It actually goes to sleep while the kernel performs that work, and wakes up Note that if an application tries to read from disk or write to network, ![]() User: The CPU is running code in user-mode.System: The CPU is running kernel code.So what “types of tasks” are there? The obvious ones are “user” and “system”: Should really be using the value of sysconf(_SC_CLK_TCK) instead. Note: Technically the magic number 1/100 may be different for your system – you These counters are maintained by the kernel itself, and can be read from the If a CPU executes userĬode for 1 second, it’s user-code-counter will get incremented by 100. Particular task type, that counter is incremented. Maintained, so that while sampling if you see that a CPU is executing a Noting down what type of task each one is executing. Now imagine someone taking a look at all the CPUs every 1/100th of a second, and ![]() Independently schedulable execution unit. In Linux, the hyperthread is the most granular, Physical processors in a machine, each with multiple cores, and each core with In this context, a single CPU refers to a single (possibly CPU Usage is a picture of how the processors in your machine (real or virtual)
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