Background services using too much ram

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what is background services?
how can i stop it from using too much ram (sometimes reaches 1.5 GB). i cant manually kill it from system monitor.
im using fedora kde.

From the 3-dot menu of the Applications panel (just to the right of “Configure Columns”), check the “Show Details Sidebar” box.

Then click on the “Background Services” Item and you’ll see a breakdown of memory usage per service.

This is what I see right now on my system:

They are services that provide features to your system that must be running all the time to do that.

Are you sure that 1.5G is not a good use of the memory to provide useful services?

I almost always use command line tools to investigate performance issues.
You can get some insight into service memory usage with this command:

systemd-cgtop -b1

since the total sum of the memory i can see is around 1.2 gb.
but the used memory is 2.7 gb.
i figured that the system is using that difference. (is this wrong?).
and i thought that background services is just something unnecessary.

Have a look at the output of free -h which will list the kernel buffers and caches. The kernel will free up the caches if there is a better use for the memory. The caches speed up, for example, disk accesses.

image
sorry but can you explain the output and how its usefull

Please paste text output as preformatted text not screen shots.

You can find the documentation for free using the command man free.
The man page explains what each value means.