[M3devel] defaulting to parallel backend?

[Henning Thielemann]

On Mon, 4 Jul 2016, Rodney M. Bates wrote:

> I prefer to use one fewer than the number of processors, so I can
> web browse, read email, review code, etc. while waiting for a
> compile.  The compiler can saturate them all, making any other
> stuff very slow.

Slowdown can happen even earlier if the compilation is bound by disk 
access time.