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Puzzled by the sar command output

In the System Monitoring section, the command sudo sar 3 3 is run; the resulting report shows the system is idle twice for 100% of the time.
How can that be? Surely if a system is not doing anything it must be hung or stopped and if it's in either of these states, how can it run again 3 seconds later?
I've run the command many times and have failed to duplicate this!

Comments

  • Posts: 916

    There is nothing wrong with the output. It is just rounding up to 100 percent I guess--the system was really really idle. For example on a system I am running right now (RHEL 8):

    1. c8:/home/coop>sudo sar 3 3
    2. Linux 5.16.0 (c8) 01/15/2022 _x86_64_ (8 CPU)
    3.  
    4. 09:08:30 AM CPU %user %nice %system %iowait %steal %idle
    5. 09:08:33 AM all 0.21 0.00 0.13 0.00 0.00 99.67
    6. 09:08:36 AM all 0.25 0.00 0.04 0.00 0.00 99.71
    7. 09:08:39 AM all 0.17 0.00 0.08 0.04 0.00 99.71
    8. Average: all 0.21 0.00 0.08 0.01 0.00 99.69

    Pretty close to 100 percent, which I agree is a little unexpected but not wrong.

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