[petsc-users] Question about speed of MatMatSolveTranspose with MUMPS

[Junchao Zhang]

It seems yes, from mump manual


ICNTL(9) computes the solution using A or AT

Phase: accessed by the host during the solve phase.

Possible values :

1    : AX = B is solved.

!= 1 : ATX = B is solved.



On Thu, Aug 4, 2022 at 4:20 PM Barry Smith <bsmith at petsc.dev> wrote:

>
>   Yes, it appears no MUMPS matmatsolvetranspose is wired in. Does MUMPS
> provide such a function? If so it can be added with a few lines of code.
>
>   Barry
>
>
> On Aug 4, 2022, at 3:55 PM, Lucas Banting <bantingl at myumanitoba.ca> wrote:
>
> Hello,
>
> I am using MUMPS to solve a system with multiple right hand sides.
> I have noticed that the MatMatSolve function appears to be quite a bit
> faster than the MatMatSolveTranspose function.
> I was trying to look through the petsc source to see where the
> MatMatSolveTranspose_MUMPS function was but couldn't find it.
>
> Is PETSc just doing MatSolveTranspose_MUMPS for each right hand side when
> doing MatMatSolveTranspose with MUMPS?
> If an accelerated version of MatMatSolveTranspose existed, it would be
> very useful for my application.
>
> Regards,
> Lucas
>
>
>
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