
>>> From: Jordi Gutiérrez Hermoso <address@hidden>
>>> To: Joshua Dillon <address@hidden>
>>> Cc: address@hidden
>>> Sent: Wednesday, May 16, 2012 10:40 PM
>>> Subject: Re: octave + mkl
>>>
>>> On 16 May 2012 15:12, Joshua Dillon <address@hidden> wrote:
>>>>  I don't have time to disseminate this information, but it might be
>>>>  nice to add a howto build octave with MKL support in the FAQ.
>>>
>>> We really don't want to be promoting non-free software in the Octave
>>> mailing lists or wiki. What is MKL doing that we can't be doing
>>> instead in ATLAS or OpenBLAS?
>>>
>>> - Jordi G. H.
>>
>> MKL probably works faster.
>>
>> If so, end users care much more about performance than about ideology.
>>
>> End users, as long as they don't distribute Octave, have full right to 
>> combine free and non-free SW inside their version of Octave (of course, 
>> provided non-free SW license doesn't prohibit using it with free SW).
>>
>> It's very good there are people who promote ways to build faster Octave - 
>> despite your ideological objections.
>>
>> FWIW, 'ffmpeg' developers are much more tolerant - they explicitly allow in 
>> 'configure' to choose non-free components, they just remind that such a 
>> 'ffmpeg' built with non-free pieces can't be distributed.
>>
>> Regards,
>>   Sergei.
>
>
>
> --
> Joshua V. Dillon, Ph.D.
> Software Engineer, Google Inc.
> 650-404-7120 / address@hidden / http://www.almostsure.com
> "If you work really hard and you're kind, amazing things will happen."
>    -- Conan O'Brien



-- 
Joshua V. Dillon, Ph.D.
Software Engineer, Google Inc.
650-404-7120 / address@hidden / http://www.almostsure.com
"If you work really hard and you're kind, amazing things will happen."
   -- Conan O'Brien