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Could you explain more about "user CPU time" and "system CPU time"? I have read a lot, but I couldn't understand it well.
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User time is the amount of time the CPU was busy executing code in user space. System time is the amount of time the CPU was busy executing code in kernel space.
'user' time is the CPU time spent in user-mode code (outside the kernel). 'Sys' time is the amount of CPU time spent in the kernel. This means executing CPU time spent in system calls within the kernel, as opposed to library code, which is still running in user-space.
CPU time (or processing time) is the amount of time for which a central processing unit (CPU) was used for processing instructions of a computer program or operating system, as opposed to elapsed time, which includes for example, waiting for input/output (I/O) operations or entering low-power (idle) mode.
CPU time is a true measure of processor/memory performance. CPU time (or CPU Execution time) is the time between the start and the end of execution of a given program.
The difference is whether the time is spent in user space or kernel space. User CPU time is time spent on the processor running your program's code (or code in libraries); system CPU time is the time spent running code in the operating system kernel on behalf of your program.
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User CPU Time: Amount of time the processor worked on the specific program.
System CPU Time: Amount of time the processor worked on operating system's functions connected to that specific program.
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