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  speed increase due to -j16 as opposed to default -B (mod 7/47)
by cnst (cnst) on Tue Jun 19 20:54:45 2007 (GMT)
  > How much of a speed increase is this? Are we talking like a double in compile speed because you can multithread?

The difference is substantial -- on Intel Core 2 Duo E4300, the time it takes to build OpenBSD's kernel with -B is 4:45, but with -j16 it's only 2:36, i.e. just under 3 minutes, and almost a two-fold decrease in elapsed time. See the link under my name above for some simple benchmarking that I've performed.
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