[Solved]RAM captured by unseen process

[gaojicainiao]

1.png (282.1 KiB) Viewed 1655 times

2.png (160.97 KiB) Viewed 1655 times

[sturmvogel]

What's the problem? Different tools use different ways to calculate the memory usage. One is the ancient plasma tool (ksysguard) and one is the actual successor (systemmonitor).

Read the description from the column "Memory":

This is an approximation of the real amount of physical memory that this process is using. It is calculated by dividing the process' shared memory usage by the amount of processes sharing that memory, then adding the process' private memory.

[gaojicainiao]

Oh, sorry that I did not explain accurately. I mean there are some processes, they have their own ram usage, but when sum (in picture 1), it does not match (the picture 2).
Every time I boot into desktop, it has only 1 GiB ram usage in gnome system monitor, but now I closed all other application windows, it has so much more ram that I can not seen which process is using it.

[doktor5000]

For one, you are comparing apples to oranges. And for two, you should read up on the explanations what those columns actually mean.
Do you know what shared memory or RSS means related to processes, and how the total memory usage is displayed (and why that is often misunderstood)?

Also, what is your actual problem? What you've shown is just a few screenshots of two system monitors, but no actual underlying problem was presented.

[gaojicainiao]

Linux RAM.png (84.28 KiB) Viewed 1634 times

Found a picture then understood suddenly.
Oh my god. I have something want to complain, but I think I would better not to say, I have no the qualification.

I am sorry for disturbing.

[gaojicainiao]

https://www.linuxatemyram.com/

Please forgive a newbie.

[doktor5000]

That's what I tried to tell you already in your previous thread on this topic: viewtopic.php?f=15&t=14773
But you didn't seem to want to listen.

[gaojicainiao]

That's what I tried to tell you already in your previous thread on this topic: viewtopic.php?f=15&t=14773
But you didn't seem to want to listen.

Sometimes my gnome system monitor says cache (ram) is much more than application used. So I thought the cache does not belong to the sum. But sometimes cache is a part of sum, which make me ask this question. What I need is a word "cache belongs to used ram sum". I thought the "file cache" you said belongs to free ram (in linux's view), so misunderstanding happened.

"Usually every free amount of memory is used by file caching, this is nothing that needs to be fixed." You said.

[doktor5000]

You may want to read something like Mel Gorman's book "Understanding the Linux Virtual Memory Manager": https://www.kernel.org/doc/gorman/