[vtkusers] Release Memory , correct?

[RIVERA ROLDAN, Jorge Orlando]

One Update

I have tried too:
    gridPointer->GetActualMemorySize()   // After
    gridPointer->ReleaseData();
    gridPointer->Squeeze();
    gridPointer->GetActualMemorySize()   // Before

,and  I  have  omitted   adding an emptyGrid
    /*  vtkSmartPointer<vtkDataSet> emptyGrid;
    level2Pointer->SetBlock(k, emptyGrid):*/

MemorySize After seems to be consistent with my data and  MemorySize  Before  prints 0 (Zero)  but top  indicates  memory is increasing every time I read the Grids again and again  (see:  if (load (cnt) … ) in my  inner for loop )

How come?   maybe  it is my  DownCasting vtkSmartPointer<vtkDataSet>  since  they point to an StructuredGrid, which does not re-implement squeeze or ReleaseData (inherited  from vtkDataSet )

Von: RIVERA ROLDAN, Jorge Orlando
Gesendet: Tuesday, 20. October 2015 09:17
An: vtkusers at vtk.org
Betreff: Release Memory , correct?

Dear  Forums Members,


I  have  a question regarding releasing Memory.

I have a vtkCompositeDataSet   or a vtkMultiBlockDataSet  up to 2 Levels.  Level3 is a Structured or Unstructured  grid, like :

--vtkMB   (root  )
-----vtkMB
---------vtkStructured
---------vtkUnstructured
-----vtkMB

and I  want to release memory  without  destroying my tree structure
I  get through  my tree (simplified code )

for( i=0 ; i< root->GetNumberOfBlocks() ; ++i )
{
     vtkSmartPointer<vtkSmavtkMultiBlockDataSet> level2Pointer=vtkMultiBlockDataSet::SafeDownCast(Root->GetBlock(i));
     for(k=0; k< level2Pointer->GetNumberOfBlocks(); k++)
     {
             If( load(cnt) )
             {
                      vtkSmartPointer<vtkDataSet> gridPointer=ReadGridFromFile(…..)
                      level2Pointer->SetBlock(k, gridPointer):
            }
else
{
                       vtkSmartPointer<vtkDataSet> gridPointer=vtkDataSet::SafeDownCast(level2Pointer->GetBlock(k));
                       gridPointer->ReleaseData();
                       vtkSmartPointer<vtkDataSet> emptyGrid;
                       level2Pointer->SetBlock(k, emptyGrid):
           }
           cnt++;
     } //for k

} //for i


As you can see  I get the  Un/Structured grid  pointed with the gridPointer . I try to release the Memory  an in its place I set an empty grid
All works  really nice, when I want to render a grid, I load it  in first IF  ,  otherwise,  in else will be supposedly  released .  When I see it with top or mem inspector  the  memory is actually  increasing.

So I assume I am doing something wrong  in the else part:

    vtkSmartPointer<vtkDataSet> gridPointer=vtkDataSet::SafeDownCast(level2Pointer->GetBlock(k));
    gridPointer->ReleaseData();
    vtkSmartPointer<vtkDataSet> emptyGrid;
    level2Pointer->SetBlock(k, emptyGrid):

Any help will be appreciated

Thanks !!

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