[Insight-users] Re sampleImageFilter and multithreading.

[Pete79]

Luis Ibanez wrote:
> 
> 1) Did you enable ITK_USE_REVIEW  in CMake ?
> 2) Did you enable ITK_USE_OPTIMIZED_REGISTRATION_METHODS in CMake ?
> 

Hiyah, thanks for such a prompt reply. From CMakeCache.txt I can gather the
following:
ITK_USE_REVIEW:BOOL=OFF
ITK_USE_OPTIMIZED_REGISTRATION_METHODS-ADVANCED:INTERNAL=1

Are these flags set up to enable the desired functionality? Should I change
anything?


Luis Ibanez wrote:
> 
> 3) Are you reusing the instances of the filter in any way ?
> 

Each instance is always instantiated by New within each thread separately.
There is no object reusing amongst different threads involved. I'm aware
majority of filters are not multithread-safe in such sense. The only thing
is ROI filters use the same image as input, but I assume reading is in
general safe in multithreading scenarios. Besides, I already experimented
with sequential execution of all code by synchronising it by the Critical
Sections. Outcome is still the same though :/


Luis Ibanez wrote:
> 
> 4)  Try calling SetNumberOfThreads(1) on all the instances
>      of the Resample filter, before you call Update on them.
> 

It is already done. Prior to this, threads used to crash by random chance.
Now, at least they don't crash.


Many thanks,
Peter
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