[vtkusers] For people at kitware : ReleaseDataFlagOn question

[Naveen Kumar Polapally]

I am using mpich-1.2.0  over clan on cluster running Redhat7.1.


>From: "Berk Geveci" <berkgeveci at hotmail.com>
>To: naveenpkumar at hotmail.com, vtkusers at public.kitware.com
>Subject: Re: [vtkusers] For people at kitware : ReleaseDataFlagOn question
>Date: Wed, 07 Nov 2001 17:49:15 -0500
>
>
>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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