itaps-parallel Proposal for handling queries with parts, sets, and partitions

[Tim Tautges]

Then why do we need functions operating on parts or partitions at all? 
Those are reverse classification-type queries, right?

- tim

Mark Shephard wrote:
> 
> 
> Since the first thing that was agreed to is that there would be the 
> ability to deal parts that does not require an implementation to do 
> things via sets (reverse classification), I sure hope we are not getting 
> this issue confused again. As discussed in some technical detail at the 
> boot camp, there are two high level approaches one based on 
> classification (no use of sets) and reverse classification (what sets do 
> well). All the SCOREC tools that are being used for parallel adaptive 
> simulations, and (in the past) for parallel mesh generation, are based 
> on a classification approach.
> 
> Onkar Sahni wrote:
>>> So again, I go back to asking: what are the core needs that prevent us
>>> from using sets as both parts and partitions?  The entity set mechanism
>>> was designed with this specific usage in mind.
>>
>> If "sets as both parts and partitions" mean using entity-sets then we 
>> have
>> already discussed this in great detail. I think the question in 
>> discussion
>> is irrespective of how one implements parts and partitions? If I
>> understood the question right then we need to answer queries which 
>> involve
>> a specific part and a specific entity-set (where entity-set may span more
>> than one part, may be local to a process). Now, if it is implied that
>> choosing entity-sets for both parts and partitions allows to use set
>> operations (booleans), outside the interface explicitly by applications,
>> to answer such queries well then applications might as well do it in 
>> other
>> equivalent ways (for example, loop over entities in set and ask residence
>> parts to get entities in the entity-sey belonging to a specific part).
>>
>> - Onkar
>>
> 
> 

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              Tim Tautges            Argonne National Laboratory
          (tautges at mcs.anl.gov)      (telecommuting from UW-Madison)
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