How is runq-sz counted in sar?

I would like to ask question about the output from sar -q . I appreciate if someone can help me out with understanding runq-sz. I have a system which cpu threads are 8 cpu threads on RHEL 7.2 . [ywatanabe@host2 ~]$ cat /proc/cpuinfo | grep processor | wc -l 8 Below is sar -q result from my system but runq-sz seems to be **low** compared to ldavg-1 . runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 blocked 05:10:01 PM 0 361 0.29 1.68 2.14 0 05:11:01 PM 0 363 1.18 1.61 2.08 2 05:12:01 PM 0 363 7.03 3.15 2.58 1 05:13:01 PM 0 365 8.12 4.15 2.96 1 05:14:01 PM 3 371 7.40 4.64 3.20 1 05:15:01 PM 2 370 7.57 5.26 3.51 1 05:16:01 PM 0 366 8.42 5.90 3.84 1 05:17:01 PM 0 365 8.78 6.45 4.16 1 05:18:01 PM 0 363 7.05 6.40 4.28 2 05:19:02 PM 1 364 8.05 6.74 4.53 0 05:20:01 PM 0 367 7.96 6.96 4.74 1 05:21:01 PM 0 367 7.86 7.11 4.93 1 05:22:01 PM 1 366 7.84 7.31 5.14 0 From the man sar , I was thinking that runq-sz represents the number of tasks inside the run queue which states are TASK_RUNNING which corresponds to R sate in ps . runq-sz Run queue length (number of tasks waiting for run time). What does runq-sz actually represent ?