Re: [eigen] Parallelizable operations

[joel falcou <joel.falcou@xxxxxx>]

On 29/07/10 14:22, Matthieu Brucher wrote:
> Hi,
>
> I don't think it would be a huge gain, if there is a gain at all. If
> we consider single processor multiple cores, the memory bandwidth is
> shared accross cores. Addition and substraction are meory bandwidth
> limited, so there would only be additional contention and thus less
> performance.Parallelization works best with far more computations than
> memory accesses.
>
> Matthieu
>    
Well, there is a simple model that can be evaluated at compile-time w/r 
to operations cycles count knwown before hand
to decide if parallelization is useful or not.

<shamelessplug>
http://www.springerlink.com/content/l4r4462r25740127/
</shamelessplug>

in NT2 it works OK but then again, we don't have the same compiletime 
constraints