[vtkusers] vtkKdTree threading problem

[amutka]

Dear all,

my problem is related to vtkKDTree::FindClosesPoint which I need to call
from multiple threads. 
If the  code  below is called from a single thread, it takes N seconds, and
if it is called from 8 threads than it takes around 5*N seconds...my results
are 6(single) seconds and 28 (8 cores) seconds....
Each Kdtree is created in separated thread, and also each is build from
separated vtkPoints object....
The problem is in FindClosestPoint which is not fully thread safe from my
experience, even the documentation says different...I have tried
VTKThreading and BOOST threading, no difference.
Do you have any suggestion what could be the problem? Thank you!


        vtkSmartPointer<vtkKdTree> kdTree =
vtkSmartPointer<vtkKdTree>::New();
	kdTree->BuildLocatorFromPoints(somePoints[threadID]);
	double point[3];
	double dist;
	for(int i=0;i<100;i++)
	{
		for(int j=0;j<100;j++)
		{
			for(int z=0;z<100;z++)
			{
				point[0] = i;
				point[1] = j;
				point[2] = z;
				kdTree->FindClosestPoint(point,dist);
			}
		}
	} 




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