[SOLVED] How to use ParallelVisitorScheduler

[Garibalde]

I am trying to parallelize the visitors. I see that there is already a class created for this ParallelVisitorScheduler. However i am no sure how use it. I need to replace the existing executeVisitor() with the one from ParallelVisitorScheduler. How would i do this? is there a function association?

Thanks

[Guillaume]

Hi Garibalde,

Mixing threads and Visitors is a complex and still running task.

I just had a look at ParallelVisitorScheduler. This is a very old abstract class created in 2007 and not used anymore in SOFA.
Still, the algorithm looks OK so you should be able to use it : simply create your own Scheduler inheriting from ParallelVisitorScheduler and specify what to do with threadsafe Visitors in executeParallelVisitor() function.
Then, to use it, replace your node->execute(visitor) calls to MyPVS::executeVisitor(node, visitor) calls.

Unfortunately that’s all I can say since I’m not yet a SOFA expert.
Could someone else help us here ?

Hope it helps,
Guillaume

[fspadoni]

Hi Garibalde,

ParallelVisitorScheduler was developed for a project to parallelize SOFA using KAAPI multithreading library http://kaapi.gforge.inria.fr/ but there is no more support.

As far as I know no one is still working on it.

I implemented in my project some basic task based parallelism in Sofa using the Multithreading plugin.
That’s not a default SOFA plugin and it has a boost thread library dependency.
Maybe it can be helpful

Federico

[Garibalde]

Hi fspadoni and Guillaume,

Thanks for your replies.

Fspadoni, Do you use the multthread plugin in SOFA to accomplish this? I would like to paralllelise some of the tasks also in my scene to get better performance.

Any help would be great.

Thanks
Garibalde

[fspadoni]

Yes I used the Multithreading plugin

The plugin provides just a task scheduler to run concurrently tasks and few basic examples of parallelized components.

The scheduler uses the boost thread library internally but you don’t have to deal with threads.
You should decompose your algorithm in tasks.
A task is just a function that can run concurrently with other tasks.

Federico

[Hugo]

Hi @vmenon,

Did you succeed to use the ParallelScheduler as you wanted?
Can we help any further ?

Best,

Hugo

[Hugo]

Hi @vmenon,

I close the topic after almost a month.
If you need anything more about this, please do not hesitate to create new threads.
Moreover, note that we are currently working in a workgroup about multithreading: issue #24.

Best,

Hugo

[Author]

Posts