[ITK] [ITK-dev] Potential BSpline registration problems with ITKv4

[Nicholas Tustison]

Very interesting find, Ali.  Thanks.  Please keep us 
informed of what you find.  It would be nice if a fix
could help us improve the general timing issues that 
we’ve discussed previously with ITKv4.



On Apr 17, 2014, at 9:00 AM, Johnson, Hans J <hans-johnson at uiowa.edu> wrote:

> There was not supposed to be.  The intention was to do the minimal number of changes to allow the same results to occur in ITKv4 instead of ITKv3.  No new features or changes were specified.
> 
> Ali did this work, so he will need to double check, but upon quick review it looks like a simple refactoring from one framework to the other.
> 
> Hans
> 
> 
> From: Nick Tustison <ntustison at gmail.com>
> Date: Thursday, April 17, 2014 at 7:54 AM
> To: Hans Johnson <hans-johnson at uiowa.edu>
> Cc: ITK <insight-developers at itk.org>
> Subject: Re: [ITK-dev] [ITK] Potential BSpline registration problems with ITKv4
> 
> Hans,
> 
> Are there any implementation differences between the two testing
> programs, e.g. different metric class versions?
> 
> Thanks,
> Nick
> 
> On Apr 17, 2014, at 8:24 AM, Bradley Lowekamp <blowekamp at mail.nih.gov> wrote:
> 
>> Hans,
>> 
>> 
>> 
>> I have see a single per-pixel dynamic memory/malloc cause a 10X performance penalty.  Also I have found apple Instruments easy for diagnosing this bottle neck. This is one possibility among many.
>> 
>> Good luck tracking down the issue.
>> 
>> Brad
>> 
>> On Apr 16, 2014, at 9:10 PM, Johnson, Hans J <hans-johnson at uiowa.edu> wrote:
>> 
>>> FYI
>>> 
>>> Ali Ghayoor did the following experiments on "BRAINSFitTest_BSplineScaleRotationRescaleHeadMasks" test.
>>> 
>>> 1) In one of my old build directories, I ran the "BRAINSFitTest_BSplineScaleRotationRescaleHeadMasks" test in BRIANSFitv3 (that uses ITKv3 registration framework). The test was passed successfully in both release and debug types, and it took:
>>> 
>>> 22 second in release
>>> 88 second in debug
>>> 
>>> 2) I built NAMICExternalProject on my system in release type and ran the above BSpline test in BRAINSTools. The test was passed successfully again, but the run time in ITKv4 is tremendously longer than the time that test takes in ITKv3. The test took:
>>> 
>>> 18 minutes using 4 cores
>>> 22 minutes using 1 core (In this case the environmental variable "NSLOTS" is set to 1).
>>> 
>>> ==================================
>>> Basically trying to replicate in ITKv4 the same registration processes of ITKv3.
>>> 
>>> Hans
>>> 
>>> 
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> 
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