[petsc-dev] Petsc Parallel Matrix Vector Multiplication for Skew-Symmetric Matrix

[Mark Adams]

I guess we still have a MATSBAIJ.
In theory you could modify the MatVec to do skew-symmetric, easily, but
this is such a niche operation (never seen it requested in 20+ years) that
I would not want to put it in the repo.
This would save <2x memory and <2x time. If you have a blocked system then
it would be close to 2x.
You could do this in a branch and just rebase over main to update PETSc.
Forever, or until you can convince us to merge it.

On Wed, Jun 2, 2021 at 3:26 PM Matthew Knepley <knepley at gmail.com> wrote:

> On Wed, Jun 2, 2021 at 3:23 PM Yağmur Aksan <yagmuraksan at gmail.com> wrote:
>
>> Hello,
>>
>> I need a function that parallelly multiplies skew-symmetric matrix and
>> vector. Is there any function that Petsc provides?
>> To do so, I think of using matMult function in Petsc and changing it to
>> work with skew-symmetric matrices. But, I haven't found the implementation
>> of MatMult function. If there isn't any other better option that you can
>> recommend me, could you please tell me the link for the implementation of
>> MatMult function?
>>
>
> Do you want to save memory by using the special format? It will not save
> computing, and the speed improvement can be very small.
>
>   Thanks,
>
>      Matt
>
>
>> Thank you.
>>
> --
> 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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