itaps-parallel Questions about iMeshP

[Devine, Karen D]

Thanks, Tim, for providing a good example.  Here's another:  a
particle-in-cell code can partition the mesh one way for force calculations
and a different way for particle calculations.  The force calculations use a
static partitioning; the particle calculations use a dynamic partitioning
that attempts to maintain particle balance.

Karen





On 12/18/09 9:54 AM, "Tim Tautges" <tautges at mcs.anl.gov> wrote:

> The best example, brought up by both Karen and me IIRC, is of
> large-deformation transient dynamics with contact, where
> the FE solution of the dynamics is solved on 3d elements on one partition, and
> the contact solution is solved on faces
> on a different partition.  Many believe it was this capability that made truly
> scalable parallel FEM with contact even
> possible.  See e.g.
> 
> Transient dynamics simulations: parallel algorithms for contact detection and
> smoothed particle hydrodynamics,
> Proceedings of the 1996 ACM/IEEE conference on Supercomputing, 1996.
> 
> That's just one reference, there are many others for that particular work.
> 
> I think the details of multiple *active* partitions still need some work, both
> in use cases and in how they behave under
> iMeshP.  Normally I wouldn't advocate such an unexplored thing being part of
> the initial interface definition, but in
> this case I think it's an important enough capability that it's justified.
> 
> - tim
> 
> Mark Beall wrote:
>> As a more general context to the questions that Saurabh asked, the main
>> questions we have about iMeshP are issues related to having multiple
>> partitions. Although we won't be supporting that for now (since our
>> software doesn't support that), it would be helpful in understanding
>> that need if someone could give some examples of how this functionality
>> would be used.
>> 
>> mark
>> 
>> 
> 
> --
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> 
>               Tim Tautges            Argonne National Laboratory
>           (tautges at mcs.anl.gov)      (telecommuting from UW-Madison)
>           phone: (608) 263-8485      1500 Engineering Dr.
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>