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Hi Rob, <br>
<br>
Check itkImageSource, this abstract class has the methods to create
a multithreaded algorithm. <br>
<br>
virtual void ThreadedGenerateData(const OutputImageRegionType&
outputRegionForThread, int threadId );<br>
virtual void AllocateOutputs(); <br>
virtual void BeforeThreadedGenerateData(); <br>
virtual void AfterThreadedGenerateData();<br>
<br>
If they are implemented then when update is called, the algorithm
will divide the image and call the corresponding number of threads.<br>
<br>
bye,<br>
<br>
Le 26/07/2011 00:03, robert behan a écrit :
<blockquote
cite="mid:CAP0zzh1LAH6-D9e-tUipvuW7Mf_O3BKGYcWTJVJ7b3gS3BnZvA@mail.gmail.com"
type="cite">
<pre wrap="">Hi there,
I am developing an application for reconstructing MRI images and
performing real time image processing ( i,e image processing ) as I
would like to explore the effect of mutlitthreading on execution speed
I am not exactly sure how multi-threading works in ITK so I would
appreciate some guidance on this. Please correct me if any of the
following is incorrect:.
I originally assumed the user would have to write the code themselves
if they want to implement multithreading, but as I understand it you
are only required to do this if you are writing your own custom
filter? In which case multithreading is already implicitly implemented
in a lot of the ITK filters and is automatically used if your code
runs on a multi-core processor?
For example, if I apply the FFT filter to some kspace data, will it
automatically execute on the 4 processors of my machine or do I need
to explicitly tell it to do do?
I presume if no multithreading libraries are specified when building
iTK in cmake then the code will automatically execute on one
processor?
I did build ITK and checked the CMAKE USE WIN32 THREADS so I think my
code should automatically run on the four processors but I am not sure
how to check this? I checked the windows task manager when I executed
my code and the four processors appear to fire up but I would like to
verify this somehow in ITK?
Also how can I set the number of processors I want my code to run on?
Any guidance would be much appreciated,
Rob
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</pre>
</blockquote>
<br>
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