fenics team mailing list archive

["Matthew Knepley" <knepley@xxxxxxxxx>]

On Tue, Mar 18, 2008 at 10:46 AM, Anders Logg <logg@xxxxxxxxx> wrote:
> On Tue, Mar 18, 2008 at 10:37:38AM -0500, Matthew Knepley wrote:
>  > On Tue, Mar 18, 2008 at 10:34 AM, Anders Logg <logg@xxxxxxxxx> wrote:
>  > > On Sun, Mar 16, 2008 at 04:50:07PM +0100, Martin Sandve Alnæs wrote:
>  > >  > I highly recommend that all Python projects in FEniCS use the module
>  > >  > "logging" that comes with Python from version 2.3. It is very simple
>  > >  > and very flexible, in particular for creating cross-module logs. For
>  > >  > the most basic usage, look at output.py and the tests in UFL.
>  > >  >
>  > >  > Basic tutorial (good site for handy python modules):
>  > >  > http://blog.doughellmann.com/2007/05/pymotw-logging.html
>  > >  >
>  > >  > Reference:
>  > >  > http://docs.python.org/lib/module-logging.html
>  > >
>  > >  Sounds good, but the big problem is more likely to coordinate logging
>  > >  from C++ (DOLFIN) and Python. Is there a nice solution for this?
>  >
>  > As long as whole lines are always written, and the file is line buffered, I
>  > think writing from two different file descriptors should be fine. The nice
>  > thing would be to replicate the format in C++.
>  >
>  >    Matt
>
>  Even if the file is stdout?

stdout is usually character buffered. You have to change the flag on
your descriptor I believe.

  Matt

>  The format looks surprisingly similar to what we have implemented:
>
>   logging.debug    --> dolfin::dolfin_debug
>   logging.info     --> dolfin::message
>   logging.warning  --> dolfin::warning
>   logging.error    --> dolfin::error
>
>  (Maybe not so surprising since these are fairly obvious names.)
>
>  Anyway, it would be easy for us to move to something else (or modify
>  the behavior so it's identical to the logging module).
>
>  --
>
>
> Anders
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