[petsc-users] PetscSF Fortran interface

Thu Jan 12 13:27:44 CST 2023

Hi Junchao

Going back to this merge request. I'm not sure I follow exactly the usage
described in the commit history. I have a c prototype of what I am trying
to do which is

    PetscSectionCreate(PETSC_COMM_WORLD, &leafSection);
    PetscSFDistributeSection(redistributionSF, filteredSection_local,
&remoteOffsets,
leafSection);
    PetscSFCreateSectionSF(redistributionSF, filteredSection_local,
remoteOffsets, leafSection, &redistributionSF_dof);

But something seems unclear with the usage in fortran around the
remoteoffsets. Do I have to insert the CreateRemoteOffsetsF90 like so? Any
clarification would be greatly appreciated.

call PetscSFDistributeSectionF90(distributionSF, section_filt_l,
remoteoffsets, leafSection, ierr)
call PetscSFCreateRemoteOffsetsf90(distributionSF, section_filt_l,
leafSection, remoteoffsets, ierr )
call PetscSFCreateSectionSFF90(distributionSF, section_filt_l,
remoteoffsets, leafSection, distributionSF_dof, ierr)

Sincerely
Nicholas

On Tue, Jan 10, 2023 at 4:42 PM Junchao Zhang <junchao.zhang at gmail.com>
wrote:

