On Thu, Oct 23, 2008 at 2:20 PM, Georg S. Weber
<[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> just a short update of my findings so far:
>
> 1.) Yes, on a Mac "fs_usage" is exactly the smoking gun needed. It
> prints something like:
>
>
> 22:30:15.446 stat [ 2]
> coerce_maps.pyx
> 22:30:15.446 stat [ 2]
> coerce_maps.pyx
> 22:30:15.446 stat [ 2] /Users/georgweber/
> Public/sage/sage-3.2.alpha0/loca/bin/coerce_maps.pyx
> 22:30:15.446 stat [ 20] sage-3.2.alpha0/local/
> lib/python2.5/site-packages/setuptools-0.6c8-py2.5.egg/coerce_maps.pyx
> 22:30:15.446 stat [ 2] sage-3.2.alpha0/local/
> lib/python2.5/site-packages/SQLAlchemy-0.4.6-py2.5.egg/coerce_maps.pyx
> ...
>
> 2. The locations searched for "integer.pyx", "coerce_maps.pyx", and
> "parent.pyx" in the example of Emmanuel above are exactly the current
> directory, and then (starting again with the current directory) the
> directories listed by
>
> sage: sys.path
>
> (so "stat" is called twice for coerce_maps.pyx without path in front
> of it, as shown above).
>
> 3. Even the innocent line
>
> sage: time for i in range(10): float(1)/2
>
> creates heavy "stat" call actictivity.
>
> 4. The .pyx files *are* side by side their accompagnying .so files,
> under e.g .../site-packages/sage/rings/ one finds both the extension
> "integer.so" as well as (a copy of) the source file "integer.pyx".
>
> 5. Since the functionality works (Sage does its computations), the .so-
> files are obviously found when they are needed. So the mechanism which
> searches for the .pyx-files must be a somewhat different one, because
> it fails.
>
> 6. I still have no idea why "*.pyx"-files are looked after. Even in
> devel/sage/setup.py, they don't really occur, because they are
> replaced by their corresponding *.c resp. *.cpp files (by
> "process_cython_file()") before setup() is called.
The only place in all sage that specifically uses the pyx files is
the source code introspection. I.e., if you type
sage: n = 5
sage: n.floor??
then Sage looks in integer.pyx to see the source code for the floor function.
The pyx files shouldn't be used otherwise.
>
>
> I'm too tired now to formulate the trac ticket, but the title would be
> something like:
> "sys.path is searched ("stat"ed) for *.pyx-files insanely often"
>
> Cheers,
> gsw
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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