[vtkusers] memory allocation limit in windows 2000 or vtk ?

[David Netherway]

Thanks John.

I am considering how to subdivide the task but if I want to use a single
renderer at the end of the pipeline the raycaster would still need to
allocate 0.5Gb of memory for shading. Perhaps I need to have multiple
viewports and renderers.

But for now,  I may have to simply subsample the input data.

Regards, David

----- Original Message -----
From: "John Biddiscombe" <jbiddiscombe at skippingmouse.co.uk>
To: "David Netherway" <david.netherway at adelaide.edu.au>; "vtk"
<vtkusers at public.kitware.com>
Sent: Saturday, 10 August, 2002 5:59 PM
Subject: Re: [vtkusers] memory allocation limit in windows 2000 or vtk ?


> David,
>
> I don't know the real cause or solution, but I've had similar trouble
doing operations on very large meshes. My best bet was that although my Ram
+ Virtual mem was large, the largest "continuous block" wasn't big enough
and memory allocations failed. I tried increasing my virtual ram to 5GB, but
it still failed, so I was left confused. I didn't find a solution and
reimplemented one of my key algorithms to run on different inputs. I'm using
win2k, but Borland C++ 6 (so it's an OS issue rather than compiler methinks)
>
> JB
>
> ----- Original Message -----
> From: "David Netherway" <david.netherway at adelaide.edu.au>
> To: "vtk" <vtkusers at public.kitware.com>
> Sent: Friday, August 09, 2002 2:08 AM
> Subject: [vtkusers] memory allocation limit in windows 2000 or vtk ?
>
>
> > Hello All,
> >
> > I attempted to use vtkVolumeRayCastmapper on a volume of size
512x512x1011
> > on a PC with 1.5Gb of RAM.
> >
> > The program will successfully display raycast images if the shading is
> > turned off. The memory usage is then about 1Gb. The program crashes when
I
> > turn on shading at the point where the EncodedGradientEstimator attempts
to
> > allocate (using new) another 0.5Gb RAM.
> >
> > It seemed that either the virtual memory was not working or I had
reached
> > some allocation size limit. The compiler was visual c++ 7 (.net).
> >
> > I tested the first by running the program twice, simultaneously, on an
800
> > slice data set. This worked. The peak memory usage hit approximately
2.5Gb
> > indicating that the virtual memory was working.
> >
> > Does anyone have some suggestions as to what the problem might be?
> >
> > Thanks, David
> >
> >
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