The server system is ubuntu 16.04. Kworker process significantly abnormal. After rebooting it becomes normal, a few days later, kworker process CPU will continue to rise again. The server has 40 cores and 80 threads. As long as the computing task is slightly higher (but not more than 50% of the total utilization), the occupation of the Kwork process will increase accordingly. For example, here is the current occupancy, each kworker process to account for 15% to 20% of the CPU.
17759 root 20 0 0 0 0 S 22.2 0.0 0:50.88 kworker/30:2 9738 root 20 0 0 0 0 S 21.6 0.0 1:36.46 kworker/22:10 15727 root 20 0 0 0 0 S 20.7 0.0 0:50.71 kworker/35:0 4009 root 20 0 0 0 0 S 20.1 0.0 2:09.24 kworker/71:0 14877 root 20 0 0 0 0 S 20.1 0.0 0:45.04 kworker/23:1 15779 root 20 0 0 0 0 S 20.1 0.0 0:52.27 kworker/37:2 144257 root 20 0 0 0 0 S 20.1 0.0 2:49.50 kworker/69:2 13592 root 20 0 0 0 0 S 19.8 0.0 1:01.53 kworker/24:2 14997 root 20 0 0 0 0 S 19.8 0.0 0:48.79 kworker/76:2 18386 root 20 0 0 0 0 S 19.8 0.0 0:47.26 kworker/34:0 96270 root 20 0 0 0 0 S 19.2 0.0 3:20.43 kworker/73:0 16390 root 20 0 0 0 0 S 18.9 0.0 0:52.08 kworker/32:2 18698 root 20 0 0 0 0 S 18.9 0.0 0:49.32 kworker/14:0 22607 root 20 0 0 0 0 S 18.9 0.0 0:13.00 kworker/77:2 59163 zhangzq 20 0 32.109g 0.020t 0.020t S 18.9 16.2 15:40.76 tdf_dump 89994 root 20 0 0 0 0 S 18.6 0.0 3:54.33 kworker/75:1 5927 root 20 0 0 0 0 S 18.3 0.0 2:10.41 kworker/21:10 17499 root 20 0 0 0 0 S 18.0 0.0 0:49.03 kworker/31:1 87653 root 20 0 0 0 0 S 18.0 0.0 4:18.64 kworker/70:2 17668 root 20 0 0 0 0 S 17.7 0.0 0:50.40 kworker/18:0 20226 root 20 0 0 0 0 S 17.7 0.0 0:34.18 kworker/19:12 145927 root 20 0 0 0 0 S 17.7 0.0 3:06.14 kworker/26:2 18586 root 20 0 0 0 0 S 17.4 0.0 0:45.97 kworker/25:1 21019 root 20 0 0 0 0 S 17.4 0.0 0:19.63 kworker/63:12 15284 root 20 0 0 0 0 S 17.1 0.0 0:45.27 kworker/78:0 18076 root 20 0 0 0 0 S 17.1 0.0 0:49.19 kworker/12:2 18984 root 20 0 0 0 0 S 17.1 0.0 0:47.85 kworker/38:0 138840 root 20 0 0 0 0 S 16.8 0.0 2:29.14 kworker/51:1 18316 root 20 0 0 0 0 S 16.5 0.0 0:48.14 kworker/13:0 18341 root 20 0 0 0 0 S 16.5 0.0 0:51.44 kworker/11:1 19904 root 20 0 0 0 0 S 16.5 0.0 0:33.35 kworker/64:9 19985 root 20 0 0 0 0 S 16.5 0.0 0:38.51 kworker/33:0 22601 root 20 0 0 0 0 S 16.5 0.0 0:11.88 kworker/27:1 14430 root 20 0 0 0 0 S 16.3 0.0 0:56.02 kworker/36:1 20860 root 20 0 0 0 0 S 16.3 0.0 0:33.18 kworker/17:0 21420 root 20 0 0 0 0 S 16.3 0.0 0:22.05 kworker/15:17 17148 root 20 0 0 0 0 S 16.0 0.0 0:47.60 kworker/59:0 21443 root 20 0 0 0 0 S 16.0 0.0 0:19.03 kworker/29:2 66158 root 20 0 0 0 0 S 16.0 0.0 4:20.64 kworker/61:0 98647 root 20 0 0 0 0 S 16.0 0.0 3:23.56 kworker/66:0 111881 root 20 0 0 0 0 S 16.0 0.0 3:03.42 kworker/45:0 136391 root 20 0 0 0 0 S 16.0 0.0 2:41.38 kworker/72:2 447 root 20 0 0 0 0 S 15.7 0.0 1:05.69 kworker/20:5 146310 root 20 0 0 0 0 S 15.7 0.0 2:43.91 kworker/5:2 147091 root 20 0 0 0 0 S 15.7 0.0 2:56.16 kworker/60:9 3543 root 20 0 0 0 0 S 15.4 0.0 2:23.02 kworker/62:0 12254 root 20 0 0 0 0 S 15.4 0.0 1:01.56 kworker/79:0 16571 root 20 0 0 0 0 S 15.4 0.0 0:46.58 kworker/56:0 22211 root 20 0 0 0 0 S 15.1 0.0 0:18.21 kworker/50:10 17190 root 20 0 0 0 0 S 14.8 0.0 0:45.99 kworker/52:1 18794 root 20 0 0 0 0 S 14.8 0.0 0:46.80 kworker/39:0 112976 root 20 0 0 0 0 S 14.8 0.0 3:10.59 kworker/68:1
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