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Oracle VM CPU usage at 100% even if only 3 out of 4 cores assigned

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I'm running a linux VM guest inside a Win10 host. I assigned 3 cpu cores to the VM (out of the 4 cores of my i7 6600K). When compiling some big software package I run make -j3 and then looked at the CPU usage in Win10 Task Manager it's pegged at > 95%. I was naively expecting something around 75 or 80%. Anyone knows what's going on? Screenshot: Here a screenshot of the problem
Asked by Valerio Formato (11 rep)
Jan 14, 2017, 02:48 PM