Linux top command inside% CPU and cpu (s) of the difference

Some students will engage us%% CPU and Halo, which is shown below in top view information cpu time.

Then some students will ask: Which is right in the end these two CPU.

In fact, all right, but the meaning of the expression is not the same.

The official explained below

Cpu (s): 34.0% us: user space occupied percentage of CPU

% CPU: the last update to the current occupancy percentage of CPU time

Read here I do not fully understand the relationship between the two of them, I always thought% CPU is occupied by cpu percentage of each process, intuitively, the values are added together all processes should be equal to us.

But that is not the case, then we can press 1 at the top interface

At this time we can clearly see the operational status of each have the cpu.

Through the above display we find Cpu (s) represents the average of all the user processes throughout the cpu, because each occupies a percentage of the core, so by comparing the average to count reference significance. The% CPU shows the percentage occupied by a nuclear process, rather than the entire percentage cpu (12-core), and sometimes may be greater than 100, it is because the process enables multi-threaded occupies multiple cores, so sometimes we see the time will be worth more than 100%, but will not exceed the total number of cores * 100.

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