[petsc-users] Convergence is different with different processors

[Jed Brown]

On Sat, Feb 16, 2013 at 12:21 PM, w_ang_temp <w_ang_temp at 163.com> wrote:

>   Is it true that BJacobi preconditioner is only one type of ASM
> preconditioner(overlap=0), it is only one part of ASM?
>     I find that sometimes the two have the same results while sometimes
> they are not. Is the reason that PETSc can
> internally get the better parameter when using ASM, and sometimes it use
> overlap=0 then ASM and BJacobi have the same
> results.
>     If it is true, ASM is always better than BJacobi?
>

BJacobi is slightly more efficient to implement, but -pc_type asm
-pc_asm_overlap 0 is block Jacobi.
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