Re: [eigen] Re: [Blitz-devel] Fork Blitz++?

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 2016-01-20 02:05, Gael Guennebaud wrote:
> Eigen: 0.342062s
>
> Blitz++: 14.6185s
>
> (compiled with gcc 5 -O3 -DNDEBUG -mfma)

I was not surprised that Eigen is faster -- mostly as it uses SIMD.
But I think for a fairer comparison, you should at least initialize the 
values in the Blitz++ implementation (working on uninitialized values 
tends to be slow, if there is a number of NaNs and Infs in the data), 
and probably also compare how big the difference without SIMD would be 
(or with just SSE2/3/4, instead of AVX+FMA).

Christoph


--
 Dipl. Inf., Dipl. Math. Christoph Hertzberg

 Universität Bremen
 FB 3 - Mathematik und Informatik
 AG Robotik
 Robert-Hooke-Straße 1
 28359 Bremen, Germany

 Zentrale: +49 421 178 45-6611

 Besuchsadresse der Nebengeschäftsstelle:
 Robert-Hooke-Straße 5
 28359 Bremen, Germany

 Tel.:    +49 421 178 45-4021
 Empfang: +49 421 178 45-6600
 Fax:     +49 421 178 45-4150
 E-Mail:  chtz@xxxxxxxxxxxxxxxxxxxxxxxx

 Weitere Informationen: http://www.informatik.uni-bremen.de/robotik