Hi all,
I’ve been using vtkSMPTools a bit lately and have some comments. They may be tangential to what you are aiming to do, but here they are anyway:
- Sometimes, I want to pass numbers other than vtkIdType to
vtkSMPTools::For(). For example, I have a sparse set or map whose keys (perhaps hashes for unordered sets/maps) areuint64_tand want to pass a range of keys to consider. Casting to vtkIdType won’t work sincevtkSMPTools::For()does math on its arguments. - Sometimes I want to invoke a “for” loop on every thread without providing work. Is the correct thing to do to call
vtkSMPTools::For(0, vtkSMPTools::GetEstimatedNumberOfThreads(), functor)? If so, that should be documented. If not, can we add a new way to invoke a worklet? An example use-case: I have a functor that does flood-filling and want threads to steal seeds from and insert seeds into a single queue until it is empty. - For the use case above, it would also be nice if there was a way for a thread to ask for its rank and the pool size (similar to
MPI_Comm_rankandMPI_Comm_size). This would allow worklets to do fancier things like lockless writes to a shared queue.
[edit: removed a comment because I confused vtkSMPTools::Initialize() with the functor’s Initialize() method in the discussion above.]