Hello Experts,
When using a KSP Shell PreConditioner, is the LEFT, RIGHT, SYMMETRIC option
applicable?
call KSPGetPC(ksp,pc,ierr)
call PCSetType(pc,PCSHELL,ierr)
call KSPSetPreconditionerSide(ksp,PC_SYMMETRIC,ierr)
call PCShellSetApply(pc,JacobiShellPCApply,ierr)
The JacobiShellPCApply PreConditioner improves convergence considerably on my
KSPCG problem. However, I have found empirically that using PC_LEFT, PC_RIGHT,
PC_SYMMETRIC seems to have no effect on the convergence of the solution. Can
anyone explain this unusual situation?
Thanks in advance for any help.
Cheers,
Rob
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