[petsc-dev] print statements in fortran interface functions

[Mark Adams]

On Mon, Mar 16, 2020 at 9:50 PM Jacob Faibussowitsch <jacob.fai at gmail.com>
wrote:

> Hello Mark,
>
> If you are using PetscInfo to print, PetscInfo requires that you pass
> “-info” as a command line flag in order to print anything. Sounds simple
> enough to miss, did you run your code with it? i.e. ./yourCode -info?
>

Yea, I added -info.


>
> For what its worth, PetscPrintf on PETSC_COMM_WORLD will always print but
> only from proc 0. PetscSynchronizedPrintf prints from all in order. Might
> be more useful for debugging than PetscInfo!
>

Yea, I started with PetscPrintf. Started with WORLD then tried SELF. Still
no output but I can step through the code and see the print statements, but
nothing.

This is on Cori/Haswell. I have now used printf on my Mac and it works. I
did not do an install on my Mac, but I would not think that would matter...
I should test that I suppose.


>
> Best regards,
>
> Jacob Faibussowitsch
> (Jacob Fai - booss - oh - vitch)
> Cell: (312) 694-3391
>
> On Mar 16, 2020, at 7:54 PM, Mark Adams <mfadams at lbl.gov> wrote:
>
> I am trying to debug an application code that works with v3.7 but fails
> with master. The code works for "normal" solvers but for a solver that uses
> FieldSplit it fails. It looks like vectors are not getting created from
> MatCreateVecs with a matrix that is a MatNest (I can't run the code).
>
> I have put print statements in the interface files to try to see what is
> going on but the print statements seem to disappear somehow. (I added the
> same print statements in my installation of v3.7 to see what is different)
> I was using PetscPrint and then found and example of a Fortran PetscInfo
> and switched to that. I stepped through the code with DDT and see the print
> statements but nothing goes to the output. I did this DDT stuff with
> ex73f90t, which has a MatCreateNest.
>
> I am completely baffled. Does anyone have any ideas?
>
> Thanks,
> Mark
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20200316/27deed64/attachment.html>