petsc-users

[Matthew Knepley]

Actually, I believe that this is the wrong question. One of the
motivations behind
PETSc is the lack of any theory indicating which solver/pc performs best with
which equation/discretization. The only options is to try them all. We make this
easy. You can set -ksp_type and -pc_type from the command line. If the
combination
will not work, you jsut get an error and keep going. We usually use a
shell script for
this.

  Thanks,

    Matt

On 11/20/06, sqbang <sqbang at 163.com> wrote:
> Dear sir:
>     I would be most grateful if you could give me some suggestions on Petsc.
> I'm a new user. One question I met is which method should be used when
> solving FEM(finite element method)questions ? In detail,KSP gives several
> methods and a lot of precondition, how to combinate them to work
> effectively?  Does there exist the cases that some specific combinations are
> forbidden?
>      I would like to thank you for your generous help. Your prompt attention
> to this letter would be highly appreciated.
>      I am looking forward to hearing from you.
>                                  sd.
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-- 
"Failure has a thousand explanations. Success doesn't need one" -- Sir
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