[petsc-users] AMG as preconditioner

[M.Younas]

 Hi, PETSc, Team,

I have 
solved a non-symmetric Poisson problem using GMRES(m) as solver and 
BoomerAMG (from Hypre) as preconditioner. But I don't understand how the
 BoomerAMG works as preconditioner with GMRES(m). Can anyone explain the
 procedure? Does it work like BoomerAMG precondition the liner system 
first (once only) and then GMRES(m) is being used for stopping 
criterion?

Kind regards,

Younas

RUG, Groningen, The Netherlands.
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