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Jun 1, 2008, 7:24 PM
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[issue3026] mmap broken with large files on 64bit system
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New submission from Matthew Mueller <donut[at]users.sourceforge.net>:
mmap on large files on 64 bit platforms in python >=2.5 returns some
sort of garbage. In 2.4 it would just throw an exception. Now I get
something like this (script runs md5.md5 on mmap object, and then runs
os.system md5sum for comparison):
This is python2.5 from Ubuntu 8.04 AMD64
/tmp$ python2.5 testbigfile.py
python mmap md5: 1230552d39b7c1751f86bae5205ec0c8
abe59e28c9a3f11b883f62c80a3833a5 *bigfile
This is python svn as of 20080601, compiled the on same system.
/tmp$ python2.6 testbigfile.py
testbigfile.py:5: DeprecationWarning: the md5 module is deprecated; use
hashlib instead
import md5
python mmap md5: 1230552d39b7c1751f86bae5205ec0c8
abe59e28c9a3f11b883f62c80a3833a5 *bigfile
Also note how the python md5 call returns immediately, not something you
would expect when md5ing 4GB of data.
----------
components: Extension Modules
files: testbigfile.py
messages: 67623
nosy: donut
severity: normal
status: open
title: mmap broken with large files on 64bit system
type: behavior
versions: Python 2.6
Added file: http://bugs.python.org/file10500/testbigfile.py
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<http://bugs.python.org/issue3026>
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[issue3026] mmap broken with large files on 64bit system
