[Insight-developers] Bad Memory Alloc issue with Large data

[Dženan Zukić]

I don't know whether you solved this problem by now, but let me ask the
obvious:
1. do you have enough memory?
2. are you using 32 bit machine?

If you have enough memory and you have 32bit system, your problem could be
memory fragmentation: there is enough memory, but in chunks smaller than 125
megabytes. This was happening to me so I switched to 64bit system (OS,
compiler, libraries, everything).

HTH

On Mon, Mar 28, 2011 at 20:22, Martin Waitzbauer <mazzok at gmx.at> wrote:

> Hello,
>
> ive written a program that uses 4 filters
> 2 original itk Filters
> "itkVnlFFTRealToComplexConjugateImageFilter.h"
> "itkVnlFFTComplexConjugateToRealImageFilter.h"
> 2 self written
> "GaussMaskImage.h"
> "FFTShiftFilter.h"
>
> The pipeline will be:
>
> itkVnlFFTRealToComplexConjugateImageFilter->FFTShiftFilter1->GaussMaskImage->FFTShiftFilter2->itkVnlFFTComplexConjugateToRealImageFilter
>
> Both gaussmaskimage + fftshiftfilter work as they should on small data, ,
> but the above pipeline will not execute with large data, then i get a bad
> allocation error in the last Filters ->Update() method
> however if i dont include every filter (lets say 3 out of 4, which filter
> doesnt matter) the pipeline works.
>
> ive added a minimal application that creates a 512x512x125 float image,
> which is handed to the begin of the pipeline,
> itkVnlFFTRealToComplexConjugateImageFilter is only executed once
> the remainig filters are executed moreoften
> ive done some simple loops, where one can include/exclude the calculations
> of the other filters
>
> ive seen that for example
> 1,loop of FFTShiftFilter1
> 2,loop of FFTShiftFilter2
> 3,loop of itkVnlFFTComplexConjugateToRealImageFilter
> aswell as
> 1,loop of GaussMask
> 2,loop of FFTShiftFilter2
> 3,loop of itkVnlFFTComplexConjugateToRealImageFilter
> aswell as
> 1,loop of FFTShiftFilter1
> 2,loop of GaussMask
> 3,loop of itkVnlFFTComplexConjugateToRealImageFilter
> will work but
> 1,loop of FFTShiftFilter1
> 2,loop of GaussMask
> 1,loop of FFTShiftFilter2
> 3,loop of itkVnlFFTComplexConjugateToRealImageFilter
>
> will have the last filter return a bad allocation error
> Im a little confused about this behavior and really dont know how to pass
> it by, id greatly appreaciate someone looking into it and having some
> advices for me!
>
> Thanks Big time
>
> Maz
> --
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