[Paraview] Memory leak with Catalyst

Fri May 20 16:17:49 EDT 2016

Thanks for the advice Burlen -- I haven't used Massif before, so this is a good opportunity to give it a try.

The initialize/finalize each time approach doesn't work either. I am calling the Finalize() routine on the vtkCPProcessor class but then when it tries to initialize again, it throws:

Warning: In /data4/ParaView/VTK/Parallel/Core/vtkSocketController.cxx, line 50
vtkSocketController (0xa4342f0): Already initialized.

and then crashes. So, hopefully I can sort out the memory leak rather than trying to debug why a hacked fix doesn't work!

Tim

________________________________
From: Burlen Loring <burlen.loring at gmail.com>
Sent: Friday, May 20, 2016 3:46 PM
To: Gallagher, Timothy P; Andy Bauer
Cc: paraview at paraview.org
Subject: Re: [Paraview] Memory leak with Catalyst

VTK_DEBUG_LEAKS, although will catch some serious errors, will not catch all kinds of leaks. For example you can have leaks where data erroneously accumulates with each time step, but is deleted at program termination. VTK_DEBUG_LEAKS will not catch that kind of error. It's probably better to use massif to profile your code on a small one node run. There's an excellent tool called massif visualizer to aid in exploring the data generated.

$0.02

On 05/20/2016 11:56 AM, Gallagher, Timothy P wrote:

Hi Andy,

Thanks for the tips. I will get working on the VTK_DEBUG_LEAKS now and see what it turns up.

The initialize/finalize every time is definitely a hack and not for long-term use. But, sponsors want a report on Monday and we need to be able to visualize things for that -- the simulation is too big to write data files and post-process later. So I modified the code to do that for now until I can find a proper fix.

I'll let you know if I get stuck with the log file.

Thanks again,

Tim

________________________________
From: Andy Bauer <andy.bauer at kitware.com><mailto:andy.bauer at kitware.com>
Sent: Friday, May 20, 2016 2:39 PM
To: Gallagher, Timothy P
Cc: paraview at paraview.org<mailto:paraview at paraview.org>
Subject: Re: [Paraview] Memory leak with Catalyst

Hi Tim,

If you build Catalyst with VTK_DEBUG_LEAKS enabled it is pretty good at finding VTK objects that aren't deleted properly. You should be able to run this with a small amount of calls to Catalyst as well. If you try this and want help understanding the output (if an object like a vtkUnstructuredGrid is leaked it will often give a whole bunch of false leaks that the unstructured grid is just holding the references to), just share your output file and I can take a look at it to try and narrow down the culprit. That may be slightly easier to use than Valgrind.

Beyond this, you could maybe try the same run but without doing any Catalyst work to see what happens then. That may be a lot of compute cycles but I'm not sure how else to try and bisect where the memory leak is occurring.

Initializing and finalizing Catalyst every time you want output would probably work but I'd think there may be significant overhead doing it like this. Plus, it's not really solving the problem -- just avoiding it.

Best,
Andy

On Fri, May 20, 2016 at 12:57 PM, Gallagher, Timothy P <tim.gallagher at gatech.edu<mailto:tim.gallagher at gatech.edu>> wrote:

Hi,

One of our users is running a very big simulation and writing out images of two slices (two different views) every 1000 iterations and writing out the data for the two slices (two different data writers) as VTK files every 5000 iterations. It is using Paraview 4.4.

After 21000 iterations, the simulation is killed because the memory on the compute nodes fills up. I usually know how to track down memory problems in our code using valgrind and related tools, but is that the right way to go to try and find this problem?

Are there any tips on how to isolate where the problem may be? I don't know if it is in the adapter, or in paraview itself. Has anybody encountered problems with runaway memory using Catalyst in 4.4 when writing images or VTK files?

I know when we use pvpython to generate images and loop over many files, sometimes the memory also blows up and so we usually move the loop over the files outside the pvpython script and into a driver script that executes a new pvpython for each file. Is there a way to shut down/start up Catalyst each time it needs to write something? Is that advisable?

Thanks,

Tim

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