PETSc lib performance tuning

[abdul-rahman at tu-harburg.de]

Hi all,

I have a couple questions about the PETSc performance:

Does having ATLAS ( math-atlas.sourceforge.net ) help ? If so how do I
hook it to PETSc ?

How do I best customize the compiler flags? Should I edit the
variables directly in petscconf, or can I do it with configure ?


Thanks,

Razi