Gordon McMillan wrote: > On 28 Feb 2002 at 9:44, James C. Ahlstrom wrote: > >>The other objection raised at the time was the >>possible slow down of imports. >> > > imputil was 30 to 40% slower than C import. iu > is about 10 to 15% slower under normal usage, but > can be faster if you use archives and arrange sys.path > intelligently. I think I can add iu.py as the standard Python importer to my import.c patches. That is, if iu.py can be imported (using C), then it takes over imports. Note that the C code changes to import.c are still required. Also note that iu.py may be in a zip file, and so the import.c changes are still required. >>My code uses os.listdir to cache directory >>contents, but defers its use until the os module can >>be imported using the C import code. >> > > A win over some threshold of number of hits on > that directory; a loss under that threshold. Exactly correct. It is tradeoff between the OS caching directory hits from fopen() versus using a Python cache and os.listdir(). Dramatic gains are obtained when importing from network file systems, an important case. JimA
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