[Users] using PETSc with the appropriate benchmark

[Avi Purkayastha]

Erik,
thanks for the update..

>
> We have at the moment no benchmark for elliptic equations, but we  
> have examples solving elliptic equations e.g. in the thorn  
> CactusWave/IDScalarWaveElliptic.  This example solves an elliptic  
> equation for the initial condition, and then continues with a few  
> time steps of explicit time stepping without solving an elliptic  
> equation.  This example could be standardised into a benchmark,  
> which would mostly entail choosing interesting and reasonable  
> problem sizes.
>

This would be of some interest to me, although solving an elliptic  
equation just for the initial condition would probably not be  
sufficient to benchmark petsc performance and/or the wave elliptic  
thorn.

> The problem size is chosen by the parameter global_nsize e.g. in  
> CactusWave/IDScalarWaveElliptic/par/source_petsc.par.

btw, I noticed that was no CactusWave thorn in the Cactus source that  
I have. How does one get  it separately?

	-- Avi

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