how big can I go

[Yann Tambouret]

Hi,

I'm new to PETSc and I'm try to solve a linear system that has nine 
terms per equation, along the diagonal. I'd like to use a  bluegene 
machine to solve for a large number of unknowns (10's of millions). Does 
anyone have advice for such problem? Which algorithms scale best on such 
a machine?

I can of course provide more detail, so please don't hesitate to ask.

Thanks,

Yann