KSP/PC choice

[gaatenek at irisa.fr]

Dear Tims,
The problem is how to solve more accuretly the local problem in ASM. You
can also use KSP to solve local problem.
I think you can look how to do it with PCASMGetSubKSP().
Best Regards,
Guy

> Dear gaatenek
>
> On Mon, 23 Jul 2007, gaatenek at irisa.fr wrote:
>
>> Do you monitoring the convergence? Try it a see if you have stagnation
>> in
>> your convergence.
>
> Yes, I monitor it, but that doesn't seem to give me any helpful
> information -- except that it stagnates of course.
>
>> However you can  try this setting,
>> -ksp_type gmres
>> -ksp_gmres_restart 30
>> -pc_type asm
>> -pc_asm_overlap 2
>> -sub_pc_type ilu
>> -sub_pc_factor_zeropivot 0
>> -sub_pc_ilu_levels 3
>
> Thank you, I tried it, and it worked well for a test case.  However,
> for the real application, the PC eats up all my memory (even in cases
> where my former setting did work).
>
> Any hints (except buying a larger computer)?
>
> Might some sub_ksp method help?
>
> Best Regards,
>
> Tim
>
> --
> Dr. Tim Kroeger                            Phone +49-421-218-7710
> tim at mevis.de, tim at cevis.uni-bremen.de      Fax   +49-421-218-4236
>
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