[petsc-users] Boomeramg as a solver

Hello, I've used Boomeramg as a preconditioner. Now, I am wondering whether I can use Boomeramg as a solver ? and is it possible that I use Boomeramg as both a preconditioner and a solver? I saw one slide saying that I can use KSPSetType(ksp, KSPRICHARDSON); But when I try it and use -ksp_view, it shows that my solver is Richardson not Boomeramg. Could u clarify this issue ? Thank you. - Jibum