Re: gEDA-dev: SPICE rawwaveform file

[Anthony J Bybell <netracurse@xxxxxxxxx>]

On Mon, 3 Dec 2007, Dan McMahill wrote:

> I can't speak for Michel, but in this discussion, when I've mentioned
> that a file format should scale to large amounts of data I had 10 Gb or
> so in mind.  However I was envisioning ending up with this amount by
> virtue of having lots and lots (10s of thousands) of waveforms in the
> data file.  So the ability to pick out one of them efficiently and
> without parsing all 10 Gb is important.

Right, that's the "fun" tricky part but it's not insurmountable.  There
are plenty of ways to do this and a lot depends on the access patterns
desired.  (e.g., read one/many waveforms across the whole dump, determine
the values for everything at a given time value t, etc.)

Anyway, if someone has huge spice waves laying around I'd like to take a
look at them as I have some ideas.  Both straight analog circuits as well
as sim runs of extracts of digital designs would be interesting to look
at.  In addition, I'm curious what the resulting database filesizes are
when the spice waves are run through commercial tools (if possible) as
that would give an idea if some non-obvious black magic is going on under
the hood of those tools.

-Tony



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