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?
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! Best regards, Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch) Cell: (312) 694-3391 > On Mar 16, 2020, at 7:54 PM, Mark Adams <[email protected]> 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
