[Getdp] Questions on solver parameters

[hypsin at gmail.com]

Hello,

I am just learning to use GetDP as I have adopted some code, and would very
much appreciate a few pointers on the solver options!

According to the manual, GetDP uses linear solvers from PETSc by default,
and I can change solver options/parameters in the command lines or .petscrc
file. I have a few questions about this:

1) I ran a simple electrostatic model and it showed, "preonly lu mumps"
during processing, I think, that meant the direct LU solver from MUMPS was
used? Is this the default solver option within PETSc?

2) How I can find the default tolerance settings? Oddly I can't seem to
find a .petscrc file within my directories...   I am using the precompiled
GetDP 3.0 version download from the website.

Thank you for your help!

Regards,
Shin
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