[petsc-users] Recommended DOF/processor for direct solver

[Jed Brown]

Alex Lindsay <adlinds3 at ncsu.edu> writes:

> I've read on your FAQ page that a good rule of thumb for parallelization 
> is 20k DOF/processor. Does this apply equally to direct solves as well 
> as iterative? May be a dumb question...

Depends on dimension and discretization, but no simple rule of thumb
works because direct solvers are not scalable (in terms of memory or
time).
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