[petsc-users] Petsc ILU PC Change between 3.6.4 and 3.7.x?

[Barry Smith]

  In complicated scenarios with deep nesting of solvers it is sometimes not possible to set the options for the deeply nested solvers directly from the code with function calls. Thus we recommend using the options database for such cases. Note that one can provide options on the command line, in a file, with calls to PetscOptionsSetValue(), PetscOptionsInsertString(), PetscOptionsInsertFile()



> On Aug 22, 2017, at 11:51 PM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:
> 
> Lawrence,
> 
> Well, I was looking for something like SubPCFactorSetShiftType,
> or is it supposed to somehow "trickle down" to the sub pc's?
> 
> Or should I setup the pc, get the sub-pc's and then apply
> PCFactorSetShiftType on the sub pc's, something like
> 
> CALL KSPSetup(ksp)
> CALL PCBJacobiGetSubKSP(ksp, subksp)
> CALL KSPGetPC(subksp, subpc, ierr)
> CALL PCFactorSetShiftType(subpc,MAT_SHIFT_NONZERO,ierr)
> 
> Chris
> 
>> Message: 2
>> Date: Tue, 22 Aug 2017 15:17:58 +0100
>> From: Lawrence Mitchell <lawrence.mitchell at imperial.ac.uk>
>> To: petsc-users at mcs.anl.gov
>> Subject: Re: [petsc-users] Petsc ILU PC Change between 3.6.4 and
>>        3.7.x?
>> Message-ID: <14d4c158-95b1-96ab-90b7-b81d3239b0dc at imperial.ac.uk>
>> Content-Type: text/plain; charset=utf-8
>> 
>> 
>> 
>> On 22/08/17 14:49, Klaij, Christiaan wrote:
>>> CALL PetscOptionsSetValue(PETSC_NULL_OBJECT,"-sub_pc_factor_shift_type","nonzero",ierr)
>>> 
>>> since there seems to be no setter function for this (correct me
>>> if I'm wrong).
>> 
>> I think you want PCFactorSetShiftType.
>> 
>> Lawrence
> 
> 
> dr. ir. Christiaan Klaij  | Senior Researcher | Research & Development
> MARIN | T +31 317 49 33 44 | mailto:C.Klaij at marin.nl | http://www.marin.nl
> 
> MARIN news: http://www.marin.nl/web/News/News-items/AMT17-October-1113-Glasgow.htm
>