Public bug reported: Affects: 2:3.3.12-3ubuntu1.2 (bionic) & 2:3.3.10-4ubuntu2.4 (xenial)
If I run 'top -b -n 1' the CPU percentages are the same every single time. If I run with more iterations the CPU percentages of subsequent iterations update in real time. If I run top interactively then the CPU percentages correctly update in real time. Here's an example. 1) With n=1 the same CPU percentages are always displayed. while true ; do top -b -n 1 | grep -E "^%Cpu" ; sleep 10; done %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st 2) With n=2 the second iteration shows a changing CPU percentage, but the first is still clearly wrong. while true ; do top -b -n 2 | grep -E "^%Cpu" ; sleep 10; done %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 27.3 us, 1.7 sy, 0.0 ni, 70.5 id, 0.0 wa, 0.0 hi, 0.4 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 50.9 us, 5.4 sy, 0.0 ni, 42.2 id, 0.1 wa, 0.0 hi, 1.4 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 63.3 us, 5.2 sy, 0.0 ni, 29.2 id, 0.1 wa, 0.0 hi, 2.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 43.3 us, 2.9 sy, 0.0 ni, 52.4 id, 0.1 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 38.0 us, 3.7 sy, 0.0 ni, 56.8 id, 0.2 wa, 0.0 hi, 1.4 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 47.9 us, 3.5 sy, 0.0 ni, 47.2 id, 0.1 wa, 0.0 hi, 1.2 si, 0.0 st This affects both Xenial and Bionic. ** Affects: procps (Ubuntu) Importance: Undecided Status: New ** Tags: batch procps top -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to procps in Ubuntu. https://bugs.launchpad.net/bugs/1846844 Title: Procps: top -b does not display the correct CPU percentages Status in procps package in Ubuntu: New Bug description: Affects: 2:3.3.12-3ubuntu1.2 (bionic) & 2:3.3.10-4ubuntu2.4 (xenial) If I run 'top -b -n 1' the CPU percentages are the same every single time. If I run with more iterations the CPU percentages of subsequent iterations update in real time. If I run top interactively then the CPU percentages correctly update in real time. Here's an example. 1) With n=1 the same CPU percentages are always displayed. while true ; do top -b -n 1 | grep -E "^%Cpu" ; sleep 10; done %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st 2) With n=2 the second iteration shows a changing CPU percentage, but the first is still clearly wrong. while true ; do top -b -n 2 | grep -E "^%Cpu" ; sleep 10; done %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 27.3 us, 1.7 sy, 0.0 ni, 70.5 id, 0.0 wa, 0.0 hi, 0.4 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 50.9 us, 5.4 sy, 0.0 ni, 42.2 id, 0.1 wa, 0.0 hi, 1.4 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 63.3 us, 5.2 sy, 0.0 ni, 29.2 id, 0.1 wa, 0.0 hi, 2.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 43.3 us, 2.9 sy, 0.0 ni, 52.4 id, 0.1 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 38.0 us, 3.7 sy, 0.0 ni, 56.8 id, 0.2 wa, 0.0 hi, 1.4 si, 0.0 st %Cpu(s): 46.1 us, 4.1 sy, 0.2 ni, 48.1 id, 0.2 wa, 0.0 hi, 1.2 si, 0.0 st %Cpu(s): 47.9 us, 3.5 sy, 0.0 ni, 47.2 id, 0.1 wa, 0.0 hi, 1.2 si, 0.0 st This affects both Xenial and Bionic. 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