Tres Seaver wrote at 2008-8-28 15:22 -0400:
>I don't think zipped eggs are a win in any real scenario, except
>possibly the goofy file-count-limited GAE. I would strongly prefer that
>you revert this one change (you can override it in your own
We have observed a drastic speedup (on both Windows and Linux)
in import time (about 30 %) when we have put our complete
(large) application (consisting among others of Zope 2, CMF, Archetypes)
in a (single) zip file.
The probably reason:
Python's module lookup is very expensive.
It makes about 5 pokes on each entry in "sys.path".
These become "stat" for directory entries.
Looking into an in-memory zip content table is much faster
than a filesystem "stat".
As the use of eggs drastically increases the number of entries
in "sys.path", Python's imports are likely to get slower.
However, I am not sure whether our observations for a single
large zip (in fact, we use two: one for our application, the other for Python's
runtime library) is valid for the case of many small zipped eggs.
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