Re: gnumeric's solver and parallel computing

[Morten Welinder <mortenw gnome org>]

Ouch.  600 is well outside the design range.

You might have to play with neutering parts of the non-linear
solver.  For example, basically turning off the newton steps
because computing the Hessian means something like
2*600*600 recalculations of your target cell.

Also, the polishing steps are probably a waste of time for you.

See also http://www.solver.com/hard-models -- that is written
about a different solver but the basic points apply here too.
Notably

> If the problem is convex, you can have very high confidence
> that the solutions obtained are globally optimal.  If the problem
> is non-convex, you can have reasonable confidence that the
> solutions obtained are locally optimal, but not necessarily
> globally optimal.

M.