CPU use is excessive

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Here is an improved script, you can run it manually:

#!/bin/bash
#v. 0.0.0
#cpu minimal limit to log
cpuLimit=50;
#log files
cpuLog="/var/log/cpu-log.log";
cpuLimitLog="/var/log/cpu-limit-log.log";
while true; 
###cpuUsage=$(top -bn2 | grep '%Cpu' | tail -1 | grep -P '(....|...) id,'|awk '{print 100-$8}');
cpuUsage=$( cat <(grep 'cpu ' /proc/stat) <(sleep 1 && grep 'cpu ' /proc/stat) | awk -v RS="" '{print ($13-$2+$15-$4)*100/($13-$2+$15-$4+$16-$5)}' );
#comment this next line out if you don't need to log all resource limits
do (echo; echo "CPU usage ${cpuUsage%.*}: $(date)" && ps -e -o pcpu,pmem,user,group,vsz,nice,args --sort=-pcpu | head -10 | cut -d" " -f1- ) >> $cpuLog;
#log if cou utilisation is above a limit
if [ ${cpuUsage%.*} -ge $cpuLimit ]
then
#uncomment next just to see if works
#echo ${cpuUsage%.*};
( echo; echo "CPU usage ${cpuUsage%.*}: $(date)" && ps -e -o pcpu,pmem,user,group,vsz,nice,args --sort=-pcpu | head -10 | cut -d" " -f1- ) >> $cpuLimitLog;
fi;
sleep 5; 
done

You can change the cpu limit to log (in your case you want only 100, but I put 50 for testing purposes)

cpuLimit=50;

And now I sorted out to show the processes that really eat up cpu, here is an example of the output (you can change the log file location, I change them to /var/log/cpu-limit-log.log…)

CPU usage 54: Fri Sep  1 06:24:37 EEST 2023
%CPU %MEM USER     GROUP       VSZ  NI COMMAND
21.0  1.9 root     root     123788   0 /usr/share/webmin/authentic-theme/stats.cgi
 5.3 11.4 root     root     1002776  0 /usr/bin/suricata -D --af-packet -c /etc/suricata/suricata.yaml --pidfile /run/suricata.pid
 4.6  0.2 root     root     167756   0 /sbin/init
 1.1  0.7 root     root     1551532  0 /usr/bin/python3 /usr/bin/fail2ban-server -xf start
 0.0  0.0 root     root          0   0 [kthreadd]
 0.0  0.0 root     root          0 -20 [rcu_gp]
 0.0  0.0 root     root          0 -20 [rcu_par_gp]
 0.0  0.0 root     root          0 -20 [slub_flushwq]
 0.0  0.0 root     root          0 -20 [netns]

CPU usage 60: Fri Sep  1 06:25:02 EEST 2023
%CPU %MEM USER     GROUP       VSZ  NI COMMAND
72.0  0.0 root     root       3644   0 gzip -f -9 /var/log/account//pacct.0
 9.6  1.8 root     root     128532   0 /usr/share/webmin/virtual-server/collectinfo.pl
 5.3 11.4 root     root     1002776  0 /usr/bin/suricata -D --af-packet -c /etc/suricata/suricata.yaml --pidfile /run/suricata.pid
 4.6  0.2 root     root     167756   0 /sbin/init
 2.0  1.4 root     root     110656   0 /usr/share/webmin/webmincron/webmincron.pl
 1.1  0.7 root     root     1551532  0 /usr/bin/python3 /usr/bin/fail2ban-server -xf start
 0.0  0.0 root     root          0   0 [kthreadd]
 0.0  0.0 root     root          0 -20 [rcu_gp]
 0.0  0.0 root     root          0 -20 [rcu_par_gp]

CPU usage 50: Fri Sep  1 06:26:30 EEST 2023
%CPU %MEM USER     GROUP       VSZ  NI COMMAND
11.0  0.0 root     root          0   0 [/usr/share/webm] <defunct>
 6.2  1.8 root     root     120216   0 /usr/share/webmin/webmin/refresh_modules.cgi
 5.3 11.4 root     root     1002776  0 /usr/bin/suricata -D --af-packet -c /etc/suricata/suricata.yaml --pidfile /run/suricata.pid
 4.6  0.2 root     root     167756   0 /sbin/init
 1.1  0.7 root     root     1551532  0 /usr/bin/python3 /usr/bin/fail2ban-server -xf start
 0.0  0.0 root     root          0   0 [kthreadd]
 0.0  0.0 root     root          0 -20 [rcu_gp]
 0.0  0.0 root     root          0 -20 [rcu_par_gp]
 0.0  0.0 root     root          0 -20 [slub_flushwq]

Hopefully is more useful than last solution I gave you, for you and for anyone else…
Anyway, sorry for before, was first time coding in bash but that is no excuse.

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