[root@abc ~]# man sar
-q Report queue length and load averages. The following values are displayed:
runq-sz
Run queue length (number of tasks waiting for run time).
plist-sz
Number of tasks in the task list.
ldavg-1
System load average for the last minute. The load average is calculated as the average number of runnable or running tasks (R state), and the number of tasks in unin-
terruptible sleep (D state) over the specified interval.
ldavg-5
System load average for the past 5 minutes.
ldavg-15
System load average for the past 15 minutes.
[root@abc ~]# sar -q 1 10
Linux 2.6.32-642.el6.x86_64 (abc) 06/06/2018 _x86_64_ (4 CPU)
11:39:51 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15
11:39:52 AM 0 291 0.12 0.09 0.06
11:39:53 AM 0 291 0.11 0.09 0.06
11:39:54 AM 0 291 0.11 0.09 0.06
11:39:55 AM 0 291 0.11 0.09 0.06
11:39:56 AM 0 291 0.11 0.09 0.06
11:39:57 AM 0 291 0.11 0.09 0.06
11:39:58 AM 0 291 0.10 0.09 0.06
11:39:59 AM 0 291 0.10 0.09 0.06
11:40:00 AM 1 291 0.10 0.09 0.06
11:40:01 AM 0 291 0.10 0.09 0.06
Average: 0 291 0.11 0.09 0.06
[root@abc ~]#
typically a system's load should remain at 70% of the number of cores or lower.
If the system's load is consistently above this amount there may be performance degradation,
and if the load ever rises above the number of cores there will be a significant slowdown.
