Bugs item #1672332, was opened at 2007-03-02 11:10
Message generated for change (Comment added) made by gbrandl
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Category: Python Library
Group: Platform-specific
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Bartlomiej Ogryczak (oneg)
Assigned to: Nobody/Anonymous (nobody)
Summary: cPickle can pickle, but cannot unpickle on 64bit machines
Initial Comment:
Seems that on 64-bit machines cPickle is able to pickle floats smaller then
DBL_MIN, but it's unable to unpickle them.
64-bit machine (Solaris 10 on Sparc)
Python 2.4.4 (#1, Oct 26 2006, 10:01:37)
[GCC 3.3.4] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> import cPickle
>>> cPickle.dumps(1e-310)
'F9.9999999999999694e-311\n.'
>>> cPickle.loads(_)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
ValueError: could not convert string to float
Same thing works fine on 32-bit machine (P4 with MS Windows)
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import cPickle
>>> cPickle.dumps(1e-310)
'F0\n.'
>>>
----------------------------------------------------------------------
>Comment By: Georg Brandl (gbrandl)
Date: 2007-03-05 21:46
Message:
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I seem to remember that float pickling has been overhauled for 2.5, could
you try with a 2.5 Python and report the results?
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Comment By: Bartlomiej Ogryczak (oneg)
Date: 2007-03-05 16:49
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I forgot to specify, it's 32-bit Python binary. I'm guessing yours is
64-bit binary on 64-bit system?
Some additional info:
gcc --version
gcc (GCC) 3.3.4
$ file `which python`
ELF 32-bit MSB executable SPARC Version 1, dynamically linked, not
stripped
$ ldd `which python`
libresolv.so.2 => /usr/lib/libresolv.so.2
libsocket.so.1 => /usr/lib/libsocket.so.1
libnsl.so.1 => /usr/lib/libnsl.so.1
librt.so.1 => /usr/lib/librt.so.1
libdl.so.1 => /usr/lib/libdl.so.1
libstdc++.so.5 => /usr/local/lib/libstdc++.so.5
libm.so.2 => /usr/lib/libm.so.2
libgcc_s.so.1 => /usr/local/lib/libgcc_s.so.1
libc.so.1 => /usr/lib/libc.so.1
libmp.so.2 => /usr/lib/libmp.so.2
libmd5.so.1 => /usr/lib/libmd5.so.1
libscf.so.1 => /usr/lib/libscf.so.1
libaio.so.1 => /usr/lib/libaio.so.1
libdoor.so.1 => /usr/lib/libdoor.so.1
libuutil.so.1 => /usr/lib/libuutil.so.1
/platform/SUNW,Sun-Fire-15000/lib/libc_psr.so.1
/platform/SUNW,Sun-Fire-15000/lib/libmd5_psr.so.1
----------------------------------------------------------------------
Comment By: Santiago Gala (sgala)
Date: 2007-03-05 16:38
Message:
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FYI: it doesn't happen for me in python 2.4.3, 2.5svn and 2.6svn built on
linux (x86_64) with gcc-4.1.2, so it looks compiler version or hw platform
specific.
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