Re: [ublas] [PATCH 3/3] boost::ublas increasing the range of BLAS level 3 benchmarks

Subject: Re: [ublas] [PATCH 3/3] boost::ublas increasing the range of BLAS level 3 benchmarks
From: Nasos Iliopoulos (nasos_i_at_[hidden])
Date: 2016-03-08 12:44:06

Can you run some benchmarks comparing the legacy  with the switching one 
for small size arrays (up to let's say 20x20)?

-Nasos

On 03/07/2016 12:13 PM, palik imre wrote:
> Right now I do run-time switching between the legacy and the 
> gemm-based implementation based on the matrix size.
>
> This incurs a slight overhead because of the extra branch, but this is 
> the best tradeoff I was able to come up.
>
> I'd rather avoid introducing a new function for multiplying matrices, 
> as there are already five ways to do that in ublas.  So it is already 
> way more confusing than it should be.
>
> I could change the branch to a compile-time one for matrix types where 
> compile-time size information is available, but I am unsure of how 
> widely those matrix types are used.  (I've never seen anybody using 
> anything else than vanilla matrix.)  If you (or anybody) would be 
> interested in such a feature, then please let me know.
>
>
> On Monday, 7 March 2016, 17:56, Riccardo Rossi <rrossi_at_[hidden]> 
> wrote:
>
>
> Hi,
>
> just to give my two cents, some care shall be taken so that there is 
> no overhead for very small matrices (say 3*3)
>
> cheers
> Riccardo
>
> On Sun, Mar 6, 2016 at 9:58 PM, palik imre <imre_palik_at_[hidden] 
> <mailto:imre_palik_at_[hidden]>> wrote:
>
>     It just ocured to me, that based on the descriptor struct it would
>     be possible to choose between parallel and serial implementation
>     of the kernels.
>
>     Anybody would be interested in having something like that in ublas?
>
>     Would an OpenMP parallel implementation be accepted to the library?
>
>     Thanks,
>
>     Imre
>
>
>     On Sunday, 6 March 2016, 10:43, palik imre <imre_palik_at_[hidden]
>     <mailto:imre_palik_at_[hidden]>> wrote:
>
>
>     Fork is here:
>     https://github.com/imre-palik/ublas/tree/feature/ublas00004_simd_gemm
>
>     pull request is sent.
>
>
>
>
>
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>
>
>
> -- 
> *Riccardo Rossi
> *
> PhD, Civil Engineer
>
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> <http://www.cimne.com/kratos>
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