[Insight-users] parallelization

[Mauro Maiorca]

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
>