Closing Invalid (actually a Won't Fix though - see above comment)
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1193073
Title:
cpu usage does not match sum of per-process usage
Status in “linux” package in Ubuntu:
Invalid
Bug description:
Ubuntu 12.04. Already tested with kernel 3.10 as well.
Steps:
1 Get on a system with 2 cpus, netperf and top installed (need m1.medium)
2. Stop already running netserver
3. sudo taskset -c 0 netserver
4. taskset -c 1 netperf -H localhost -l 3600 -t TCP_RR & (start netperf with
priority on cpu1)
5. Run top, press 1 for multiple CPUs to be separated
6. Observe how the numbers don't add up (varies between being off by 3-7% or
so) between the process's numbers and the CPU%
The numbers also do not add up correctly when viewed directly from /proc
Bonus. Run htop to see a completely different set of seemingly wrong results.
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