Hello, Would you please provide some direction on how to go about determining what is using CPU when no applications are open except System Monitor?
I noticed that the CPU was jumping between 13% and 20% with no apps. open and tried looking at processes and tried looking using Htop but that was equllay challenging for me. I shutdown/rebooted twice with no change.
Anyway, I stumbled across the part of System Monitor that shows usage by core. I have an HP Elitedesk with 8 cores and noticed that core 2 shows 100% constantly.
How can I figure out what that means, such as is core 2 being used or damaged?
I’m pretty sure that CPU usage is usually very low on my machine (as I use it, anyway) because sometimes I watch it when doing what, for me, are complicated data reads, manipulation, and writes to SQLite databases that last for a couple hours and CPU usage remains at about 15% throughout.
Thank you for any guidance you may be able to provide.
I think I figured it out. I have a LAMP stack on the machine but haven’t used it in several months. It appears that for some reason, HTTPD and MariaDB were started again at startup and were using 100% of Core 2. After trying systemctl stop mariadb and systemctl stop httpd, Core 2 went to 0%; and total CPU jumps around from 0.5 to 4% again.
When looking at the CPU usage by process, neither of these showed a value for CPU usage though. Why, when a core is at 100%, does the process list not show a value?
I started httpd and mariadb, again, to see what would happen and Core 5 goes to 100%; but when I look in System Montior by process and see them listed, the CPU value for both is blank.