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When i run top command, it prints as follows in third line

0.1%us 0.2%sy 0.1%sy 0.0%ni 99.5%id 0.1%wa 0.0%hi 0.0%si 0.0%st

i want to know what does the line mean ? thanks

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Shows CPU utilization details. “0.1%us” user processes are using 0.1%; “0.2%sy” system processes are using 0.2%; “99.5%id” percentage of available cpu; “0.1%wa” time CPU is waiting for IO.

When first analyzing the Cpu(s) line in top look at the %id to see how much cpu is available. If %id is low then focus on %us, %sy, and %wa to determine what is using the CPU.

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  • Hi Rajat, I still hava a question with top. I notice that, the id% is 94%, but the total 'CPU%' of user processes is 12% or 13%, why it is not 6% ?
    – larry
    Dec 21, 2010 at 8:04
  • The process percentages are in terms of 1 CPU, while the numbers on the third line are in terms of all CPUs.
    – rakslice
    Feb 14, 2012 at 6:40

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