[petsc-dev] synchronized printing, singletons, and jumbled GAMG/BJacobi output

[Barry Smith]

On May 25, 2013, at 7:22 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Barry Smith <bsmith at mcs.anl.gov> writes:
> 
>>   It would be confusing if it only prints rank 0 when the others are
>>   also interesting. I suggest it gather statistics from all the
>>   processes and print a summary.
> 
> How should it summarize?  (There are so many things that could be
> different.)  Would it be okay to say "Subdomain solver on other
> processes, use -mg_coarse_pc_bjacobi_view_all_subdomains for details"?
> 
> What should we do with 3.4?  -ksp_view is currently unusable when run
> with -pc_type gamg, especially on more than a handful of processes.

  Why is gamg using bjacobi as the course solver? And why does it have different solvers on each process? Seems more a problem with GAMG then with viewing.

   Barry