itaps-parallel iMeshP_syncPartitionAll, iMeshP_getNumGlobalParts, and communication

[Jason Kraftcheck]

Onkar Sahni wrote:
> See my comments below:
> 
>> 1) Do global communication for all partitions during file load to cache
>>     global number of parts for each partition read from file.
>>
> 
>    iMesh_load allows only one partition (i.e., iMeshP_PartitionHandle) as
> an input. So I do not know what load of 'all partitions' means... (may
> be I am missing something). And as per my understanding either
> iMesh_load is collective or is followed by call to
> iMeshP_syncPartitionAll
> 

iMesh_load allows one partition to use to distribute the mesh amongst
processors (one active partition).  That does not mean that there cannot be
others (e.g. doing partitioning in parallel).


>> 2) Require application to associate an an MPI_Comm with any partition (we
>>     don't have an API for this) and call iMeshP_syncPartitionAll on it
>>     before expecting to be able to get any global data.
>>
> 
>   iMeshP_createPartitionAll takes MPI_Comm as an input and as per my
> understanding thats how application will associate an MPI_Comm with any
> partition.
> 

But that only works if the application creates the partition.

- jason