Time to execute KSPSetUp

Matthew Knepley knepley at gmail.com
Thu Jan 29 20:36:34 CST 2009

On Thu, Jan 29, 2009 at 7:46 PM, jerome ho <jerome.snho at gmail.com> wrote:
> Hi
> I wonder if there's any way I can speed up KSPSetUp()?
> On larger test cases with 1e8 unknowns, it's taking more than 17 hours (and
> still incomplete) to execute this command across 3 processors with
> BoomerAMG,
> where as the whole setup+solving takes 2 min if the problem size is 1e6.
> I've verified that the matrices has completed assembly and I'm using the
> non-debugging Petsc version.

We have no control over the code in Hypre. I suggest mailing the Hypre
developers. The setup phase is the most costly part.


> Jerome
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
-- Norbert Wiener

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