[petsc-users] The parallel preconditioner

[paul zhang]

Matt,

That really makes sense to me.

Thanks,
Paul

Huaibao (Paul) Zhang
*Gas Surface Interactions Lab*
Department of Mechanical Engineering
University of Kentucky,
Lexington,
KY, 40506-0503
*Office*: 216 Ralph G. Anderson Building
*Web*:gsil.engineering.uky.edu

On Fri, Apr 17, 2015 at 9:31 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Fri, Apr 17, 2015 at 8:28 AM, paul zhang <paulhuaizhang at gmail.com>
> wrote:
>
>> I agree with you. The performance indeed depends on the type of problem.
>> Anyway, back to the questions I proposed, I am afraid ILU and LU are
>> not sequential only. Am I right?
>>
>
> As it says in the table, the PETSc implementations are sequential, but
> there are parallel implementations available through
> other packages, such as SuperLU_dist, which can de downloaded through
> configure, e.g. --download-superlu_dist.
>
>   Thanks,
>
>     Matt
>
>
>> Thanks,
>> Paul
>>
>> Huaibao (Paul) Zhang
>> *Gas Surface Interactions Lab*
>> Department of Mechanical Engineering
>> University of Kentucky,
>> Lexington,
>> KY, 40506-0503
>> *Office*: 216 Ralph G. Anderson Building
>> *Web*:gsil.engineering.uky.edu
>>
>> On Fri, Apr 17, 2015 at 3:22 AM, Patrick Sanan <patrick.sanan at gmail.com>
>> wrote:
>>
>>> You can find the current list of preconditioners on line 40 here:
>>>
>>> http://www.mcs.anl.gov/petsc/petsc-current/include/petscpc.h.html
>>>
>>> You can click on the names to be taken to man pages.
>>>
>>> However, since preconditioners are by nature problem-dependent, it's a
>>> better idea to try to look up what might be an appropriate preconditioner
>>> for your system and then see how to use PETSc to apply it. There's a high
>>> probability that what you need is supported either natively by PETSc or as
>>> Jed's note demonstrates, through interfaces to external libraries (of which
>>> there are a large number - run ./configure -help to get an idea of the
>>> options available and the configure flags to use them)
>>>
>>>
>>> Il giorno 16/apr/2015, alle ore 23:54, huaibao zhang <
>>> huaibao.zhang at gmail.com> ha scritto:
>>>
>>> Hello there,
>>>
>>> I have been confused of the extent of the available preconditioners in
>>> PETSc for a while. Here are the lists I got from one slide of a lecture
>>> notes saying
>>>
>>> Block Jacobi,
>>> Jacobi,
>>> Overlapping Additive Schwarz,
>>> ICC, ILU (sequential only)
>>> ILU(K), LU(direct solver, sequential only)
>>> sor
>>> etc.
>>>
>>>
>>> But in some other sources, only LU is highlighted with "sequential
>>> only". Which one is correct? I am using MATCreateAIJ to construct my A.
>>> Which preconditioner is available to me? By the way, I  tested asm, ilu,
>>> icc, and they all failed.
>>>
>>> Thanks,
>>> Paul
>>>
>>>
>>
>
>
> --
> 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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20150417/e388689a/attachment-0001.html>