[petsc-users] default preconditioning side for KSPFGMRES in 3.2

[Barry Smith]

   FGMRES never supported left preconditioning, it always used right

   It may have previously silently switched to right when needed.

   Barry

   It may be that the FGMRES algorithm only makes sense with right preconditioning

On Oct 25, 2011, at 3:46 PM, Dominik Szczerba wrote:

> Has the default preconditioning side for KSPFGMRES changed between 3.1 and 3.2?
> I am debugging one of my old 3.1 codes where I had two KSPFGMRES
> solvers with explicit defined PC side, and after upgrade to 3.2 one
> and only one of them complains he does not support left
> preconditioning.
> 
> Many thanks for any directions.
> 
> Dominik