Gentoo users be like
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Why does this option without specifying a number of threads even exist? It might as well be footgun mode.
I'm pretty sure it's "run as many threads as there are cores" mode, though if you're running it in a terminal I always find it best to use nproc-1 or -2 so the machine actually stays usable.
My man pages specify it’s as many as possible limited only to the number of jobs.
Oof, that might as well be a fork bomb then
I don't think I've ever used -j without specifying as many cores as I have, so it sounds completely reasonable.
-j