[petsc-dev] People spent tim doing this

[Matthew Knepley]

On Fri, Oct 11, 2019 at 12:27 PM Zhang, Hong <hongzhang at anl.gov> wrote:

> It is hard to understand where the speedup comes. What is the difference
> between "manner 1" and "manner 2”?
>

It comes from the really bad implementation in swBLAS. For MAXPY, they just
looped and called AXPY.

   Matt


> Btw, we don’t provide “ELL” format in PETSc. We provide “SELL”, which
> should be more SIMD-friendly than the column-ELL proposed in the paper.
>
> Hong
>
> On Oct 10, 2019, at 8:16 PM, Matthew Knepley via petsc-dev <
> petsc-dev at mcs.anl.gov> wrote:
>
> Thanks,
>
>    Matt
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
> <08560093.pdf>
>
>
>

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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