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

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> Okay, I thought as the docs stand today, this is misleading. If we declare
> that Singletons are
> for synchronized printing, then that is fine.

If you don't synchronize the printing, it always produces jumbled
output.  I would document that it is indeed synchronizing, but pretty
much all use cases are wrong, and are making noise in the test suite.
For example:

$ cd src/vec/vec/examples/tests
$ make ex24
$ make runex24
31d30
< ----
41d39
< ----
48a47,48
> ----
> ----
/home/jed/petsc/src/vec/vec/examples/tests
Possible problem with with ex24_1, diffs above \n=========================================
$ make runex24
27c27
< 3
---
> Vector Object:Vector Object:3
28a29,31
>  1 MPI processes
>  1 MPI processes
>   type: seq
30,32d32
< 6
< ----
< Vector Object: 1 MPI processes
33a34
> 6
35a37
> 10
41,44d42
< ----
< Vector Object: 1 MPI processes
<   type: seq
< 10
48a47,48
> ----
> ----
/home/jed/petsc/src/vec/vec/examples/tests
Possible problem with with ex24_1, diffs above \n=========================================