[petsc-users] Using GAMG to speed up solving of Poisson eqn

[Jed Brown]

TAY wee-beng <zonexo at gmail.com> writes:
> /**/call KSPSolve(ksp,b_rhs,xx,ierr)/**/- hang
> /**/
> /**/call KSPGetConvergedReason(ksp,reason,ierr)/*

If there was any question, this commenting style is insane.

> It hangs at */KSPSolve/*, when used with the option :
>
> -poisson_pc_gamg_agg_nsmooths 1 -poisson_pc_type gamg

Run in a debugger so you can find where it "hangs".  Add -ksp_monitor
-pc_gamg_verbose so you can get more information about what setup steps
complete successfully.
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