[vtkusers] Memory allocation problems under Python wrapped VTK in Windows

[John Drescher]

On Fri, Jan 16, 2009 at 3:36 PM, John Drescher <drescherjm at gmail.com> wrote:
>>> Is this a problem of memory fragmentation?
>>>
>>>   Jim
>>
>> No it seems not to be as I can execute that non-VTK program and Python
>> wrapped VTK code in any which order and the result is always the same.
>>
> It better be. However I do not believe that makes a difference to your
> situation. Every program gets its own clean address space when you
> execute it.
>
> As far as address space fragmentation, unless you use the /3GB flag
> and link with LARGE_ADDRESS_AWARE the maximum single allocation I have
> found in windows programs ( compiled with VS and no VTK) is around
> 1.2GB. The reason is that windows loads its dlls inside of the same
> 2GB of address space that you are allocating memory from so this
> reduces the maximum size of the block you can allocate. Running python
> probably makes this worse by the python dlls being loaded at even
> lower addresses than the windows dlls.
>

Here is a link about this:

http://www.tech-archive.net/Archive/Development/microsoft.public.win32.programmer.kernel/2005-04/msg00457.html

John