For some time now I've been spawning intensive multicore jobs with nproc-1 or even nproc-2 workers on my Linux laptops. It's too easy to end up with an unresponsive machine when you spawn an all core test/build/compute job - and as nice as enforced "my code is compiling" breaks are people tend to get the wrong idea when they see you on your phone or with a book in hand while you wait.