[petsc-users] Weighted Jacobi, and scaling 2nd matrix in KSPSetOperators

[Timothée Nicolas]

Hi all,

It sounds it should be obvious but I can't find it somehow. I would like to
use weighted jacobi (more precisely point block jacobi) as a smoother for
multigrid, but I don't find the options to set a weight omega, after I set
-mg_levels_pc_type pbjacobi  So I was thinking I could just artificially
scale the second matrix in KSPSetOperators with a weight omega. Since it is
the one used in retrieving the diagonal, it should be equivalent to have a
weight and should not affect the residuals, right ? However, I notice no
change of behaviour whatsoever when I do this.

Is it normal ? Have I grossly misunderstood something ?

Thanks

Timothee
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