[Paraview] large differences in rendering times

[Berk Geveci]

The main difference between ParaView 1.8 and 2.0 are:
* the pipeline change and addition of garbage collection
* new animation support. 
The fact that (3) takes a lot less to render than (1) leads me to
believe that there is additional overhead due to the number of
filters/mappers in the pipeline.  It is hard to say more without
profiling information. I can look into this when I have some free
time. Can I have the data?

-Berk

On 6/8/05, Jean M. Favre <jfavre at cscs.ch> wrote:
> Hi all
> 
> I have been measuring the Still Render time of a subset of an EnSight
> case file with 46 datasets. The subset is made of 12 parts, for a total
> of 85K cells and 43K points, i.e. pretty small stuff.
> 
> I tested 3 options:
> 
> 1) rendering the "Extract Parts" object made of 12 parts.
> 2) Saving it to a *.pvd file (collecting 12 *.vtu) files, reloading and
> rendering
> 3) Use AppendDatasets, save to disk as a single *.vtu file, reloading
> and rendering.
> 
> All renderings are done on a dual-cpu Linux desktop, with Parallel
> Projection, no strips, immediate mode ON, one scalar variable at the nodes.
> 
> With PV 1.8.4 compiled on my linux box (gcc 3.3.5), I get the same
> rendering time () of 0.04 seconds. No problem thus far. That is my
> reference time.
> 
> I switched to PV 2.0.2 and PV nightly and rendering times are up to 30
> times longer.
> 
> Option 1) takes 1.3 seconds
> Option 2) takes 0.10 seconds
> Option 3) takes 0.05 seconds (pretty close to the resulsts of PV1.8.4)
> 
> Can anyone bring some light to this?
> 
> Option 1) being what I use most of the time (to avoid creating all these
> additional *vtu) files, I have seen my application render data at about
> 4/5 seconds per frame (I have many EnSight files, with CAD, external and
> internal CFD, thus with hundreds of datasets).
> 
> Using LOD does not help and every time the window is obscured (by a menu
> pop-up for example), a still render takes place and takes too long...
> 
> I have compared the output of "ldd" on all my executables and they all
> use exactly the same libs (OGL included).
> 
> So, while single dataset visualization seems equal in PV1.8.4 and PV2.*,
> multi-dataset handling sems to have changed a lot between the two
> releases. Or am I missing something?
> 
> Jean
> --
> Dr. Jean M. Favre,                            email:favre @ cscs.ch
> http://www.cscs.ch/about/Favre.php
> CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.40
> Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
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