[vtk-developers] TestFixedPointRayCasterLinearCropped failure

[David Gobbi]

I just tried on my ubuntu box.  It shows the same failure with 64 threads.

 - David

On Sun, Feb 24, 2013 at 11:38 AM, 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