> Hi, Nicholas,
>    It seems we have implemented it, but with another name,
> PetscSFCreateSectionSFF90, see
> https://gitlab.com/petsc/petsc/-/merge_requests/5386
>    Try it to see if it works!
>
> --Junchao Zhang
>
>
> On Tue, Jan 10, 2023 at 11:45 AM Nicholas Arnold-Medabalimi <
> narnoldm at umich.edu> wrote:
>
>> Er to be honest I still can't get my stub to compile properly, and I
>> don't know how to go about making a merge request. But here is what I am
>> attempting right now. Let me know how best to proceed
>>
>>
>> Its not exactly clear to me how to setup up the remote offset properly.
>>
>> in src/vec/is/sf/interface/ftn-custom/zsf.c
>>
>> PETSC_EXTERN void petscsfcreatesectionsf(PetscSF *sf, PetscSection
>> *rootSection, F90Array1d *aremoteOffsets, PetscSection *leafSection,
>> PetscSF *sectionSF, int * ierr PETSC_F90_2PTR_PROTO(remoteoffsetsd))
>> {
>>
>>   int * remoteOffsets;
>>   *ierr = F90Array1dAccess(aremoteOffsets, PETSC_INT, (void**)
>> &remoteOffsets PETSC_F90_2PTR_PARAM(remoteoffsetsd));if (*ierr) return;
>>   *ierr = PetscSFCreateSectionSF(*sf,*rootSection,
>> &remoteOffsets,*leafSection,*sectionSF);if (*ierr) return;
>>
>> }
>>
>> This is the sticking point.
>>
>> Sincerely
>> Nicholas
>>
>>
>> On Tue, Jan 10, 2023 at 12:38 PM Junchao Zhang <junchao.zhang at gmail.com>
>> wrote:
>>
>>> Hi, Nicholas,
>>>   Could you make a merge request to PETSc and then our Fortran experts
>>> can comment on your MR?
>>>   Thanks.
>>>
>>> --Junchao Zhang
>>>
>>>
>>> On Tue, Jan 10, 2023 at 11:10 AM Nicholas Arnold-Medabalimi <
>>> narnoldm at umich.edu> wrote:
>>>
>>>> Hi Junchao
>>>>
>>>> I think I'm almost there, but I could use some insight into how to use
>>>> the PETSC_F90_2PTR_PROTO and F90Array1dAccess for the remoteOffset
>>>> parameter input so if another function comes up, I can add it myself
>>>> without wasting your time.
>>>> I am very grateful for your help and time.
>>>>
>>>> Sincerely
>>>> Nicholas
>>>>
>>>> On Tue, Jan 10, 2023 at 10:55 AM Junchao Zhang <junchao.zhang at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi, Nicholas,
>>>>>    I am not a fortran guy, but I will try to add
>>>>> petscsfcreatesectionsf.
>>>>>
>>>>>    Thanks.
>>>>> --Junchao Zhang
>>>>>
>>>>>
>>>>> On Tue, Jan 10, 2023 at 12:50 AM Nicholas Arnold-Medabalimi <
>>>>> narnoldm at umich.edu> wrote:
>>>>>
>>>>>> I think it should be something like this, but I'm not very fluent in
>>>>>> Fortran C interop syntax. Any advice would be appreciated. Thanks
>>>>>>
>>>>>> PETSC_EXTERN void petscsfcreatesectionsf(PetscSF *sf, PetscSection *
>>>>>> rootSection, F90Array1d *aremoteOffsets, PetscSection *leafSection,
>>>>>> PetscSF *sectionSF, int * ierr PETSC_F90_2PTR_PROTO(remoteoffsetsd))
>>>>>> {
>>>>>>
>>>>>>   int * remoteOffsets;
>>>>>>   *ierr = F90Array1dAccess(aremoteOffsets, PETSC_INT, (void**) &
>>>>>> remoteOffsets PETSC_F90_2PTR_PARAM(remoteoffsetsd));if (*ierr) return
>>>>>> ;
>>>>>>   *ierr = PetscSFCreateSectionSF(*sf,*rootSection, &remoteOffsets,*
>>>>>> leafSection,*sectionSF);if (*ierr) return;
>>>>>>
>>>>>> }
>>>>>>
>>>>>> On Mon, Jan 9, 2023 at 11:41 PM Nicholas Arnold-Medabalimi <
>>>>>> narnoldm at umich.edu> wrote:
>>>>>>
>>>>>>> Hi Junchao
>>>>>>>
>>>>>>> Thanks again for your help in November. I've been using the your
>>>>>>> merge request branch quite heavily. Would it be possible to add a
>>>>>>> petscsfcreatesectionsf interface as well?
>>>>>>> I'm trying to write it myself using your commits as a guide but I
>>>>>>> have been struggling with handling the section parameter properly.
>>>>>>>
>>>>>>> Sincerely
>>>>>>> Nicholas
>>>>>>>
>>>>>>> On Sat, Nov 19, 2022 at 9:44 PM Junchao Zhang <
>>>>>>> junchao.zhang at gmail.com> wrote:
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Sat, Nov 19, 2022 at 8:05 PM Nicholas Arnold-Medabalimi <
>>>>>>>> narnoldm at umich.edu> wrote:
>>>>>>>>
>>>>>>>>> Hi
>>>>>>>>>
>>>>>>>>> Thanks, this is awesome. Thanks for the very prompt fix. Just one
>>>>>>>>> question: will the array outputs on the fortran side copies (and need to be
>>>>>>>>> deallocated) or direct access to the dmplex?
>>>>>>>>>
>>>>>>>> Direct access to internal data;  no need to deallocate
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Sincerely
>>>>>>>>> Nicholas
>>>>>>>>>
>>>>>>>>> On Sat, Nov 19, 2022 at 8:21 PM Junchao Zhang <
>>>>>>>>> junchao.zhang at gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Hi, Nicholas,
>>>>>>>>>>   See this MR,
>>>>>>>>>> https://gitlab.com/petsc/petsc/-/merge_requests/5860
>>>>>>>>>>   It is in testing, but you can try branch
>>>>>>>>>> jczhang/add-petscsf-fortran to see if it works for you.
>>>>>>>>>>
>>>>>>>>>>   Thanks.
>>>>>>>>>> --Junchao Zhang
>>>>>>>>>>
>>>>>>>>>> On Sat, Nov 19, 2022 at 4:16 PM Nicholas Arnold-Medabalimi <
>>>>>>>>>> narnoldm at umich.edu> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hi Junchao
>>>>>>>>>>>
>>>>>>>>>>> Thanks. I was wondering if there is any update on this. I may
>>>>>>>>>>> write a small interface for those two routines myself in the interim but
>>>>>>>>>>> I'd appreciate any insight you have.
>>>>>>>>>>>
>>>>>>>>>>> Sincerely
>>>>>>>>>>> Nicholas
>>>>>>>>>>>
>>>>>>>>>>> On Wed, Nov 16, 2022 at 10:39 PM Junchao Zhang <
>>>>>>>>>>> junchao.zhang at gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Hi, Nicholas,
>>>>>>>>>>>>   I will have a look and get back to you.
>>>>>>>>>>>>   Thanks.
>>>>>>>>>>>> --Junchao Zhang
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Wed, Nov 16, 2022 at 9:27 PM Nicholas Arnold-Medabalimi <
>>>>>>>>>>>> narnoldm at umich.edu> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> Hi Petsc Users
>>>>>>>>>>>>>
>>>>>>>>>>>>> I'm in the process of adding some Petsc for mesh management
>>>>>>>>>>>>> into an existing Fortran Solver. It has been relatively straightforward so
>>>>>>>>>>>>> far but I am running into an issue with using PetscSF routines. Some like
>>>>>>>>>>>>> the PetscSFGetGraph work no problem but a few of my routines require the
>>>>>>>>>>>>> use of PetscSFGetLeafRanks and PetscSFGetRootRanks and those don't seem to
>>>>>>>>>>>>> be in the fortran interface and I just get a linking error. I also don't
>>>>>>>>>>>>> seem to see a PetscSF file in the finclude. Any clarification or assistance
>>>>>>>>>>>>> would be appreciated.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Sincerely
>>>>>>>>>>>>> Nicholas
>>>>>>>>>>>>>
>>>>>>>>>>>>> --
>>>>>>>>>>>>> Nicholas Arnold-Medabalimi
>>>>>>>>>>>>>
>>>>>>>>>>>>> Ph.D. Candidate
>>>>>>>>>>>>> Computational Aeroscience Lab
>>>>>>>>>>>>> University of Michigan
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> Nicholas Arnold-Medabalimi
>>>>>>>>>>>
>>>>>>>>>>> Ph.D. Candidate
>>>>>>>>>>> Computational Aeroscience Lab
>>>>>>>>>>> University of Michigan
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Nicholas Arnold-Medabalimi
>>>>>>>>>
>>>>>>>>> Ph.D. Candidate
>>>>>>>>> Computational Aeroscience Lab
>>>>>>>>> University of Michigan
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Nicholas Arnold-Medabalimi
>>>>>>>
>>>>>>> Ph.D. Candidate
>>>>>>> Computational Aeroscience Lab
>>>>>>> University of Michigan
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Nicholas Arnold-Medabalimi
>>>>>>
>>>>>> Ph.D. Candidate
>>>>>> Computational Aeroscience Lab
>>>>>> University of Michigan
>>>>>>
>>>>>
>>>>
>>>> --
>>>> Nicholas Arnold-Medabalimi
>>>>
>>>> Ph.D. Candidate
>>>> Computational Aeroscience Lab
>>>> University of Michigan
>>>>
>>>
>>
>> --
>> Nicholas Arnold-Medabalimi
>>
>> Ph.D. Candidate
>> Computational Aeroscience Lab
>> University of Michigan
>>
>

-- 
Nicholas Arnold-Medabalimi

Ph.D. Candidate
Computational Aeroscience Lab
University of Michigan
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