In Mathematica 9 (and earlier for all I know), in Preferences, there is a panel labeled Parallel.
There is a section for local kernels, and you can manually set the number of kernels.
Setting this to 1 should solve your problem.
On Apr 26, 2013, at 4:25 AM, firstname.lastname@example.org wrote:
> I've noticed recently (beginning in v8 or so) that some functions seem to make use of multiple threads internally. For example, Resolve and some linear algebra functions will push my CPU usage up to 400% while they run, even with just one kernel. > > Is there a way to limit this? > > My laptop has a tendency to overheat. For long-running computations, I'd like to be able to say "just use one core" and then just wait longer for the result. >