[Insight-users] Resample filter extremely slow after switching from 32 bit to 64 bit on Windows 7

[Kent Ogden]

Interestingly,  I just had the same thing happen to me with the
Adaptive Histogram Equalization filter (VS 2010 Pro and Win 7,
everything compiled in x64).  About 43 seconds to execute in Release
mode, about 15 minutes to execute in Debug.
 
I am also using the multi-res Demons algorithm, and didn't have this
problem (it was faster in 64 bit Debug vs 32 bit Debug mode as I
expected). 

Kent 



>>> John Drescher <drescherjm at gmail.com> 4/18/2012 03:57 PM >>>
On Wed, Apr 18, 2012 at 3:47 PM, Erik Agterhuis
<erik.agterhuis at resolutionbc.com> wrote:
> Dear all,
>
>
>
> I had a nice resample filter running as part of a 32 bit application
on
> windows7. It did the
>
> very simple job of ‘upsampling’ a 3D MRI dataset to a higher
resolution
> using a nearest neighbour
>
> interpolator. Worked like a charm!
>
> Since I kept running into memory allocation bounds elsewhere in the
> application, I just recompiled everything to 64 bit, using VC++
>
> Express 2010. The application runs fine but the resample filter has
become
> extremely slow
>
> (I’m talking 30 minutes versus 30 seconds!).
>
> Since I read earlier postings about avoiding debug mode, I made sure
to
> stick to release mode. Just
>
> added debug information (program database mode). I have traced the
problem
> down to the
>
> ‘ResampleImageFilter< TInputImage, TOutputImage,
TInterpolatorPrecisionType
>>:: LinearThreadedGenerateData(...’
>
> method in itkResampleImageFilter.hxx.
>
> The nested while loop over the output iterator (outIt)  in this
method takes
> ages to finish.
>
> I’ve tried different multithreading settings (even disabling
> multithreading), as some posts elsewhere suggested the problem
>
> might have something to do with that.  As expected on my 4-core
processor,
> having 4 threads is still
>
> the best setting, so this seems to have nothing to do with it.
>
> Any help would be much appreciated!
>

I am not sure what the express versions ( I have never used that)
offer but I have seen slowdowns like this in Visual Studio when going
from Release to Debug meaning I have seen filters take 100 times
longer in debug mode versus release.

John
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