[petsc-users] Using factored complex matrices from MUMPS as a preconditioner in PETSC

[Evan Um]

Hi Matt,

Still unclear to me. I go to
https://bitbucket.org/petsc/petsc/addon/pipelines/home#!/ and then
https://bitbucket.org/petsc/petsc/branches/. I don't see any tarred file or
directory named "update-mumps-5.1.1-cntl". Could you explain how to
download the modified version from the site a little bit in detail? Thank
you very much for your help.

Evan




On Wed, Oct 11, 2017 at 1:54 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Tue, Oct 10, 2017 at 10:30 PM, Evan Um <evanum at gmail.com> wrote:
>
>> Dear Hong,
>>
>> I just tried to check PETSC develeoper website but couldn't find the
>> updated dev version with name of hzang/update-mumps-5.1.1-cntl.
>>
>
> Hong means a branch. You get the dev repository and checkout that branch
>
>   git checkout  hzang/update-mumps-5.1.1-cntl
>
>   Thanks,
>
>    Matt
>
>
>> . Could you please let me know the location of the updated dev version?
>> Where do I need to visit to check out the dev version with the new control
>> switches? Thank you very much for your help.
>>
>> Best,
>> Evan
>>
>>
>>
>>
>>
>>
>> On Tue, Oct 3, 2017 at 8:34 AM, Hong <hzhang at mcs.anl.gov> wrote:
>>
>>> Evan,
>>> ICNTL(35) and CNTL(7) are added to petsc-mumps interface in branch
>>> hzhang/update-mumps-5.1.1-cntl
>>>
>>> You may give it a try. Once it passes our regression tests, I'll merge
>>> it to petsc master branch.
>>>
>>> Hong
>>>
>>>
>>> On Sun, Sep 24, 2017 at 8:08 PM, Hong <hzhang at mcs.anl.gov> wrote:
>>>
>>>> I'll check it.
>>>> Hong
>>>>
>>>> On Sun, Sep 24, 2017 at 3:42 PM, Evan Um <evanum at gmail.com> wrote:
>>>>
>>>>> Hi Barry,
>>>>>
>>>>> Thanks for your comments. To activate block low rank (BLR)
>>>>> approximation in MUMPS version 5.1.1, a user needs to turn on the
>>>>> functionality (i.e. ICNTL(35)=1) and specify the tolerance value (e.g.
>>>>> CNTL(7)=1e-4). In PETSC, I think that we can set up ICNTL and CNTL
>>>>> parameters for MUMPS. I was wondering if we can still use BLR approximation
>>>>> for a preconditioner for Krylov solvers.
>>>>>
>>>>> Best,
>>>>> Evan
>>>>>
>>>>>
>>>>> On Sat, Sep 23, 2017 at 6:45 PM, Barry Smith <bsmith at mcs.anl.gov>
>>>>> wrote:
>>>>>
>>>>>>
>>>>>> > On Sep 23, 2017, at 8:38 PM, Evan Um <evanum at gmail.com> wrote:
>>>>>> >
>>>>>> > Dear PETSC Users,
>>>>>> >
>>>>>> > My system matrix comes from finite element modeling and is complex
>>>>>> and unstructured. Its typical size is a few millions-by a few millions. I
>>>>>> wondering if I can use MUMPS parallel direct solver as a preconditioner in
>>>>>> PETSC. For example, I want to pass factored matrices to Krylov iterative
>>>>>> solvers such as QMR. Is there any PETSC+MUMPS example code for the purpose?
>>>>>>
>>>>>>   You don't pass factored matrices you just pass the original matrix
>>>>>> and use -pc_type lu -pc_factor_mat_solver_package mumps
>>>>>>
>>>>>> > Can PETSC call the latest MUMPS that supports block low rank
>>>>>> approximation?
>>>>>>
>>>>>>   No, send us info on it and we'll see if we can add an interface
>>>>>>
>>>>>>
>>>>>> >
>>>>>> > In advance, thank you very much for your comments.
>>>>>> >
>>>>>> > Best,
>>>>>> > Evan
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
>
> --
> 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.caam.rice.edu/~mk51/>
>
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