[petsc-users] Metis partitioning question

[Mohammad Mirzadeh]

if you want to use a general unstructured grid, you may want to have a look
at $PETSC_DIR/src/dm/ao/examples/tutorials/ex2.c

Mohammad

On Thu, Aug 4, 2011 at 4:43 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Aug 4, 2011 at 11:31 PM, Tabrez Ali <stali at geology.wisc.edu>wrote:
>
>> Hello
>>
>> If a mesh is partitioned using Metis but the original order of nodes is
>> used to create/partition the matrix then would this be significantly bad for
>> performance and scalability.
>>
>
> That depends. Many mesh generators h ave fairly good ordering on output,
> but some do not. Definitely a bad order can make a huge
> difference in performance, both for cache traffic and conditioning reasons.
>
>
>> Also is there an example that uses Metis to partition an unstructured
>> mesh?
>>
>
> This depends on what you mean. If you can encode your mesh as a Mat, you
> can use MatPartitoning. If not,
> you would need to use DMMesh things, such as SNES ex12.
>
>     Matt
>
>
>> Thanks in advance.
>>
>> Tabrez
>
> --
> 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
>
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