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.
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
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