[vtkusers] Memory problem

[Raúl Ferriz]

El 15/07/2010 19:15, David Gobbi escribió:
> The quick answer about VTK splitting memory is that VTK image filters
> require the image data to be contiguous in memory.  So splitting is
> not possible.  In summary, large images and Win32 are a bad
> combination in VTK, due to memory fragmentation and the 2GB limit
> mentioned by John.
>
> Actually, I shouldn't speak in absolutes.  Splitting the volume is
> possible, but you would have to write a VTK class that would act as a
> "cache" that contained the volume split into chunks, but that could
> produce contiguous UpdateExtent-sized slabs for use by its consumers.
> As long as the downstream filters only requested one slice at a time
> (or were streamed to only require reasonable-sized blocks) then huge
> blocks of contiguous memory would never be needed.
>
>    David
>
>
> On Thu, Jul 15, 2010 at 10:46 AM, John Drescher<drescherjm at gmail.com>  wrote:
>    
>>> But I have 3 vtkImageReader2 to show every plane (axial, sagittal, coronal)
>>> on his own renderwindow.
>>>
>>>        
>> You are loading a 3D volume 3 times? You definitely do not need to do
>> that for visualization.
>>
>>      
>>> Well, then my only solution is to change my platform ? There is not any way
>>> to force vtk to try split memory allocation when malloc fails? Or force to
>>> use swap when malloc fail?
>>>        
>> The problem is not swap/pagefile. It is that under 32 bit windows
>> (without /LARGEADDRESSAWARE and the /3GB switch) you have a 2GB
>> address space maximum regardless of the amount of ram or swap that you
>> have. Inside this 2GB address space dlls that are needed in your
>> application will fragment this 2GB such that ~1.2GB is the largest
>> single block of address space available.
>>
>>
>> John
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>    
Could anyone point me to an example of who do this?
It would be really appreaciated.

Many thanks.