[vtkusers] SetInputData() vs SetInputConnection()

[Maarten Beek]

Some additional info I found:

When I use SetInputConnection(), I see only one object being destructed as well (like with using SetInputData w/o RemoveAllInputs()).
However the memory usage with SetInputConnection() is 378Mb as opposed to 430Mb with SetInputData(): the difference is about 50Mb (the size of the tiff image).

As I said in the earlier email I sent today, I am loading 2 images into 2 different ProcessorClass objects, or at least that's what I think. The images are similar and come from the same file, but the reader (which is destroyed by vtkSmartPointer when it gets out of scope?) cannot be that smart to realize it can tell the ProcessorClass objects to share the image, can it?

Maarten

On , Maarten Beek <beekmaarten at yahoo.com> wrote:
 
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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