[Insight-developers] Infinite loops

[Lydia Ng]

Hi Dan,

  Linux-2.2.14-5.0smp-c++ 
is definitely running an old version of my
itkImageToImageAffineMutualInformationGradientDescentRegistrationTest

I added some printout statements about 7 days ago,
but they haven't appear in the output.

Lydia
 
> -----Original Message-----
> From: insight-developers-admin@public.kitware.com
> [mailto:insight-developers-admin@public.kitware.com]On Behalf Of Luis
> Ibanez
> Sent: Monday, April 23, 2001 7:28 AM
> To: Daniel J. Blezek, Ph.D.
> Cc: luis.ibanez@ieee.org; insight-developers@public.kitware.com
> Subject: Re: [Insight-developers] Infinite loops
> 
> 
> Daniel,
> 
> 
> I don't have access right now to a Linux machine, so
> I'm trying to identify the problem directly from the 
> code and the outputs on the dashboard. However, something
> seems to be wrong among the outputs reported on the dashboard:
> 
> When you killed the tests, where they still printing output ?
> 
> This is for this morning for 
> itkImageToImageTranslationMeanSquaresGradientDescent
> 
>              Iterations  Answer(should be -7,-3)  Final Message
> 
> Irix:         200      -6.99351  -2.99616         Test passed
> 
> 
> Intel C++     200      -6.99351  -2.99616         Test Passed
> 
> 
> Linux 2.4.0   GetValue() messages are present (as expected)
>               200      -6.99351  -2.99616         Test Passed 
>               But... a segmentation violation is reported at the end.
>  
> 
> Linux 2.2.14  the GetValue() messages are missing(!), the number of
> iterations
>               is not being printed, the reported solution is
>                        -7.15854  -3.00822
>               and a segmentation violation is reported.  
>               This definitely looks like an older version of the test.
>               It seems that the update from the repository have some
> problem... (?)
> 
> SunOS 5.7     Very similar to Linux 2.2.14. Messages added 
> recently are
> missing.
>               The reported output is:
>                        -7.1584  -3.00822
>               and a segmentation violation is reported.
> 
> 
> 
> The tests are explicitly limited to 200 iterations, they shouldn't be 
> going in infinite loops. One possible source of error is that inside 
> the Mapper we are using exceptions to report when a point is outside 
> the range of the target image, the number of these exceptions can be 
> quite large (as high as the number of pixels in the image), and it is 
> not clear how each compiler manage this high flow of exceptions. I'd 
> notice that in VC++ the debuger is overloaded a cause of the 
> high number 
> of exceptions. My guess is that the gcc compiler expects 
> exceptions to 
> be an not so common event (this code could be throwing about 
> 2000 of the 
> in each iterations). In that case we should replace the code:
> 
> 
> try {
>   value =  mapper.GetValue( point );
> }
> catch()
> {
>    value = 0;
> }
> 
> 
> 
> for a "contract" style code with a preconditions like:
> 
> 
> if(  mapper.IsPointInside( point ) ) 
> {
>   value = mapper.GetValue();
> }
> else
> {
>   value = 0;
> }
> 
> 
> 
> I'll remove those test until I can try them on a Linux machine.
> 
> 
> Thanks
> 
> 
> Luis
> 
> -------------------------------------------
> 
> "Daniel J. Blezek, Ph.D." wrote:
> > 
> > Luis,
> > 
> >   When I came in this morning, I killed these jobs which 
> had been running
> > since Saturday morning.  Do you have access to a Linux 
> machine to do some
> > testing?  Oddly enough, it only seems to be affecting my RedHat 6.2
> > machine, not the RedHat 7.0 machine.  Could be a compiler 
> difference.
> > 
> > -dan
> > 
> > >
> > > "Blezek, Daniel J (CRD)" wrote:
> > > >
> > > > Hi all,
> > > >
> > > >   I've had to regularly kill the following tests on Linux
> > > >
> > > > 
> ./itkImageToImageTranslationNormalizedCorrelationGradientDesce
> ntRegistrationTest
> > > > 
> ./itkImageToImageTranslationMeanSquaresRegularStepGradientDesc
> entRegistrationTest
> > > >
> > > > Any ideas where the code may be having a problem?
> > > >
> > > > -dan
> > > >
> 
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