[Paraview] some more questions about Catalyst

Tue Jan 3 03:38:40 EST 2017

Hi Andy,

Thanks for your reply! Now I can run the CxxFullExample, but I've encountered some more problems about it.

1.The CxxFullExample has a 70x60x44 unstructured grid, and it runs relatively quickly. A truncated sample output of Timer Log is as follows:

RenderView::Update,  0.161069 seconds
PVTrivialProducer::GatherInformation,  0.051133 seconds
vtkSMDataDeliveryManager: Deliver Geome,  0.336371 seconds
    FullRes Data Migration,  0.336246 seconds
Still Render,  0.034509 seconds
RenderView::Update,  0.149692 seconds
PVTrivialProducer::GatherInformation,  0.051577 seconds
vtkSMDataDeliveryManager: Deliver Geome,  0.322268 seconds
    FullRes Data Migration,  0.322144 seconds
Still Render,  0.033618 seconds
RenderView::Update,  0.156578 seconds
PVTrivialProducer::GatherInformation,  0.051578 seconds
vtkSMDataDeliveryManager: Deliver Geome,  0.342933 seconds
    FullRes Data Migration,  0.342809 seconds
Still Render,  0.033976 seconds

However, after I modified the grid to a 700x60x44 one and nothing else were modified, it became fairly slow when running. Also, a truncated sample output of Timer Log:

RenderView::Update,  1.48987 seconds
PVTrivialProducer::GatherInformation,  0.493497 seconds
vtkSMRepresentationProxy::GetRepresente,  2.44198 seconds
vtkSMDataDeliveryManager: Deliver Geome,  0.480933 seconds
    FullRes Data Migration,  0.480786 seconds
Still Render,  0.116726 seconds
    OpenGL Dev Render,  0.020361 seconds
RenderView::Update,  1.51507 seconds
PVTrivialProducer::GatherInformation,  0.493821 seconds
vtkSMRepresentationProxy::GetRepresente,  2.47383 seconds
vtkSMDataDeliveryManager: Deliver Geome,  0.481844 seconds
    FullRes Data Migration,  0.481686 seconds
Still Render,  0.116896 seconds
    OpenGL Dev Render,  0.020697 seconds
RenderView::Update,  1.50415 seconds
PVTrivialProducer::GatherInformation,  0.491896 seconds
vtkSMRepresentationProxy::GetRepresente,  2.44277 seconds
vtkSMDataDeliveryManager: Deliver Geome,  0.474105 seconds
    FullRes Data Migration,  0.473959 seconds
Still Render,  0.114223 seconds
    OpenGL Dev Render,  0.020254 seconds

Comparing the two outputs, I find that the time spent in some processes became about 10  times longer, as the dataset became 10 times larger, but some other processes didn't  take 10 times longer time. The biggest difference is  vtkSMRepresentationProxy::GetRepresente, which takes more than 2.4s per frame in the bigger dataset example while in the smaller dataset example it takes less than 0.01s per frame. I don't know what the program does in the vtkSMRepresentationProxy::GetRepresente method. Actually I only know about Still Render. Could you please give me a brief introduction to these items? And, as Catalyst is designed for in situ visualization of very large dataset, is there any method to make the example run faster?

2.When I create Catelyst Python scripts in the ParaView GUI, I have to enable all of the Live Visualization, Output to Cinema and Output rendering components i.e. views options to get live visualization of the simulation in the PV GUI, but under this setting, it generates lots of pictures, which I don't need. If I don't enable either of Output to Cinema or Output rendering components i.e. views, I could not get the live visualization, and of course no picture is generated. But what's the function of the Live Visualization option?

All of the above are situations in the PV 4.4.0 in the client-server mode. As for PV 5.2, I have some problems in using it in the client-server mode. Hope you can help me. Thank you again!

-Zhang

-----原始邮件-----
发件人: "Andy Bauer" <andy.bauer at kitware.com>
发送时间: 2017年1月2日 星期一
收件人: "张驭洲" <yzhzhang at ipe.ac.cn>
抄送: "paraview at paraview.org" <paraview at paraview.org>
主题: Re: [Paraview] How to start the Catalyst example: CxxFullExample

Hi,

The Catalyst examples have been moved to the ParaView source repo. I'd recommend using the newest version of ParaView as well as Catalyst since there have been a lot of improvements since PV 4.4.

For the  CxxFullExample, if you've built it with Catalyst enabled you can run it as you've done as well as pass in Catalyst Python scripts to use through command line arguments.

Andy

On Fri, Dec 30, 2016 at 10:08 PM, 张驭洲 <yzhzhang at ipe.ac.cn> wrote:

Hello everyone,

I'm learning the ParaView Catalyst by starting at the CxxFullExample, which is one of the Catalyst examples from https://github.com/Kitware/ParaViewCatalystExampleCode-MOVED-. I have compiled and built it and got the CxxFullExample executable. It is said that it's a full example of a simulation code interfacing with Catalyst, but I don't know how to execute it. I typed "./CxxFullExample" in the command line under the build directory of the example and nothing happened. I read the Chapter 2 of the Catalyst User's Guide and found what's  mainly discussed is about creating ParaView Catalyst scripts in ParaView. It is said that to create ParaView Catalyst scripts in ParaView, I must have a representative dataset, and the Appendix 7.1.2 of the guide has a script that can be used to create the dataset. I managed to get lots of files named "filename_x_x.vtu" and "filename_x.pvtu"(x is a number) by typing "./CxxFullExample ./pvpython python.py"(python.py i s the script from the appendix 7.1.2 of the user's guide) in the command line under the bin directory of ParaView 4.4.0. Then I followed the section 2.2 of the user's guide with one of the file I generated above, only to get another script. Actually, what I want is a condition shown at www.kitware.com/blog/home/post/722, but after read the section 2.3 of the user's guide, I'm still unable to implement it. How should I organize the Catalyst enabled simulation and ParaView? Can it work in the client-server mode? Can I get it to work without much knowledge of Python? Maybe I'm on the wrong way of learning Catalyst, if so, you can ignore my questions and just tell me the right way. Thanks a lot!

-Zhang

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