On Wed, 3 Feb 2016, John Peterson wrote:

> On Wed, Feb 3, 2016 at 4:31 PM, Junchao Zhang <junchao.zh...@gmail.com>
> wrote:
>
>> I find libmesh does not accept some PETsc KSP options, such as -ksp_rtol
>> 0.  It is likely that libmesh calls KSPSetFromOptions() too early, before
>> other customization routines.
>
> I'd be very surprised if that's the case.  We've been setting PETSc command
> line options from the command line in libmesh for a very long time...

Hmm.. but different options have different APIs, and the order in
which they're called matters.  It looks like we KSPSetFromOptions at
init time, but then we call KSPSetTolerances at solve time, so the
latter would override the former.
---
Roy

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