How many ways are there to get CPU idle-time percentages (my examples not all from the same system, in case anyone cares)
top -n1 | grep ^Cpu > Cpu(s): 3.0%us, 0.5%sy, 96.2%ni, 0.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st iostat|grep -A1 avg-cpu > avg-cpu: %user %nice %system %iowait %steal %idle > 3.12 96.33 0.32 0.01 0.00 0.22 vmstat 1 3 > procs -----------memory---------- ---swap-- -----io---- --system-- > -----cpu------ > r b swpd free buff cache si so bi bo in cs us sy id wa > st > 0 0 397328 180788 21712 308620 4 6 36 34 116 59 9 5 85 1 > 0 > 0 0 397328 180780 21720 308612 0 0 0 48 1017 178 8 1 91 0 > 0 > 0 0 397328 180780 21720 308620 0 0 0 0 1076 602 8 0 92 0 > 0 (if the sysstat service is running..) sar -P | egrep 'CPU|Average' > 09:50:02 AM CPU %user %nice %system %iowait %steal > %idle > Average: all 8.58 0.01 0.64 0.75 0.00 > 90.02 I'm sure it can be done via ps, but I've sort-of given up on understanding what options control what for ps. :-( Then there are the GUI programs: System Monitor (gnome-system-monitor) subtract: 100% system-usage, I guess gkrellm subtract .. Who's got more? - - - One burning question I have, is how do (each of) these programs determine CPU usage -- I see the proc filesystem has things like /proc/stat, /proc/vmstat, and of course each process has its own set of data. It does seem that different programs have different ways of defining their usage categories. Is there someplace that nicely explains this kind of stuff? Does anyone want to ramble about it here? Or do have to break down and read the docs in /usr/share/doc/kernel-doc-XXXX.Documentation/filesystems/proc.txt? Regards, ..jim -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
