itaps-parallel A question about iMeshP interface functions

[Jason Kraftcheck]

txie at scorec.rpi.edu wrote:
> Dear all,
> 
> I have a question about the design of some iMeshP Entity interface
> functions. This question is relative to the real execution performance.
> 
> Some iMeshP Entity interface functions provide two input arguments:
> entity_handle and partition_handle. The specification requires that one
> function returns an error code if an entity is not in the partition. But
> the question is how to decide whether an entity is in the partition since
> entity_handle (iBase_EntityHandle) may be not globally unique in the
> partition.
> 
> I can think of one way in FMDB implementation:
>  * Get all the local_part_handles in the partition,
>  * Then get the mesh within each local part,
>  * Iterate all mesh entities of all dimensions in each part mesh,
>  * Check if the given entity_handle equals any mesh entity. If yes,
> entity_handle is valid and local. Otherwise, it is not valid.
> 
> But this way is not time efficient in the real performance.
> 
> Please let me know if I make any mistakes or you have any problems about
> this question. Thanks.
> 

Which functions in particular do you find problematic?  The one with the
specified error behavior that you describe above is: iMeshP_getEntOwnerPart.
 If the above sequence of steps is required for you to determine whether or
not an entity is in a partition, wouldn't you have to do that search anyway
to find the part handle?

- jason