[petsc-users] Advices to decrease bicgstab iterations

[Jed Brown]

When asking solvers advice, please always explain the problem you are
solving and the discretization that you use.

Edoardo alinovi <edoardo.alinovi at gmail.com> writes:

> Dear petsc users,
>
> I am doing some calculations to test my code in parallel using petsc. With
> respect the serial code, which uses an in house bicstab+diagonal ILU
> preconditioner, I note that petsc's bicgstab+ASM with standard options need
> a larger number of iterations to converge (order 3 to 5). In base on your
> expirience, do you have any method to improve the preconditioning?
>
> Thak you  ery much,
>
> Edoardo