[vtkusers] SetInputData() vs SetInputConnection()

[Maarten Beek]

I see (only reporting lines with reference to ReferenceCount):

-> activate()
vtkImageData (00000000070808D0):UnRegistered by vtkInformation(...), ReferenceCount = 3

vtkImageData (00000000070ADA70):UnRegistered by vtkInformation(...), ReferenceCount = 3

->deactivate() (without RemoveAllInputs() call)
vtkImageData (00000000070ADA70):UnRegistered by vtkTrivialProducer (...), ReferenceCount = 2

vtkImageData (00000000070ADA70):UnRegistered by vtkInformation (...), ReferenceCount = 1

vtkImageData (00000000070ADA70):Registered by vtkTrivialProducer (...), ReferenceCount = 2

vtkImageData (00000000070ADA70):UnRegistered by vtkGarbageCollectorImpl (...), ReferenceCount = 0


vtkObject (00000000070ADA70): Destructing!


-> activate()
vtkImageData (0000000006FA15D0):UnRegistered by vtkInformation(...), ReferenceCount = 3

vtkImageData (0000000006FB0180):UnRegistered by vtkInformation(...), ReferenceCount = 3

->deactivate() (with RemoveAllInputs() call)
vtkImageData (0000000006FA15D0):UnRegistered by vtkTrivialProducer (...), ReferenceCount = 2

vtkImageData (0000000006FA15D0):UnRegistered by vtkInformation (...), ReferenceCount = 1

vtkImageData (0000000006FA15D0):Registered by vtkGarbageCollectorImpl (...), ReferenceCount = 2

vtkImageData (0000000006FA15D0):UnRegistered by vtkGarbageCollectorImpl (...), ReferenceCount = 0

vtkObject (0000000006FA15D0): Destructing!

vtkImageData (0000000006FB0180):UnRegistered by vtkTrivialProducer (...), ReferenceCount = 2

vtkImageData (0000000006FB0180):UnRegistered by vtkInformation (...), ReferenceCount = 1

vtkImageData (0000000006FB0180):Registered by vtkGarbageCollectorImpl (...), ReferenceCount = 2

vtkImageData (0000000006FB0180):UnRegistered by vtkGarbageCollectorImpl (...), ReferenceCount = 0

vtkObject (0000000006FB0180): Destructing!


It makes sense in my code that I create 2 copies of vtkImageData, loaded into different ProcessorClass objects, but I don't understand why the first copy doesn't get destructed when I am not using 
RemoveAllInputs()

Maarten

On Tuesday, April 29, 2014 10:39:24 AM, Berk Geveci <berk.geveci at kitware.com> wrote:
 
Hmmm. This is fishy. I wonder if there is a leak somewhere in the new code. Can you try something for me? Add a reader->GetOutput()->DebugOn() right after SetInputData() and re-run. Do you see the object reference count go to 0 in deactivate?

-berk



On Mon, Apr 28, 2014 at 11:53 AM, Maarten Beek <beekmaarten at yahoo.com> wrote:

Hi all,
>
>
>I bumped into something I don't really understand:
>
>
>
>void MyClass::activate()
>{
>    vtkSmartPointer<vtkTIFFReader> reader = vtkSmartPointer<vtkTIFFReader>::New();
>    <...>
>    reader->Update();
>
>
>    m_Processor->SetInputData(reader->GetOutput());
>}
>
>
>void MyClass::deactivate()
>{
>    if( 0 != m_Processor )
>    {
>        m_Processor->RemoveAllInputs();
>        m_Processor->Delete();
>        m_Processor = 0;
>
>    }
>}
>
>
>In the deactivate() function I do need the RemoveAllInputs() call to avoid a 50MB memory leak (100 slice 512x512 tiff). I don't need RemoveAllInputs() when I use SetInputConnection(reader->GetOutputPort()) in the activate() function.
>
>
>Why is the difference between SetInputData() and SetInputConnection() with regards to memory management?
>
>
>m_Processor is derived from vtkImageAlgorithm and has an internal pipeline inside the RequestData(), processing the image data with vtkImageConvolve, vtkImageSobel2D, vtkImageThreshold and a few more.
>
>
>int ProcessorClass::RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector* outputVector)
>{
>    vtkInformation* outInfo = outputVector->GetInformationObject(0);
>    vtkImageData* output = vtkImageData::SafeDownCast(outInfo->Get(vtkdataObject::DATA_OBJECT()));
>
>
>    if( this->GetMTime() > this->BuildTime )
>    {
>        this->buildPipeline();
>    }
>
>
>    if( 0 != this->GetNumberOfInputConnections(0) )
>    {
>        this->MergeFilter->Update();
>        output->ShallowCopy(this->MergeFilter->GetOutput());
>    }
>
>
>    return 1;
>}
>
>
>
>
>
>Maarten
>
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