If my Kernel's Makefiles have correct dependency information,
To spawn mutliple jobs, I should use this
n = is the number of jobs to spawn
grep '^processor' /proc/cpuinfo | wc -l
It should give You number of CPU's in the system (as seen by OS). You can use this number. Also +1 to this number usualy won't hurt (it depends on project You are building, scheduler in use, etc.).