[petsc-users] -ksp_diagonal_scale

Jed Brown jedbrown at mcs.anl.gov
Fri Dec 23 13:24:50 CST 2011

On Fri, Dec 23, 2011 at 04:11, Alexander Grayver <agrayver at gfz-potsdam.de>wrote:

> I would also be interested more to know how it scales system? I mean what
> is idea behind this scaling.


It takes the inverse square root of the diagonal and does symmetric
scaling. If you used this with no additional preconditioner, it would be
like preconditioning with Jacobi. The point is to correct some ill-scaling
*before* sending the matrix to an algebraic preconditioner.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111223/b1ade694/attachment.htm>

More information about the petsc-users mailing list