[vtkusers] vtkImageViewer memory usage

[pratik]

Hi,
You can try using this:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/JPEGReader
as a template.
I ran it on Debian Linux and for a 104.9kb file the process is taking 12MB

HTH,
Pratik
On Saturday 18 June 2011 08:24 AM, Suresh Joshi wrote:
> Hello everyone,
>
> Although I don't want to double post and spam the list, I haven't
> heard any responses to a question I posted on May 27th, so I'll give
> it another shot with some updated information:
>
> My question is still the same and I'm wondering why my stock
> vtkImageViewer pipeline (quoted below) is using around 50MB of memory
> on my Windows 7 machine. The jpeg I am displaying is 400x400 pixels.
>
> Also, if I were to create a separate
> Renderer+Window+Interactor+Mapper+etc, the memory footprint should
> still be the same, correct?
>
> Thanks everyone!
> -SJ
>
>
> On Fri, May 27, 2011 at 3:06 PM, Suresh Joshi<sureshj at gmail.com>  wrote:
>    
>> Hello all,
>>
>> I've done a fair bit of Googling, but haven't found many topics about this.
>>
>> In most of my applications dealing with ITK/VTK, I haven't cared too
>> much about the memory used by the viewer, because I'd usually also
>> have a 3D volumetric reconstruction/registration running at the same
>> time, but for the first time I've taken note of the memory used by the
>> viewer window itself.
>>
>> In a naive application (in C++ usually, but for instance in python here):
>> *******
>> reader = vtkJPEGReader()
>> # 27kb JPEG file
>> reader.SetFileName( "Albert-Einstein.jpg" )
>> reader.Update()
>>
>> viewer = vtkImageViewer()
>> viewer.SetInputConnection( read.GetOutputPort() )
>>
>> interactor = vtkRenderWindowInteractor()
>> viewer.SetupInteractor( interactor )
>>
>> viewer.Render()
>> interactor.Start()
>> *******
>>
>> This 'program' seems to use about 50MB of memory on my Windows 7 box
>> (with VTK 5.6). When I place these viewers (in c++) in my
>> applications, I notice a similar usage...
>>
>> Now, the problem for me this time is that I need a less
>> memory-intensive viewer, because I would like to instantiate multiple
>> (lets say at least 10) vtkImageViewers in my app (yet, greedily, I
>> would like to keep similar functionality, with interactions and all).
>>
>> So I guess I have a few questions:
>> a) Is there any documentation anywhere discussing the memory
>> footprints of the vtk viewers/viewports/windows/etc and discussing the
>> best practices when it comes to keeping memory usage down?
>> b) Is my naive approach of creating multiple vtkImageViewers the worst
>> thing I can do (keeping in mind that it gives the exact functionality
>> that I desire right now)?
>> c) Should I be looking at having one renderWindow with multiple
>> viewports instead, with one or more interactors? (And is this
>> noticeably better?)
>>
>> Thanks everyone!
>> -SJ
>>
>>      
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