[Insight-users] multi threading in ITK

[Steve M. Robbins]

On Thu, Jun 14, 2007 at 01:05:22PM +0200, Ruben Schilling wrote:
> Hi,
> 
> I just wondered, if anybody knew how exactly I enable multi-threading  
> in the multi-threading capable filters of ITK? 

From what I can gather you need to do nothing; it is all taken
care of magically.  See also this thread:
http://public.kitware.com/pipermail/insight-users/2007-May/022281.html


> I have seen, that  
> these capable filters have a SetNumberOfThreads (int t) method to  
> specify the number of threads. However when I set it that way and run  
> "top" to monitor my system on the command line I never actually saw  
> more than one core busy with my program (I have 2 CPUs each having 2  
> processor cores, that I can observe from top).

My guess is that you're not using any parallelizable filters.

You should be able to write a simple program that tells you how many
cores ITK detects.  Here's one I wrote for the analogous functionality
of VTK.


#include <vtkMultiThreader.h>
#include <iostream>


int main( int ac, char* av[] )
{
    vtkMultiThreader* vmt = vtkMultiThreader::New();
    vmt->Print( std::cout );
    vmt->Delete();

    return 0;
}


Cheers,
-Steve
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