[vtkusers] memory leak in vtkStructuredPoints or am I doing something wrong?

[RobertS]

Thank you for the information David.
I also noticed that when I'm loading new files the memory usage is not
increasing (unless I load more files than before). I just haven't seen this
behavior in linux before and also the fact that with some datasets it
actually frees the memory is weird.
Robert


David Lonie-2 wrote
> Hi Robert,
> 
> I took a look at your test case (thanks, btw -- these help a lot!) and
> while I can reproduce the results, it appears that linux is just caching
> the memory for the process, not leaking it.
> 
> I modified your script to do 50 cycles of load/clears, with this result:
> 
> ./vtkbug
> 
> Press 1 for zebra, 2 for phallucia
> 
> 
> 1
> 
> 
> Data loaded: 352 MB in use.
> 
> 
> Data cleared: 248 MB in use.
> 
> 
> Data loaded: 378 MB in use.
> 
> 
> Data cleared: 378 MB in use.
> 
> 
> Data loaded: 352 MB in use.
> 
> 
> Data cleared: 352 MB in use.
> 
> 
> Data loaded: 352 MB in use.
> 
> 
> Data cleared: 352 MB in use.
> [snipped 45 load/clears]
> Data loaded: 378 MB in use.
> Data cleared: 378 MB in use.
> 
> While the memory is still marked as reserved by the process, it doesn't
> grow, and the 'leaked' memory is reused by later allocations.
> 
> I also verified that the dataset destructors are being called at the
> appropriate times, and valgrind confirms that no memory is leaking at
> exit.
> 
> I did a quick google search for clearing linux memory caches, and it
> appears that it may be possible to instruct linux to drop the cache if
> this
> is causing problems, but I suspect the operating system will reclaim
> cached
> memory when it starts running out. Unless you start seeing memory
> allocations fail or excessive swapping, this can likely be ignored.
> 
> HTH,
> Dave
> 
> On Tue, Jun 21, 2016 at 2:36 AM, RobertS <

> spir.robert@

> > wrote:
> 
>> Hello all,
>> I'm doing visualization of series of 3D volumes stored in VTK files.
>> First
>> I
>> load all vtk files to vector of vtkStructuredPoints using this simple
>> code
>> inside cycle
>>
>> vtkSmartPointer
> <vtkStructuredPointsReader>
>  reader =
>> vtkSmartPointer
> <vtkStructuredPointsReader>
> ::New();
>> reader->SetFileName(filename);
>> reader->Update();
>> ptsCopy = vtkSmartPointer
> <vtkStructuredPoints>
> ::New();
>> ptsCopy->DeepCopy(reader->GetOutput());
>> loadedPoints.push_back(ptsCopy);
>> reader->CloseVTKFile();
>>
>> then when I want to change the dataset I just call loadedPoints.clear()
>> and
>> start loading other vtk files.
>> Now on windows, everything goes as expected, by calling .clear() memory
>> get
>> freed. This is not the case in linux, here the memory is stil occupied
>> and
>> since I'm working with very large datasets (>12GB) this is a serious
>> problem.
>> Now another interesting thing is, that with some datasets the memory gets
>> cleared even in linux, but with some others it doesn't...
>> I'm using VTK 7.0 compiled from source, vs2015 in windows, gcc6.1 in
>> linux
>>
>> I made a small project that only loads the vtk files to vector and then
>> clears it, displaying amount of used memory in between. I can reproduce
>> the
>> memory leak with this code in linux, in windows it clears the memory.
>> http://tesla.math.sk/vtkbug.7z
>> Here you can download two datasets, zebra is causing the leak, phallusia
>> is
>> not
>> http://tesla.math.sk/zebra.7z
>> http://tesla.math.sk/phallusia.7z
>>
>> Thanks for any help
>>
>> Robert Spir PhD
>> Department of Mathematics
>> Slovak University of Technology
>> Radlinskeho 11
>> 813 68 Bratislava
>> Slovakia
>>
>>
>>
>>
>>
>> --
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