[Python-Dev] Importing .pyc in -O mode and vice versa (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Sun Nov 5 21:36:51 CET 2006

Aahz schrieb:

Maybe so, but I recently dealt with a painful bottleneck in Python code caused by excessive stat() calls on a directory with thousands of files, while the os.listdir() function was bogging things down hardly at all. Granted, Python bytecode was almost certainly the cause of much of the overhead, but I still suspect that a simple listing will be faster in C code because of fewer system calls. It should be a matter of profiling before this suggestion is rejected rather than making assertions about what "should" be happening.

That works both ways, of course: whoever implements such a patch should also provide profiling information.

Last time I changed the importing code to reduce the number of stat calls, I could hardly demonstrate a speedup.

Regards, Martin

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