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It's not necessarily 'compiling' on multiple cores, just running multiple make commands. The performance increase would depend on how many tasks could be run synchronously ( parallel ) inside the one makefile or whether you're building multiple applications at once.
A bit of testing may help decide whether it's worth it
Last edited by kbp; 01-27-2010 at 11:26 PM.
It's actually just my tinker-toy so while building something I'm generally just surfing around for info on whatever it is I'm doing. The OS perceives my machine to have 8 cores so even at 4 cores being used to build the kernel, top indicates under 50% CPU load which seemed like a waste to me.