On my CentOS 7 systems, I use tuned-adm to set a profile appropriate to the environment during configuration, but after that, I never subsequently change that profile. It seems that the tuned system spawns a process (/usr/bin/python -Es /usr/sbin/tuned -l -P) for dynamic monitoring and adjustment. This process uses noticeably more memory compared to other daemons on my system. I would like to reduce nonessential services on a certain memory-constrained server. If I do not use a profile that involves dynamically adjusting parameters such as power consumption, does the tuned process need to keep running? Can I safely stop the process and have the profile that I originally set up persist from that point on?
Tuned sets the performance optimizations at boot time. If you disable the process and reboot your server, optimizations would be lost.
You can; however, stop the process after boot and keep whatever settings tuned created at boot time. At least, this is what my testing showed.
As of CentOS 7.2
tunednow has a no-daemon mode which can be turned on by settingdaemon = 0in/etc/tuned/tuned-main.conf. This is mentioned in the RedHat Performance Tuning Guide.