Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #55724 > unrolled thread

Re: Python 32-bit on Windows 64-bit

Back to article view | Back to comp.lang.python

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: Python 32-bit on Windows 64-bit "Martin v. Loewis" <martin@v.loewis.de> - 2011-02-11 21:54 +0100
    Re: Python 32-bit on Windows 64-bit Sherm Pendley <sherm.pendley@gmail.com> - 2011-02-11 16:50 -0500

#55724 — Re: Python 32-bit on Windows 64-bit

Am 11.02.2011 19:41, schrieb Craig Yoshida:
> what kind of memory limitations to processes running on 32-bit python
> (with 32-bit C extensions like scipy) have on 64-bit Windows?   I'm
> having occasional MemoryErrors when running a python program on
> 64-bit Windows 7 that runs fine on my OS X machine.  Both machines
> are using a 64-bit OS and have 4GB of RAM.

In addition to the limitations Michel reports: on a 32-bit system,
objects are typically limited to using at most 2GiB, per object
(of course, you could have at most two objects that come close to
this size, since the whole address space would not be larger than
4GiB).

Regards,
Martin

[toc] | [next] | [standalone]

#55947

"Martin v. Loewis" <martin@v.loewis.de> writes:

> Am 11.02.2011 19:41, schrieb Craig Yoshida:
>> what kind of memory limitations to processes running on 32-bit python
>> (with 32-bit C extensions like scipy) have on 64-bit Windows?   I'm
>> having occasional MemoryErrors when running a python program on
>> 64-bit Windows 7 that runs fine on my OS X machine.  Both machines
>> are using a 64-bit OS and have 4GB of RAM.
>
> In addition to the limitations Michel reports: on a 32-bit system,
> objects are typically limited to using at most 2GiB, per object
> (of course, you could have at most two objects that come close to
> this size, since the whole address space would not be larger than
> 4GiB).

IIRC, 32-bit Windows programs are limited to 2GiB, reserving the rest
of the virtual address space for Windows' own use.

Also, 32-bit apps remain 32-bit, even if they're running on a 64-bit
capable OS. Assuming you're running Snow Leopard on your Mac, you're
using a 64-bit Python interpreter *and* a 64-bit OS. You need to have
both to take advantage of a 64-bit memory space.

sherm--

-- 
Sherm Pendley
                                   <http://camelbones.sourceforge.net>
Cocoa Developer

[toc] | [prev] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web