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Old 08-28-2013, 08:10 PM   #1
Registered: May 2012
Location: San Luis, Argentina
Distribution: Debian
Posts: 204

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Question Meaning of hi, si, and st in top

Hi everyone,
This is the upper section of the output of the top command in my Linux Mint 14 box:
top - 21:02:35 up 59 min,  3 users,  load average: 0.17, 0.18, 0.20
Tasks: 159 total,   1 running, 158 sleeping,   0 stopped,   0 zombie
%Cpu(s):  7.4 us,  1.9 sy,  0.1 ni, 88.9 id,  1.7 wa,  0.0 hi,  0.0 si,  0.0 st
I know that the information that follows %Cpu(s) means the following:
  • 7.4 us: 7.4% of the CPU is being used for user processes (meaning processes outside of the kernel itself)
  • 1.9 sy: 1.9% of the CPU is being used for system (kernel) processes.
  • 0.1 ni: 0.1% of the CPU is being used by "nice" (low priority) processes.
  • 88.9 id: 88.9% of the CPU is idle.
  • 1.7 wa: 1.7% of the CPU is waiting for I/O
Now, what do 0.0 hi, 0.0 si, and 0.0 st mean?
Old 08-28-2013, 09:22 PM   #2
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From the 'top' man page:

recent kernel versions are shown first.
us, user : time running un-niced user processes
sy, system : time running kernel processes
ni, nice : time running niced user processes
wa, IO-wait : time waiting for I/O completion
hi : time spent servicing hardware interrupts
si : time spent servicing software interrupts
st : time stolen from this vm by the hypervisor
1 members found this post helpful.
Old 08-28-2013, 09:48 PM   #3
Registered: May 2012
Location: San Luis, Argentina
Distribution: Debian
Posts: 204

Original Poster
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Originally Posted by kbp View Post
From the 'top' man page:
You are absolutely correct. I don't know why I didn't check the man page first before posting.
Thank you for pointing me in the right direction, though.


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