[vtk-developers] TestFixedPointRayCasterLinearCropped failure

[Bill Lorensen]

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
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