[Paraview] Parallel MB reader

Tue Jun 28 13:08:25 EDT 2011

Paul,

That's exactly what I was after and what Andy suggested. My serial reader
had an implicit assumption of the multiblock data structure to keep it
flexible. However, in parallel it meant that the data structure was never
the same on each process, as each mesh partition only knows about a small
number of the total blocks available in the serial mesh.

Thanks for the info!

Regards,

Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk 

  _____  

From: Paul Edwards [mailto:paul.m.edwards at gmail.com] 
Sent: 28 June 2011 17:25
To: agagliardi at ara.co.uk
Cc: ParaView list
Subject: Re: [Paraview] Parallel MB reader

Adriano, 

I'm not totally sure I understand your question but this thread might be of
use where I was asking about multi block data sets in parallel:

      http://markmail.org/message/skb653xqwa4hvs4c

Regards,
Paul

On 28 June 2011 16:24, Andy Bauer <andy.bauer at kitware.com> wrote:

If I understand you correctly I think you need to do 2.  Each process should
have the same multiblock structure and will just not contain a data set for
the leaves that are assigned to a different process.  Check out
http://www.vtk.org/doc/nightly/html/classvtkMultiBlockDataSet.html#details

HTH,
Andy 

On Tue, Jun 28, 2011 at 5:38 AM, Adriano Gagliardi <agagliardi at ara.co.uk>
wrote:

I've run into an issue when writing a parallel reader for partitioned files
containing multi-block data. All data reads in fine on each process and
works as expected, except for one thing. Since each partition only knows
about the blocks it contains (and not the global blocks), I've not been able
to have all the blocks available in the entire data-set available to the
user. What I get instead is the list of blocks read in by the last data
reader. I've got a couple of ideas to resolve this issue.

(1) Have some sort of communication between each of the PV processes to
ascertain which process has which data

(2) Have the number of blocks stored on each process the same as the global
number of blocks, but just allocate data to the blocks that each
partition/process has data of.

So, my questions are:

(1) Is item (1) possible and, if so, what class(es) should I be looking at
to do it

(2) Will item (2) alone solve my issue, or will I run into problems whereby
if block 0 has 50% of its data on partition 0 and the rest on partition 1
that, after reading in, I will only ever see 50% of block 0 being whichever
of partition 0 or 1 is read in last.

Thanks again,

Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk

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