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
[cid:image49f99d.JPG@47b8dbea.4cb89460][cid:imagef623f4.JPG@ef0158cd.488b8eaa]
dr. ir. Christiaan Klaij
CFD Researcher
Research & Development
MARIN
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11
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________________________________
From: Matthew Knepley <knep...@gmail.com>
Sent: Friday, August 29, 2014 4:14 PM
To: Klaij, Christiaan
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] PCFieldSplitSetSchurPre in fortran
On Fri, Aug 29, 2014 at 8:55 AM, Klaij, Christiaan
<c.kl...@marin.nl<mailto:c.kl...@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.kl...@marin.nl<mailto:c.kl...@marin.nl>
T +31 317 49 33 44<tel:%2B31%20317%2049%2033%2044>
MARIN
2, Haagsteeg, P.O. Box 28, 6700 AA Wageningen, The Netherlands
T +31 317 49 39 11<tel:%2B31%20317%2049%2039%2011>, F +31 317 49 32
45<tel:%2B31%20317%2049%2032%2045>, I www.marin.nl<http://www.marin.nl>
--
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
