How to speed up plot with big result

Dear sjwprcker,

sjwprcker said:

My sim result (Interactive.x) is ~ 300G. When I try to plot one signal in viva, it takes me > 1hour to load, which is too slow

My experience with large databases (approaching 1 TB) suggest an hour is pretty good!  It is not unusual to have to wait many hours to both access and post-process large simulation result databases. I can only suggest what I have done in the past to try to minimize the time. These are my personal suggestions only.

1. Reduce the number of saved outputs to as small a set as possible

a. If using an extracted view based netlist, make sure you are not saving all fractured nets of a specific schematic node

2. Use the strobepoint feature and only save the strobed timepoints

3. Place all your post-processing and plotting commands in an ocean script to enable background processing and allow them to run while you perform other tasks.

4. Make sure your results database is on the same network (i.e. reduce access time)

5. If you have N outputs, sort them into, say, M groups (M1, M2, M3...). Run the same simulation M times where each simulation has one of the sets of Mi outputs. Although you are running the same simulation M times, your database size will be reduced by a factor of M and hence will expedite your plotting times.

Shawn

Just knowing the overall size of the database is not enough too - is this transient data? Are you using PSF XL output format? Which IC and spectre versions are you using? 

I would strongly advise contacting customer support - I wouldn't in general expect it to be that slow, but having some idea of the nature of the database (are there lots of points, or lots of signals, or lots of separate databases over sweeps/corners etc) would help get a better understanding of where the bottleneck lies. That's not something that's particulary feasible to do on the forums.

Andrew