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

[Hong]

Evan:
The branch is already merged to master. Just use petsc master branch.
Hong

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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