[Insight-users] parallelization

[Bill Lorensen]

What hardware, OS and compiler are you using?

On Fri, Sep 4, 2009 at 7:39 AM, Mauro Maiorca<mauromaiorca at gmail.com> wrote:
> Hi Dan & list,
>
> I'm using
> MattesMutualInformationImageToImageMetric
> LinearInterpolateImageFunction
>
> thanks for mentioning the IJ, it's an excellent source of info indeed!
> However, according to the article "Optimizing ITK’s Registration
> Methods for Multi-processor, Shared-Memory Systems" my code should be
> optimized.
> I would be really pleased to see any improvement on a multicore
> architecture (even because I'm planning to register quite big volumes
> using MMI).
>
> Do you have any other clue/test/whatever to solve the problem?
>
>
> cheers,
> Mauro
>
>
> On Fri, Sep 4, 2009 at 8:59 PM, Dan Mueller<dan.muel at gmail.com> wrote:
>> Hi Mauro,
>>
>> Please report to the list what registration components you are using.
>>
>> ie. Linear Interpolator, Mattes Mutual Information Metric, Regular
>> Step Gradient Descent.
>>
>> Only _some_ components have been optimized for parallelization. For
>> which, please refer to the IJ article or the Code/Review folder (look
>> for itkOpt*).
>>
>> Hope this helps.
>>
>> Cheers, Dan
>>
>> 2009/9/4 Mauro Maiorca <mauromaiorca at gmail.com>:
>>> Thankyou very much Dan, John, and  Michael,
>>>
>>> I compiled again ITK with:
>>> ITK_USE_OPTIMIZED_REGISTRATION_METHODS = ON
>>> And still the same excecution time!
>>>
>>> I sent the task to only one processor (exec time 56'14") , four
>>> processors (56'57"), and 8 processors (56'16"). Pretty much the same
>>> time, no matter the number of processors involved in the computation.
>>>
>>> I also tried to add this to the ccmake of my application
>>> CMAKE_CXX_FLAGS   -lpthread
>>> It doesn't make any (significant) difference at all!
>>>
>>> any other clue?
>>> cheers,
>>> Mauro
>>>
>>>
>>>
>>> On Fri, Sep 4, 2009 at 1:10 AM, Dan Mueller<dan.muel at gmail.com> wrote:
>>>> Hi Mauro,
>>>>
>>>> To make use of multiple cores for registration, please set the CMake variable
>>>>    ITK_USE_OPTIMIZED_REGISTRATION_METHODS = ON
>>>>
>>>> This allows some interpolators/metrics to utilize multiple cores. For
>>>> full details, please see:
>>>>    http://www.insight-journal.org/browse/publication/172
>>>>
>>>> Hope this helps.
>>>>
>>>> Regards, Dan
>>>>
>>>> 2009/9/3 Mauro Maiorca <mauromaiorca at gmail.com>:
>>>>> Hello list,
>>>>>
>>>>> I'm wondering whether the ITK code is optimized for running on a
>>>>> multiprocessor machine?
>>>>> I wrote a program to register 2 images but it is quite slow because of
>>>>> many resamplings, so I'm running it on a 8 processor architecture ...
>>>>> but no significant improvements.
>>>>>
>>>>> I'm using Itk 3.14 compiled (linux) with the following flags:
>>>>>
>>>>>  CMAKE_THREAD_LIBS                -lpthread
>>>>>  CMAKE_USE_PTHREADS               ON
>>>>>
>>>>> any suggestion?
>>>>>
>>>>> cheers,
>>>>> Mauro
>>>>
>>>
>>
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