[vtk-developers] Shared Memory Parallelism in VTK

[Berk Geveci]

It is there in VTK Git master. It is also in the last version I am pretty
sure.

Best,
-berk


On Tue, Mar 17, 2015 at 10:19 AM, jianwei li <ljianweiyx at gmail.com> wrote:

> Hi
>    There is no the <vtkSMPTools.h>  in the VTK source file.Is this a
> unused class,and we have to complete it in the future.
> Best Regard
>      Jianwei Li
>
> 2015-03-17 21:54 GMT+08:00 jianwei li <ljianweiyx at gmail.com>:
>
>> Hi
>>    Now,in my proposal,I want use the implemented paralle methods to
>> implemente the cutting algorithm.But,do you have a guide line for the
>> implemented paralle methods.
>>    Thank you
>> Cheers
>>   Jianwei
>>
>> 2015-03-17 11:17 GMT+08:00 David Gobbi <david.gobbi at gmail.com>:
>>
>>> Hi Jianwei,
>>>
>>> You wouldn't directly use TBB or Kaapi, because VTK provides an abstract
>>> SMP interface.  This doxygen page provides a brief synopsis. The "Functor"
>>> described on the page is a function-like object with the signature "void
>>> func(vtkIdType first, vtkIdType last)" where vtkIdType is an integer type.
>>> Basically, the SMP For() function is given a (first,last) range that covers
>>> the entire data set, and divides it into smaller (first,last) sub-ranges
>>> that the Functor operates on from within the worker threads.
>>> http://www.vtk.org/doc/nightly/html/classvtkSMPTools.html
>>>
>>> To complete the picture, you can take a look at the Kaapi back end and
>>> the TBB back end:
>>>
>>> https://gitlab.kitware.com/vtk/vtk/blob/master/Common/Core/SMP/Kaapi/vtkSMPToolsInternal.h.in
>>>
>>> https://gitlab.kitware.com/vtk/vtk/blob/master/Common/Core/SMP/TBB/vtkSMPToolsInternal.h.in
>>>
>>> So to answer your question, the proposal would be to write (and then
>>> evaluate) an efficient parallel VTK algorithm that uses the abstract
>>> interface described on the first web page.
>>>
>>> Cheers,
>>>  - David
>>>
>>>
>>> On Mon, Mar 16, 2015 at 7:56 PM, jianwei li <ljianweiyx at gmail.com>
>>> wrote:
>>>
>>>> So,do I need to write a proposal to implement anyone algorithm using
>>>> TBB or XKaapi
>>>>
>>>> 2015-03-17 3:59 GMT+08:00 Berk Geveci <berk.geveci at kitware.com>:
>>>>
>>>>> Maybe a brief Wiki page describing the overall volume splitting and
>>>>> static thread assignment would be good. We can put a link from the project
>>>>> page. Beyond that, when/if we pick a student for the project and Google
>>>>> funds it, we can elaborate.
>>>>>
>>>>> -berk
>>>>>
>>>>> On Mon, Mar 16, 2015 at 3:17 PM, David Gobbi <david.gobbi at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> On Mon, Mar 16, 2015 at 12:52 PM, Berk Geveci <
>>>>>> berk.geveci at kitware.com> wrote:
>>>>>>>
>>>>>>>
>>>>>>> David: Is there a reference describing the VTK threaded image
>>>>>>> algorithm infrastructure or do we just point to the code?
>>>>>>>
>>>>>>
>>>>>> There's no reference for vtkThreadedImageAlgorithm that I'm aware of,
>>>>>> though I can write something up on the wiki.   Even though the code itself
>>>>>> isn't very complicated, it would be hard to follow for anyone who isn't
>>>>>> familiar with a) the streaming pipeline and b) the vtkMultiThreader.
>>>>>>
>>>>>>  - David
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>
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