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

[Paulo Henrique Junqueira Amorim]

Hi,

you activate this flag to compile the VTK?

also use python but not provided.


Regards,
Paulo


2009/1/17 Lassi Paavolainen <lopaavol at jyu.fi>

> On Fri, 16 Jan 2009, John Drescher wrote:
>
> > 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
>
> Thanks John. I'll check that and test with those flags.
>
> By the way, I was able to get about 1.9 GB on a program compiled with VS
> and no VTK. Using VTK it dropped to 1.2 GB on Vista and to little over 700
> MB on Windows XP Pro. There seems to be some difference between Vista and
> XP as those tests were ran using exactly same compiled code. XP and Vista
> probably load dlls in memory differently. I remember to read somewhere
> that on some XPs there were a bug with some dlls that were load to address
> at 1 GB which of course makes it impossible to allocate a block over 1GB.
>
> Lassi
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