[petsc-users] PCFieldSplitSetSchurPre in fortran

Wed Sep 3 07:00:03 CDT 2014

Matt,

Thanks for the fix. If I understand correctly, in an existing
install of petsc-3.5.1, I would only need to replace the
file "finclude/petscpc.h" by the new file for the fix to
work? (instead of downloading dev, configuring, installing on
various machines).

Chris

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________________________________
From: Matthew Knepley <knepley at gmail.com>
Sent: Tuesday, September 02, 2014 5:42 PM
To: Klaij, Christiaan
Cc: petsc-users at mcs.anl.gov
Subject: Re: [petsc-users] PCFieldSplitSetSchurPre in fortran

On Tue, Sep 2, 2014 at 2:08 AM, Klaij, Christiaan <C.Klaij at marin.nl<mailto:C.Klaij at marin.nl>> wrote:

Matt,

Attached is a small Fortran code that replicates the second problem.

This was a Fortran define problem. I fixed it on next

  https://bitbucket.org/petsc/petsc/branch/knepley/fix-pc-fieldsplit-fortran

and it will be in maint and master tomorrow.

  Thanks,

     Matt

Chris

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dr. ir. Christiaan Klaij

CFD Researcher

Research & Development

MARIN

        2, Haagsteeg

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________________________________
From: Klaij, Christiaan
Sent: Friday, August 29, 2014 4:42 PM
To: Matthew Knepley
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>
Subject: RE: [petsc-users] PCFieldSplitSetSchurPre in fortran

Matt,

The small test code (ex70) is in C and it works fine, the problem
happens in a big Fortran code. I will try to replicate the
problem in a small Fortran code, but that will take some time.

Chris

________________________________
From: Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>>
Sent: Friday, August 29, 2014 4:14 PM
To: Klaij, Christiaan
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] PCFieldSplitSetSchurPre in fortran

On Fri, Aug 29, 2014 at 8:55 AM, Klaij, Christiaan <C.Klaij at marin.nl<mailto:C.Klaij at marin.nl>> wrote:
I'm trying PCFieldSplitSetSchurPre with
PC_FIELDSPLIT_SCHUR_PRE_SELFP in petsc-3.5.1 using fortran.

The first problem is that PC_FIELDSPLIT_SCHUR_PRE_SELFP seems to
be missing in fortran, I get the compile error:

This name does not have a type, and must have an explicit type.   [PC_FIELDSPLIT_SCHUR_PRE_SELFP]

while compilation works fine with _A11, _SELF and _USER.

Mark Adams has just fixed this.

The second problem is that the call doesn't seem to have any
effect. For example, I have

CALL PCFieldSplitSetSchurPre(pc,PC_FIELDSPLIT_SCHUR_PRE_USER,aa,ierr)
CALL PCFieldSplitSetSchurFactType(pc,PC_FIELDSPLIT_SCHUR_FACT_LOWER,ierr)

This compiles and runs, but ksp_view tells me

PC Object:(sys_) 3 MPI processes
  type: fieldsplit
    FieldSplit with Schur preconditioner, factorization LOWER
    Preconditioner for the Schur complement formed from A11

So changing the factorization from the default FULL to LOWER did
work, but changing the preconditioner from A11 to USER didn't.

I've also tried to run directly from the command line using

-sys_pc_fieldsplit_schur_precondition user -sys_ksp_view

This works in the sense that I don't get the "WARNING! There are
options you set that were not used!" message, but still ksp_view
reports A11 instead of user provided matrix.

Can you send a small test code, since I use this everyday here and it works.

  Thanks,

     Matt

Chris

dr. ir. Christiaan Klaij
CFD Researcher
Research & Development
E mailto:C.Klaij at marin.nl<mailto:C.Klaij at marin.nl>
T +31 317 49 33 44<tel:%2B31%20317%2049%2033%2044>

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