Do multiple time-related filters execute independently?

ParaView Support
1

I have a fairly large dataset and a fairly complicated pipeline and I would like to avoid redundant data loads. Specifically, I perform several clips of the domain, compute several different integrals in each clip and then I want to see temporal statistics for some integrals and plot over time for others.

My question is: does Plot Data Over Tim and Temporal Statistics filters execute independently? It would make sense in this instance to load a new time, update all downstream filters before loading another time step. Is that what happens? Please let me know.

2

PlotDataOverTime and TemporalStatitics are both CONTINUE_EXECUTABLE filters which means they will trigger each a full pass on the timesteps, which can be very heavy as the data will be loaded for every time steps, for each filter.

A way to avoid that is to add a TemporalCache filter after your data reader and set the cache size to the number of timesteps in your data.
This will of course increase memory usage by a lot but you will load each timesteps only once.

1 Like
3

Thanks, @mwestphal. I am going to read into it presently. I didn’t quite appreciate what Temporal Cache filter cache is. Can I just ask if it makes sense to cache the entire data source or the clips or is that the trade off I need to check myself?

4

Oh wow… the difference is quite substantial. Thanks a lot!

5

I would suggest to put it right after your reader unless you do not have enough memory.

6

Sorry, I have unmarked it as a solution as I am not so sure Temporal Caching works in a case I described. Temporal Statistics and Plot Over Time from my different clips still seem to execute independently.

I feel like a simple solution would be to implement a stepper through all time steps and reading values of all my integrals and noting them down somewhere. I could then compute averages and plots over time.

Or maybe what I should do is to group all my integrals into a single data sets and then put Temporal Statistics or Plot Data Over Time on top of it?

7

Of course they do. The temporal cache only avoid reading the timesteps multiples times.

I feel like a simple solution would be to implement a stepper through all time steps and reading values of all my integrals and noting them down somewhere. I could then compute averages and plots over time.

Not supported by VTK. Interesting idea but definitely not trivial.