[vtk-developers] TestFixedPointRayCasterLinearCropped failure

[Bill Lorensen]

I will bring this test up at Wednesday hack-a-thon. Will you be able to
attend via Google hangout? We could really use you on several issues.

Bill

On Sun, Feb 24, 2013 at 2:44 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> To complicate things further, the mapper uses a multithreaded helper
> filter internally: vtkVolumeRayCastSpaceLeapingImageFilter.  And there
> isn't any way for a user to control the number of threads used by the
> helper other than by setting the GlobalDefaultNumberOfThreads.
>
>  - David
>
> On Sun, Feb 24, 2013 at 12:36 PM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
> > This is a complex test.
> >
> > II had to set the number of threads in the mappers in the included file.
> > Then it fails when I explicitly set the number of threads for the
> mappers.
> >
> > On Sun, Feb 24, 2013 at 1:51 PM, Bill Lorensen <bill.lorensen at gmail.com>
> > wrote:
> >>
> >> Ok, now it fails.
> >>
> >> But, this test has a lot of filters other than volume mappers. If I
> >> explicitly set the number of threads to 1 for each volume mapper, it
> still
> >> fails.
> >>
> >>
> >>
> >> On Sun, Feb 24, 2013 at 1:38 PM, David Gobbi <david.gobbi at gmail.com>
> >> wrote:
> >>>
> >>> I see the failure on my MacBook Pro when I add the following
> >>> lines to the top of the test:
> >>>
> >>>   vtkMultiThreader multithread
> >>>   multithread SetGlobalDefaultNumberOfThreads 64
> >>>
> >>> The lines have to be added to the top (i.e. before the mappers
> >>> are instantiated) in order to take effect.
> >>>
> >>>  - David
> >>>
> >>> On Sun, Feb 24, 2013 at 11:25 AM, Bill Lorensen <
> bill.lorensen at gmail.com>
> >>> wrote:
> >>> > I can't get to to fail on my fedora system. I get a 0 error no matter
> >>> > how
> >>> > many threads I specify. I'll try a couple of other systems I have
> >>> > access to.
> >>> >
> >>> >
> >>> > On Sun, Feb 24, 2013 at 1:17 PM, David Gobbi <david.gobbi at gmail.com>
> >>> > wrote:
> >>> >>
> >>> >> I haven't been able to find the old mailing list discussions about
> >>> >> this topic, but here is the original bug report that I made in 2011
> >>> >> when I noticed the failing regression test.  It gives instructions
> >>> >> that any developer can use to reproduce the bug.
> >>> >> http://www.vtk.org/Bug/view.php?id=12115
> >>> >>
> >>> >> A more recent report from a user who saw the same bug.
> >>> >> http://www.vtk.org/Bug/view.php?id=13420
> >>> >>
> >>> >> I've already fixed a few issues in this volume mapper related to
> >>> >> 32-bit overflow, but this threading bug should probably get the
> >>> >> attention of someone who is more familiar with the code.
> >>> >>
> >>> >>  - David
> >>> >>
> >>> >>
> >>> >> On Sun, Feb 24, 2013 at 10:34 AM, David Gobbi <
> david.gobbi at gmail.com>
> >>> >> wrote:
> >>> >> > Bill,
> >>> >> >
> >>> >> > I can reproduce the failure on any computer by increasing the
> >>> >> > DefaultNumberOfThreads in the multithreader.
> >>> >> >
> >>> >> > Also, this is the "fixed point" mapper, it uses integer
> arithmetic.
> >>> >> > It should produce _identical_ results on all platforms.
> >>> >> >
> >>> >> > I'll see if I can dig up some of my earlier list postings on it.
> >>> >> > I've
> >>> >> > spent many hours investigating this issue, both by myself and with
> >>> >> > other VTK users.
> >>> >> >
> >>> >> >  - David
> >>> >> >
> >>> >> > On Sun, Feb 24, 2013 at 9:57 AM, Bill Lorensen
> >>> >> > <bill.lorensen at gmail.com>
> >>> >> > wrote:
> >>> >> >> David,
> >>> >> >>
> >>> >> >> What makes you think this is a threading issue? The failng error
> is
> >>> >> >> pretty
> >>> >> >> low, <20 on all failing systems and the images look visually
> >>> >> >> similar.
> >>> >> >>
> http://open.cdash.org/testDetails.php?test=178462199&build=2824975
> >>> >> >>
> >>> >> >> Bill
> >>> >> >>
> >>> >> >> --
> >>> >> >> Unpaid intern in BillsBasement at noware dot com
> >>> >
> >>> >
> >>> >
> >>> >
> >>> > --
> >>> > Unpaid intern in BillsBasement at noware dot com
> >>
> >>
> >>
> >>
> >> --
> >> Unpaid intern in BillsBasement at noware dot com
> >
> >
> >
> >
> > --
> > Unpaid intern in BillsBasement at noware dot com
>



-- 
Unpaid intern in BillsBasement at noware dot com
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