[Insight-users] Multi-threaded Image Registration Examples?

[Oleksandr Dzyubak]

Hi Gaëtan,

Speaking of parallel computing... Correct me if I misunderstood you.
Lets say I want to distribute my image processing over 4 CPUs on a 
single station.
Is that correct to think that ITK does it without my intrusion?
I presume the CMAKE_USE_PTHREADS parameter is ON by default, right?

No parameters in the CMake file should be turned ON/OFF?
Is there any support for MPI or OpenCV?

Thanks,

Alex

Gaëtan Lehmann wrote:
>
> Le 23 juil. 08 à 15:31, Oleksandr Dzyubak a écrit :
>
>> Hi Luis,
>>
>> I finally got money to upgrade my Linux box and soon I'll build
>> a 4 CPU station with 16 GB memory.
>>
>> Quick question.
>> For my work I mostly use smoothing/denoising, segmentation, and 
>> morphology filters.
>> And now I want to benefit from my new 4 CPU station.
>> How can I activate the multi CPU (multi threading) support when using 
>> ITK?
>
> Just do nothing — ITK do it by default for you :-)
> Some morphological filter are not multithreaded though (reconstruction 
> filters for example).
>
> Regards,
>
> Gaëtan
>
>>
>>
>> Thanks,
>> Alex
>>
>> Luis Ibanez wrote:
>>>
>>> Hi Mishali,
>>>
>>> In order to use Multi-threading registration in ITK
>>> you simply should do the following:
>>>
>>>
>>>   0) Get the release of ITK 3.6,
>>>      or a more recent CVS version.
>>>
>>>   1) In the CMake configuration,
>>>      enable the variables
>>>
>>>            ITK_USE_REVIEW
>>>            ITK_USE_OPTIMIZED_REGISTRATION_METHODS
>>>
>>>   2) build ITK
>>>
>>>   3) build your application.
>>>
>>>
>>> At this point, if you use MattesMutualInformation or
>>> the MeanSquares metric, they will run in multiple
>>> threads.
>>>
>>> There is no need to change anything in the code of the examples.
>>> All the examples in Insight/Examples/Registration (that use the
>>> two metrics above) can be used with and without multi-threading.
>>>
>>>
>>> Please give it a try and let us know if you encounter
>>> any problems.
>>>
>>>
>>>
>>>    Thanks
>>>
>>>
>>>       Luis
>>>
>>>
>>> ------------------
>>> Mishali Naik wrote:
>>>> Hi all,
>>>>         I am wondering if anyone can point me to multi-threaded 
>>>> image registration examples? I looked for multi-threaded image 
>>>> registration examples in the Insight package, but didn't find any - 
>>>> so I am wondering if multi-threaded examples are available? thanks 
>>>> a lot!!
>>>> - Mishali
>>>>
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>>>>
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>>
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>
> --Gaëtan Lehmann
> Biologie du Développement et de la Reproduction
> INRA de Jouy-en-Josas (France)
> tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
> http://voxel.jouy.inra.fr  http://www.mandriva.org
> http://www.itk.org  http://www.clavier-dvorak.org
>