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: Riccardo Rossi (rrossi_at_[hidden])
Date: 2016-03-08 16:45:30

Nope, I use bounded_matrices when I know the size at compile time.

But most often I only know it at runtime

Simple implementations are the best... Important thing is not to have ifs
at runtime

Can t u create a LargeMatrix class where you do the complicated things and
leave the Matrix class nice and simple?

Cheers
Riccardo
On 8 Mar 2016 22:04, "palik imre" <imre_palik_at_[hidden]> wrote:

> I don't plan to enable openmp by default, just provide some infrastructure
> for the user to explicitly enable it.
>
> As for your case, for 10x10 matrices it doesn't even worth to use gemm.
> Would bounded matrices work for you?  If the bounds are below the breakeven
> point for gemm (set to 27 for double currently), I could arrange for a
> compile-time switch.
>
>
> On Tuesday, 8 March 2016, 19:13, Riccardo Rossi <rrossi_at_[hidden]>
> wrote:
>
>
> Well the problem is that fixed matrices and vectors can not be used if you
> don t know the size at compile time
> In my application (finite elements) I have Millons of matrices of size
> around 10by 10 on which I operate within outer openmp loops.
> Having openmp in the matrix would be a killer for me
> Riccardo
> On 7 Mar 2016 18:13, "Nasos Iliopoulos" <nasos_i_at_[hidden]> wrote:
>
> That is correct,
> there are various options here but none is optimal. Do you have any
> suggestions?
>
> Note: we now have fixed_vector and fixed_matrix classes than can be used
> to make compile time decisions with respect to size.
>
>
> -Nasos
>
> On 03/07/2016 11:56 AM, Riccardo Rossi 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]> 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]>
> 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 *
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>
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