After the computer is opened for a while, at some point it gets extremely slow. It's not that it freezes, because if you move the mouse you can see that after 10-20 seconds moves a bit. I also tried to enter the terminal using Ctrl + Alt + F1 but the same happens. To write a single letter takes minutes. I tried to execute top or ps aux for example but it takes forever.
Command output execution just after startup machine:
swapon --show
$ swapon --show
NAME TYPE SIZE USED PRIO
/dev/sda6 partition 976M 0B -2
top
Tasks: 212 total, 1 running, 148 sleeping, 0 stopped, 0 zombie
%Cpu(s): 6,8 us, 3,4 sy, 0,0 ni, 89,1 id, 0,5 wa, 0,0 hi, 0,1 si, 0,0 st
KiB Mem : 3952020 total, 2405260 free, 625092 used, 921668 buff/cache
KiB Swap: 999420 total, 999420 free, 0 used. 2707928 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2372 joel 20 0 675348 36620 29032 S 6,2 0,9 0:01.13 gnome-terminal-
1 root 20 0 185692 6136 3948 S 0,0 0,2 0:01.78 systemd
2 root 20 0 0 0 0 S 0,0 0,0 0:00.00 kthreadd
3 root 20 0 0 0 0 I 0,0 0,0 0:00.00 kworker/0:0
4 root 0 -20 0 0 0 I 0,0 0,0 0:00.00 kworker/0:0H
5 root 20 0 0 0 0 I 0,0 0,0 0:00.06 kworker/u8:0
6 root 0 -20 0 0 0 I 0,0 0,0 0:00.00 mm_percpu_wq
7 root 20 0 0 0 0 S 0,0 0,0 0:00.02 ksoftirqd/0
8 root 20 0 0 0 0 I 0,0 0,0 0:00.15 rcu_sched
9 root 20 0 0 0 0 I 0,0 0,0 0:00.00 rcu_bh
10 root rt 0 0 0 0 S 0,0 0,0 0:00.00 migration/0
11 root rt 0 0 0 0 S 0,0 0,0 0:00.00 watchdog/0
12 root 20 0 0 0 0 S 0,0 0,0 0:00.00 cpuhp/0
13 root 20 0 0 0 0 S 0,0 0,0 0:00.00 cpuhp/1
14 root rt 0 0 0 0 S 0,0 0,0 0:00.00 watchdog/1
15 root rt 0 0 0 0 S 0,0 0,0 0:00.00 migration/1
16 root 20 0 0 0 0 S 0,0 0,0 0:00.02 ksoftirqd/1
17 root 20 0 0 0 0 I 0,0 0,0 0:00.00 kworker/1:0
18 root 0 -20 0 0 0 I 0,0 0,0 0:00.00 kworker/1:0H
19 root 20 0 0 0 0 S 0,0 0,0 0:00.00 cpuhp/2
20 root rt 0 0 0 0 S 0,0 0,0 0:00.00 watchdog/2
21 root rt 0 0 0 0 S 0,0 0,0 0:00.00 migration/2
22 root 20 0 0 0 0 S 0,0 0,0 0:00.01 ksoftirqd/2
23 root 20 0 0 0 0 I 0,0 0,0 0:00.00 kworker/2:0
24 root 0 -20 0 0 0 I 0,0 0,0 0:00.00 kworker/2:0H
25 root 20 0 0 0 0 S 0,0 0,0 0:00.00 cpuhp/3
26 root rt 0 0 0 0 S 0,0 0,0 0:00.00 watchdog/3
27 root rt 0 0 0 0 S 0,0 0,0 0:00.00 migration/3
28 root 20 0 0 0 0 S 0,0 0,0 0:00.00 ksoftirqd/3
29 root 20 0 0 0 0 I 0,0 0,0 0:00.02 kworker/3:0
Command output execution when the machine is slow:
swapon --show
$ swapon --show
NAME TYPE SIZE USED PRIO
/dev/sda6 partition 976M 976M -2
topI could not manage to get a proper text output but I can tell that the processkswapd2was consuming from 80% to 100% CPU.
Observations with htop
I keept monitoring my computer untill it became super slow and found out that it starts to get very slow when it runs out of swap. Due to big amount of firefox windows and the VirtualBox running a Ubuntu 18.04 server a lot of ram is used.
I managed to kill VirtualBox from the terminal opened with Alt+Shift+F2 and the system became usable again, although the swap usage didn't went down any more from 950M aprox.
