[petsc-users] how to simultaneously perform the partition of the unstructured mesh and reduction bandwidth of the resulting sparsematrix

[Jed Brown]

丁老师 <ztdepyahoo at 163.com> writes:

> i think bandwidth minimization will improve the convergence of the kspsolver, am i right?

Bandwidth is *irrelevant* for Krylov methods.  It can affect
preconditioning, but it's really not the right metric.  Choose a
partitioning that respects the coupling strength in your problem, then
choose a local ordering that has the properties you like.  (Low
bandwidth is just one possibility.)
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