[Users] PUGH Questions

[Andreas Schäfer]

Hi,

I'm currently playing around with Cactus' Wave Toy demo to see what
Cactus can do (and how fast). AFAICS Wave Toy is parallelized by the
PUGH thorn. I'm a bit unsure about some details, so it would be nice
if you could answer some of my questions:

* In a cluster with heterogeneous machines, can PUGH perform automatic
  static load balancing to give faster machines more grid points?

* Can PUGH perform dynamic load balancing?

* When I use numbers of nodes that are not powers of 2, the domain
  decomposition sometimes degrades. For instance for 31 nodes a cube
  would be decomposed into 31 thin slices, leading to a rather bad
  surface to volume ratio. Is there any way to avoid such situations?
  (using only powers of two as numbers of nodes is not an option ;-) )

* Are alternatives to PUGH available that perform better in regards to
  the questions above?

Thanks
-Andreas


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Andreas Schäfer
Cluster and Metacomputing Working Group
Friedrich-Schiller-Universität Jena, Germany
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