[Paraview] Parallel Data Redistribution

[Biddiscombe, John A.]

I have a filter pipeline which reads N blocks from disk, this works fine on N processors. 

I now wish to subdivide those N blocks (using a custom filter) to produce new data which will consist of M blocks - where M >> N.

I wish to run the algorithm on M processors and have the piece information transformed between the two filters (reader -> splitter), so that blocks are distributed correctly. The reader will Read N blocks (leaving M-N processes unoccupied), but the filter which splits them up needs to output a different number of pieces and have the full M processes receiving data.

I have a reasonably good idea of how to implement this, but I'm wondering if any filters already do something similar. I will of course take apart the D3 filter for ideas, but I don't need to do a parallel spatial decomposition since my blocks are already discrete - I just want to redistribute the blocks around and more importantly change the numbers of them between filters.

If anyone can suggest examples which do this already, please do

Thanks

JB

-- 
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82