[issue8745] zipimport is a bit slow

[Goplat]

New submission from Goplat :

Reading the list of files in a .zip takes a while because several seeks are 
done for each entry, which (on Windows at least) flushes stdio's buffer and 
forces a system call on the next read. For large .zips the effect on startup 
speed is noticeable, being perhaps 50ms per thousand files. Changing the 
read_directory function to read the central directory entirely sequentially 
would cut this time by more than half.

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components: Interpreter Core
files: zipimport_speedup.patch
keywords: patch
messages: 105954
nosy: Goplat
priority: normal
severity: normal
status: open
title: zipimport is a bit slow
type: performance
versions: Python 2.6
Added file: http://bugs.python.org/file17387/zipimport_speedup.patch

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[issue8745] zipimport is a bit slow

[Goplat]

Goplat  added the comment:

Zipping up the Lib directory from the python source (1735 files) as a test, it 
took on average 0.10 sec to read the zip before, 0.04 sec after.

(To test the time taken by zipimport isolated from other startup costs, instead 
of actually getting the zip in the import path, I just ran

import time, zipimport; start = time.clock(); 
zipimport.zipimporter("lib.zip"); print time.clock() - start)

--

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