[Paraview-developers] Release memory

Utkarsh Ayachit utkarsh.ayachit at kitware.com
Thu Oct 22 11:50:36 EDT 2015 

Hi,

Sorry, still wrapping my head around your use-case:

1. What would be a the cause of the RequestData() being called again?
Change in timestep?
2. Each time RequestData() is called, the output data (which is same
as root, I am assuming) will always be initialized, thus it won't have
any structure present. So I am not sure how your reader is working :).
If you have sample code + datafile that you can share, it may make
this easier. I am sure I am just missing something simple in your
workflow, that will help unravel it all :).

Utkarsh



On Thu, Oct 22, 2015 at 11:36 AM, RIVERA ROLDAN, Jorge Orlando
<Orlando.RIVERA at mtu.de> wrote:
> Thanks for  the reply , I will try to explain as concise as I can
>
> The workflow is in the RequestData    the tree Structure is  build the first time a RequetData is called
>
> RequestData(){
>
>      If ( !this->treeBuilt)
>      {
>            buildTree();
>           this->treeBuilt=true;
>      }
>
>      readGrid();
>
> }
>
>
> In buildTree()   I have  built the tree  using the same loop as described   like :
>
> root->SetNumberOfBlocks(10);      // 10 is just an example
>  for( i=0 ; i< root->GetNumberOfBlocks() ; ++i )
>  {
>       vtkSmartPointer<vtkSmavtkMultiBlockDataSet>
>     level2Pointer=vtkMultiBlockDataSet::SafeDownCast(Root->GetBlock(i));
>    level2Pointer->SetNumberOfBlocks(5)  //5 just an example
>      for(k=0; k< level2Pointer->GetNumberOfBlocks(); k++){
>          vtkSmartPointer<vtkDataSet> grid;
>                  grid=vtkStructuredGrid::New()
>                  level2Pointer->SetBlock(k,grid);
>       }
> }
>
>
>  so when  RequesData is triggered  for the very firs time my tree has a fixed structure and in ReadGrid just fill or release the Data  (see original question) in my tree . Moreover, the blocks are always the same meaning :
> level2Pointer->SetBlock(2,grid);    ( block 2 will always have the same grid  same points same connectivity , same fields, etc )
>
> I also take in account that in case a  block is set   cannot be set until  the releseasedata was first caIled
> Ie.    I  should not call
> level2Pointer->SetBlock(2,grid);    twice in ReadGrid() without
>
> {
> gridPointer=vtkDataSet::SafeDownCast(level2Pointer->GetBlock(2));
>  gridPointer->Releasedata();
> }
>
> In between
>
> Thanks again
>
>
> No there is no Other  pluings is just , the reader
>
>
> -----Ursprüngliche Nachricht-----
> Von: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com]
> Gesendet: Thursday, 22. October 2015 16:51
> An: RIVERA ROLDAN, Jorge Orlando
> Cc: paraview-developers at paraview.org
> Betreff: Re: [Paraview-developers] Release memory
>
> Can you elaborate more? I cannot understand how  you're attempting to
> call this code to release memory in a ParaView workflow? Is this being
> done is the reader's RequestData method? Are there any filters
> connected to the reader? Are you showing the output from the reader in
> a view?
>
> On Thu, Oct 22, 2015 at 5:36 AM, RIVERA ROLDAN, Jorge Orlando
> <Orlando.RIVERA at mtu.de> wrote:
>> Dear  Forums Members,
>>
>>
>>
>> I post this on VTK  , so I hope I am not  generating spam
>>
>>
>>
>> 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):
>>
>>
>>
>> PS  I also tried :
>>
>>         gridPointer->Squeeze();
>>
>> and/or  commeting out these lines :
>>
>>        vtkSmartPointer<vtkDataSet> emptyGrid;
>>
>>        level2Pointer->SetBlock(k, emptyGrid):
>>
>>
>>
>>
>>
>> Any help will be appreciated
>>
>>
>>
>> Thanks !!
>>
>>
>>
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> --
> MTU Aero Engines AG
> Vorstand/Board of Management: Reiner Winkler, Vorsitzender/CEO; Dr. Rainer Martens, Michael Schreyoegg
> Vorsitzender des Aufsichtsrats/Chairman of the Supervisory Board: Klaus Eberhardt
> Sitz der Gesellschaft/Registered Office: Muenchen
> Handelsregister/Commercial Register: Muenchen HRB 157206
>
> Diese E-Mail sowie ihre Anhaenge enthalten MTU-eigene vertrauliche oder rechtlich geschuetzte Informationen.
> Wenn Sie nicht der beabsichtigte Empfaenger sind, informieren Sie bitte den Absender und loeschen Sie diese
> E-Mail sowie die Anhaenge. Das unbefugte Speichern, Kopieren oder Weiterleiten ist nicht gestattet.
>
> This e-mail and any attached documents are proprietary to MTU, confidential or protected by law.
> If you are not the intended recipient, please advise the sender and delete this message and its attachments.
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