From day 1 our production Virtualmin Server has been showing our 64 Gig memory to be using only around 8 percent with only 5 customers including self.
Without any new customers or changes I have done to the system, this week the REAL MEMORY graphic is showing we are using 51 percent today.. yesterday it was smaller a little bit, around 39 percent!!!
What is going on here?
What can be done about this issue that is disturbing ???
Status:
Closed (works as designed)
Comments
Submitted by andreychek on Wed, 07/08/2020 - 09:02 Comment #1
Howdy -- thanks for contacting us!
It's normal for Linux to try to use available memory for caching and similar, so that may not indicate a problem of any sort.
However, the key is to review the running processes, and see if there's anything out of the ordinary. What is the output of these commands:
uptimefree -m
ps auxw
uptime
10:59:04 up 7 days, 5:23, 1 user, load average: 0.09, 0.07, 0.12
free -m
Mem: 64250 1801 19450 3250 42998 58717 Swap: 32255 0 32255
ps auxw
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 191428 4444 ? Ss Jul01 3:50 /usr/lib/syste$ root 2 0.0 0.0 0 0 ? S Jul01 0:00 [kthreadd] root 4 0.0 0.0 0 0 ? S< Jul01 0:00 [kworker/0:0H] root 6 0.0 0.0 0 0 ? S Jul01 0:03 [ksoftirqd/0] root 7 0.0 0.0 0 0 ? S Jul01 0:00 [migration/0] root 8 0.0 0.0 0 0 ? S Jul01 0:00 [rcu_bh] root 9 0.3 0.0 0 0 ? S Jul01 36:00 [rcu_sched] root 10 0.0 0.0 0 0 ? S< Jul01 0:00 [lru-add-drain] root 11 0.0 0.0 0 0 ? S Jul01 0:01 [watchdog/0] root 12 0.0 0.0 0 0 ? S Jul01 0:01 [watchdog/1] root 13 0.0 0.0 0 0 ? S Jul01 0:00 [migration/1] root 14 0.0 0.0 0 0 ? S Jul01 0:02 [ksoftirqd/1] root 16 0.0 0.0 0 0 ? S< Jul01 0:00 [kworker/1:0H] root 18 0.0 0.0 0 0 ? S Jul01 0:01 [watchdog/2] root 19 0.0 0.0 0 0 ? S Jul01 0:00 [migration/2] root 20 0.0 0.0 0 0 ? S Jul01 0:04 [ksoftirqd/2]
Submitted by andreychek on Wed, 07/08/2020 - 10:15 Comment #3
Yeah I'm not seeing anything unusual there, that "free" output is only showing about 2GB being used for processes (which is actually particularly low), the rest is being used for caching.
That's just Linux trying to be efficient with the spare memory that's not being used at the moment.
So your server is looking good! Those numbers are all safe to ignore.