On Thursday 28 December 2006 07:27, Carlos Nieves wrote: > > I'm trying to simulate a circuit with LTSpice, and I'm > > getting an amazing simulation speed of 30ps of simulated > > time by one real second, using a Pentium 4 machine at 3Ghz.
Why do you think that is amazing? > > I want to try gnucap and see if it can go faster. I would like to know too. My guess: maybe, maybe not. There are lots of factors. Just because one benchmark is faster on one than the other doesn't mean any other will be. I suspect that large circuits will run faster on gnucap, small circuits will run faster on LTspice. I have one benchmark that runs in 40 seconds on gnucap, 8 hours on NGspice. A couple of years ago I tried a similar one on LTspice. I gave up waiting for it. Gnucap ran in a few seconds. Gnucap does well when it can optimize well, not so well when it can't. Most Spice simulators don't try to optimize, but start from a faster base, by not having the overhead associated with optimization and mixed-mode. > > I can generate the spice netlist, but as one of the > > components I'm using is from Linear, its model is a .sub > > binary file included with LTSpice. > > > > So I guess the .sub model is a propietary format and I > > can't use gnucap for this simulation. Am I right? Welcome to proprietary lockin. That's what LTSpice is all about. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user