[petsc-users] Solving Poisson equation with multigrid

[Jed Brown]

Michele Rosso <mrosso at uci.edu> writes:

> Hi,
>
> I confirm that
>
>          -pc_type gamg  -pc_mg_cycle_type v  -pc_gamg_agg_nsmooths 1
>
> produces the correct shift in PETSc 3.4.
> So my problem is solved.   I will upgrade to 3.4 in my productive 
> machine installation.
> It is a Cray machine (Blue Waters). Assuming I want to use the Cray 
> compiler, which options should I use for ./configure
> for the installation.

Or the Intel compiler or GCC.  PETSc should run at similar speed with
any.  IIRC, Cray recommends the Intel compiler on their machines with
Intel CPUs.  There are examples in config/examples/.