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Top says 100% CPU used, but 50% of cores idle?

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linux-howto

http://unix.stackexchange.com – top - 08:43:16 up 96 days, 22:16, 1 user, load average: 4.03, 3.92, 3.98 Tasks: 199 total, 1 running, 198 sleeping, 0 stopped, 0 zombie Cpu0 : 0.0%us, 0.5%sy, 50.0%ni, 49.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 0.0%us, 3.9%sy, 46.8%ni, 49.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 0.0%us, 3.0%sy, 47.5%ni, 49.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 0.0%us, 5.0%sy, 45.5%ni, 49.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3593 foldinga 39 19 276m 80m 2972 S 402 1.0 12:55.42 FahCore_a (HowTos)