[petsc-users] KSPSetDiagonalScale

[Jed Brown]

On Thu, May 17, 2012 at 2:50 PM, Colin McAuliffe <cjm2176 at columbia.edu>wrote:

> Using the direct solver as a preconditioner I can't seem to find any
> difference between the results with -ksp_diagonal_scale vs the results
> without this option.


I wouldn't expect it to be any different.

 I also cant tell if the diagonal scaling is actually being applied in this
> case.


Run with -ksp_view and look for a line that says "diagonally scaled system".
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