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<DIV>Hi</DIV>
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<DIV>You can also use itkStreamingImageFilter for to specifiy the number thread
per image division.</DIV>
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<DIV>Alex</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=prieto@creatis.insa-lyon.fr
href="mailto:prieto@creatis.insa-lyon.fr">Juan Carlos Prieto</A> </DIV>
<DIV><B>Sent:</B> Tuesday, July 26, 2011 1:57 PM</DIV>
<DIV><B>To:</B> <A title=insight-users@itk.org
href="mailto:insight-users@itk.org">insight-users@itk.org</A> </DIV>
<DIV><B>Subject:</B> Re: [Insight-users] Multithreading in ITK</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">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>
<DIV class=moz-signature>-- <BR>Juan Carlos Prieto <FONT color=grey size=2
face=arial><BR>Phd Student <BR><A
href="http://www.creatis.insa-lyon.fr">CREATIS</A> Tel:+33472438918 <BR>7 Av
Jean Capelle <BR>69621 Villeurbanne Cedex <BR>France <BR><A
href="http://www.creatis.insa-lyon.fr/%7Eprieto">Personal page</A> </FONT></DIV>
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