On Aug 5, 5:07 pm, Robert Bradshaw <rober...@math.washington.edu>
wrote:
> On Fri, Aug 5, 2011 at 1:10 PM, kcrisman <kcris...@gmail.com> wrote:
> > Recently, Leif and I have been trying to track down #11551 (Pari
> > segfaults on startup in Cygwin).
>
> > The problem occurs in a (to me) odd spot. Namely, in sage/misc/
> > functional.py, there is an import of CDF. Print statements show that
> > - all inside this one line! - we initialize PariInstance, go to
> > integer.pyx for the first time, and lots of other stuff.
>
> > The problem is that all of these things happen BEFORE ANY print
> > statements in complex_number.pyx! Looking at complex_number.c, it
> > becomes clear that this is because Cython puts a lot of cimport and
> > other stuff long before the "regular" stuff in the C file.
>
> Yeah, it's a mess. By the time misc.all is done, most of the Sage
> library has been loaded, and in a completely chaotic order.
>
> > But I don't know enough about the order that these things happen in,
> > nor how to tell that from the C file, to trace it all out. Can
> > someone give me a sense - or show me enough of how to do it so I can
> > do it myself - how to track what's being done in complex_number.
> > {pyx,c} so I can tell what modules to try debugging? The Pari stack
> > is good in the whole of gen.pyx, and somehow has been corrupted by
> > integer.pyx, so it would suffice to know what is imported between
> > them.
>
> You can add import hooks to print out whenever a module is imported. I
> put a patch to do this up on trac, can't seem to locate it now.
Oh, that would be wonderful for this! I don't even really know what a
"hook" is, but I assume it would do what you say, which is just what I
need.
> > As a side note, following the sage imports in sage/all.py is a
> > nightmare. A whole bunch of the stuff supposedly imported later is
> > already imported right away, because we import sage/misc/all.py really
> > early on, which imports most functions from sage/misc/functional.py -
> > and that imports quite a bit of "main" Sage.
>
> +1. I would love for this to get better cleaned up.
Is there any particular reason that misc is imported first? Anyway,
this sounds like a terribly huge job.
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