[vtkusers] For people at kitware : ReleaseDataFlagOn question

[Berk Geveci]

Which MPI implementation is this ? On which platform ?

-Berk


>From: "Naveen Kumar Polapally" <naveenpkumar at hotmail.com>
>To: vtkusers at public.kitware.com
>Subject: [vtkusers] For people at kitware : ReleaseDataFlagOn question
>Date: Wed, 07 Nov 2001 22:34:27
>
>hi all,
>For some time now i have been trying to use ReleaseData feature in my
>parallel program but couldn't do so. Now i found out that the problem is 
>not
>with VTK but it is with MPI. It seems we cannot release the memory 
>allocated
>after MPI::Init. I have a simple program here you can check the memory
>consumption on your machine .
>
>I think some thing should be done about it because the release data feature
>is most useful in case of large datasets and parallel programs.
>
>
>#include <iostream.h>
>#include "mpi++.h"
>#include <unistd.h>
>#include <stdlib.h>
>
>int
>main(int argc, char *argv[])
>{
>  MPI::Init(argc, argv);
>
>  int rank = MPI::COMM_WORLD.Get_rank();
>  int size = MPI::COMM_WORLD.Get_size();
>
>  int *Ptr=new int[10000000];
>
>  for(int i=0;i<10000000;i++) Ptr[i]=0;
>  cout<<" allocated  "<<endl;
>  sleep(15);
>
>  delete Ptr;
>  cout<<" just deleted   "<<endl;
>  sleep(15);
>
>  cout << "Hello World! I am " << rank << " of " << size << endl;
>
>  MPI::Finalize();
>}
>
>
>Thanks,
>naveen.
>
>
>
>
>>From: "Naveen Kumar Polapally" <naveenpkumar at hotmail.com>
>>To: vtkusers at public.kitware.com
>>Subject: Re: [vtkusers] ReleaseDataFlagOn question
>>Date: Tue, 06 Nov 2001 22:37:59
>>
>>
>>hi,
>>
>>For some days now i have been complaining that ReleaseData feature is not
>>working for graphical pipeline while it is working for imaging pipeline. 
>>No
>>wonder no one answered, because i was wrong.
>>
>>
>>I am rephrasing my question,for a pipeline shown below the release data
>>machanism is working. But when i parallelize it it does not work.
>>
>>vtkImageReader *reader = vtkImageReader::New();
>>reader->SetDataByteOrderToBigEndian();
>>reader->SetDataExtent(0, 511, 0,511,Mainzmin,Mainzmax);
>>reader->SetFilePrefix("/home/devel/vtk/vtkdata/vfem/slice");
>>reader->ReleaseDataFlagOn();
>>reader->SetDataSpacing(1, 1, 1);
>>
>>
>>vtkSynchronizedTemplates3D *iso =  vtkSynchronizedTemplates3D::New()
>>iso->SetInput(reader->GetOutput());
>>iso->SetValue(0,600);
>>iso->Update();
>>
>>I narrowed my problem to the method shown below.
>>
>>vtkShortArray::~vtkShortArray()
>>{
>>  if ((this->Array) && (!this->SaveUserArray))
>>    {
>>      delete [] this->Array;
>>    }
>>  delete [] this->Tuple;
>>}
>>
>>Both the parallel and sequential executions call this method and both of
>>them delete the this->Array. This is the array which holds all the data of
>>the output of vtkImageReader. But only in case of sequential program  i 
>>see
>>a reduction of memory usage, while in case of parallel program i don't see
>>any change in memory usage. I am unable to explain this as the memory gets
>>allocated in vtkShortArray::Allocate method into Array when you delete it,
>>it has to free the memory.
>>
>>
>>Any help is appreciated.
>>
>>
>>
>>thanks,
>>naveen.
>>
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>
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