[petsc-users] PCDiagonalScale

Klaij, Christiaan C.Klaij at marin.nl
Thu Feb 24 07:34:16 CST 2011

I tried GCR but at first sight the diagonal scaling doesn't seem to do anything.

From: five9a2 at gmail.com [five9a2 at gmail.com] on behalf of Jed Brown [jed at 59A2.org]

Sent: Thursday, February 24, 2011 12:30 PM

On Thu, Feb 24, 2011 at 12:14, Klaij, Christiaan
<C.Klaij at marin.nl> wrote:

I'm using FGMRES but apparently it doesn't support diagonal scaling.

GCR also tolerates a variable preconditioner and it does not have such a check. I don't know if that means it can use diagonal scaling or just that someone forgot to check, but you could try it.

dr. ir. Christiaan Klaij
CFD Researcher
Research & Development
E mailto:C.Klaij at marin.nl
T +31 317 49 33 44

2, Haagsteeg, P.O. Box 28, 6700 AA Wageningen, The Netherlands
T +31 317 49 39 11, F +31 317 49 32 45, I www.marin.nl

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