[arm-allstar] systemd very high CPU usage

[Patrick Perdue]

Greetings:

Others have posted about this before, but what is the possible reason 
for a node having such high CPU usage after a few days uptime? It seems 
like mostly processes related to systemd and crond are at fault. I can 
of course reboot the node, but I'd love to know what's actually going on 
here, as this happens with relative consistency. I do have a couple of 
tasks that periodically restart a service (Analog_Bridge) and other 
related things in my cron. This is on a Raspberry Pi 400. 5.4.75-1-ARCH.


[root at radioless ~]# top
top - 05:53:24 up 19 days, 11:40,  1 user,  load average: 10.22, 9.82, 9.67
Tasks: 154 total,   1 running,  90 sleeping,   0 stopped,   0 zombie
%Cpu0  :   0.0/2.8 3[||| ]
%Cpu1  :   0.0/5.0 5[||||| ]
%Cpu2  :   0.7/2.1 3[||| ]
%Cpu3  :   1.4/2.7 4[|||| ]
GiB Mem : 13.4/3.748 [ ]
GiB Swap:  0.0/0.000 [ ]

   PID USER      PR  NI    VIRT    RES  %CPU %MEM     TIME+ S COMMAND
     1 root      20   0   29.7m   4.3m   0.0  0.1  14:13.01 S systemd
   173 root      20   0   27.8m  22.9m   0.0  0.6   3:56.86 S  `- 
systemd-journal
   201 root      20   0   12.0m   3.0m   0.0  0.1   0:02.60 S  `- 
systemd-udevd
   266 systemd+  20   0   12.3m   1.8m   0.0  0.0   0:03.06 S  `- 
systemd-timesyn
   270 root      20   0    3.1m   2.0m   0.0  0.1   0:02.80 S  `- crond
   272 root      20   0    3.1m   2.3m   0.0  0.1   0:34.17 S  `- 
systemd-logind
   274 dbus      20   0    5.5m   2.8m   0.0  0.1   1:35.67 S  `- 
dbus-daemon
   282 systemd+  20   0   11.4m   1.9m   0.0  0.0   0:03.50 S  `- 
systemd-network
   283 root      20   0    7.6m   4.3m   0.0  0.1  13:49.41 S  `- haveged
   284 root      20   0   57.8m  38.9m   2.0  1.0 477:51.04 S  `- 
MMDVM_Bridge
   292 root      20   0    1.8m   0.0m   0.0  0.0   0:00.00 S  `- md380-emu
   296 root      20   0    2.0m   1.3m   0.0  0.0   0:00.01 S  `- agetty
   298 root      20   0   29.3m  13.8m   0.0  0.4   1:00.79 S  `- httpd
12226 http      20   0   29.3m   6.1m   0.0  0.2   0:00.00 S `- httpd
12227 http      20   0   29.3m   6.1m   0.0  0.2   0:00.01 S `- httpd
12228 http      20   0   29.3m   6.1m   0.0  0.2   0:00.00 S `- httpd
12229 http      20   0   29.3m   6.1m   0.0  0.2   0:00.00 S `- httpd
12230 http      20   0   29.3m   6.1m   0.0  0.2   0:00.00 S `- httpd
  2640 http      20   0   29.3m   6.1m   0.0  0.2   0:00.00 S `- httpd
   299 root      20   0    6.6m   4.1m   0.0  0.1   0:00.07 S  `- sshd
[root at radioless ~]#