Python 32-bit on Windows 64-bit

[Sherm Pendley]

"Martin v. Loewis" <martin at 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