[vtk-developers] vtk-developers Digest, Vol 68, Issue 43

[L.J. van Ruijven]

Hi Olivier,

I worked on a similar system (win32, 4 GB RAM, Visual Studio, C++) and experienced the same problems. 250 MB was really the upper limit for this configuration.

There is a Matlab utlilty (I forgot the name) that can give an overview of the memory usage. It seemed as if Windows loads its drivers at random in memory. So a reboot did not help very much.

When I switched to 64-bit windows all memory issues were gone. I have loaded image files of 5 GB. And the total memory usage has even reached 11 GB. Also 64-bit Python and TCL/TK run OK. But I never tried to use VTK with C#.

Succes,
Leo.


>  Hello,
>  
>  I tried to reboot my pc (windows xp 3 Gb ram), I tried to another PC,
>  and I found that this limit seem to be around the same value, all the
>  time during my tests.
>  
>  I continue to investigate.
>  
>  Thank you
>  Olivier
>  
>  On Wed, 2009-12-16 at 10:23 -0700, David Gobbi wrote:
>  > Hi Oliver,
>  > 
>  > There are no hidden memory limits in VTK, but the vtkImageData object
>  > will always allocate the whole image as one contiguous block of
>  > memory.  On Win32 systems this is a problem, because Win32 suffers
>  > from memory fragmentation, i.e. if it has been a long time since your
>  > last reboot then even if there is a lot of memory available, it is
>  > only available in relatively small chunks.
>  > 
>  > Sometimes just rebooting will solve the problem.  Or you can move 
> to a
>  > system that doesn't suffer so badly from memory fragmentation, like
>  > 64-bit WinXP.  I also seem to remember reading somewhere that Windows
>  > 7 has reduced memory fragmentation.
>  > 
>  >    David
>  > 
>  > 
>  > On Wed, Dec 16, 2009 at 9:45 AM, Olivier Robin
>  > <Olivier.Robin at bioclinica.com> wrote:
>  > > Hello,
>  > >
>  > > I am working under project using vtk (the Activiz version), under 
> window
>  > > XP SP1, visual studio. my project is in c#.
>  > >
>  > > when I use object like vtkImageData, or vtkUnsignedShortArray, 
> and try
>  > > to allocate memory, I have a low memory limit, around 90 Mbyte, 
> may be a
>  > > little bit more.
>  > >
>  > > is there an officially limit in using memory with theses object (My
>  > > vtkImageData would like to use more than 110 Mbyte, because I 
> have a
>  > > Dicoml SErie with more than 1600 slices) ?
>  > > is there a way to modify trhis limit ?
>  > >
>  > > thank you for any feedback
>  > > Olivier
>  > >
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