Could you please be a little more specific with your use of the word "parallel". I ask because, just as the DAC edition of EE Times muddied the water, so does your post. What did you take parallel to mean in the world of circuit simulation?
- Threaded (hyper- or multi-)?
- Multi-core (single or multi-CPU) with shared memory?
- Multi-core (single or multi-CPU) across a network?
And to what class of problems does each "parallel" [sic] simulator you mentioned in your original post best apply?