[Pcamal-dev] Combining file

[Philippe P. Pebay]

OpenMP: that is an interesting point of view. In my knowledge, shared 
memory architectures are famous for their inability to scale, especially 
within reasonable costs.

Regarding file recombination: if some applications can readily deal with 
distributed files, this is good. But I would agree with Darryl's 
opinion, regarding the fact that it is good to have at least the ability 
(for the sake of genericity) to recombine all files into a single one.

If the number of generated nodes is known, then we're good: it suffices 
to add the cumulative per-block offsets to the local node IDs. BTW, this 
is *not* what we are doing with the StreamingTessellator (because the 
number of generated nodes is not known upfront).

P.

Owen, Steven James wrote:
> I had an interesting discussion with Kevin Copps yesterday regarding our
> parallel hex project.
> 
> He mentioned that he thinks OpenMP will be the preferred method for
> parallel computing using Dual/multi-core technology.  Not sure if this
> is something we should even be concerned about right now, but he seemed
> to be pretty convinced that distributed computing was not the best way
> to do things.
> 
> I asked about recombining files.  He indicated that it would be fine to
> leave them separate.  Sierra could handle the multiple files, although
> it was not the typical use case.  Perhaps we provide the option to
> recombine or not?  He mentioned a SEACAS tool for doing the
> recombination.  Perhaps we just use that rather than reinventing our
> own? 
> 
> I still think it would be good to get Greg's opinion on the recombining
> of files however.
> 
> Another point he brought up - we may have already considered.  Are we
> ensuring that the node numbers will be unique across the multiple files.
> Seems like it would be pretty easy to do since we know up front the
> number of nodes we will generate (ie. N sweep-layers times M nodes per
> layer) 
> 
> -steve   
> 
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Philippe P. Pebay                |      pppebay at ca.sandia.gov
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