On Ubuntu server load graphs I see 4 types of CPU consumption: User, System, Nice and Idle.
What does Nice type mean?
CPU Utilization – What Does ‘Nice’ Mean on CPU Utilization Graphs?
cpu-usagelinux
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Best Answer
It is the CPU scheduling priority, higher vales (+19) mean lower priority, and lower values (-20) mean higher priority (inverse relationship).
man 2 getprioritywill give you lots of details. You can set the nice value when launching a process with thenicecommand and then change it with therenicecommand. Only the superuser (root) can specify a priority increase of a process.