Re: Spice Accelerator Hardware?

"Douglas Mota" <douglasm@xxxxxxxxxxxxx> schrieb im Newsbeitrag
news:1137504753.166437.220360@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > Somebody in this group came up with the idea to use the processors
> > on the graphics card for the calulations. This is useless, because
> > you need 64bit floating point for SPICE. Otherwise a lot of
> > circuits will not run, because of the high dynamic range
> > and resolution required in the matrix solver.
> >
>
> Hi Helmut,
> -"...you need 64bit floating point for SPICE..."
> Is it true even for 32bit Spice versions? Are there 64bit Spice
> versions?

Hello Douglas,

This 64bit floating point math has nothing to do with the operating
system. It only menas that you use 64bits of memory for each variable
or constant. The calculations have to be also accurate for 64bit of
course. It's simply the type (double) in most programming languages.

> -"...a lot of circuits will not run, because of the high dynamic
> range and resolution required in the matrix solver...."
> Since I don't know nothing about this subject, there's my question:
> so the processor on the graphics card does't have this required
> processing power? Only the PC's CPU has it?
>
> I'd really like to study and understand in depth the way Spice works,
> including to learn enough to be able to modify the source code of some
> of its modules. Could you please suggest me some material? It also
> could be some web links and/or key words for searching in Google.
> Thanks a lot!

I have never tried to do that.
For me it's enough that Mike works in this area. :)
Insiders will know of whom I speak.

Best regards,
Helmut







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