[vtk-developers] TestFixedPointRayCasterLinearCropped failure

[Bill Lorensen]

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
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