На хосте 64 ГБ.
free -m
# free -m
total used free shared buff/cache available
Mem: 64103 53953 2898 3 7251 9487
Swap: 975 76 899
# smem -mkt | tail -20
/usr/lib/locale/locale-archive 14 38.0K 534.0K
/usr/sbin/sshd 3 217.0K 651.0K
/bin/zsh5 1 668.0K 668.0K
/usr/lib/x86_64-linux-gnu/libglib-2.0.so 4 189.0K 756.0K
/lib/systemd/systemd-networkd 1 796.0K 796.0K
/usr/lib/x86_64-linux-gnu/libgio-2.0.so. 3 288.0K 866.0K
[stack] 36 30.0K 1.1M
/bin/bash 4 294.0K 1.2M
/lib/systemd/systemd 3 405.0K 1.2M
/usr/bin/python3.6 1 1.3M 1.3M
/lib/x86_64-linux-gnu/libm-2.27.so 14 119.0K 1.6M
/lib/systemd/libsystemd-shared-237.so 8 221.0K 1.7M
/usr/lib/x86_64-linux-gnu/libcrypto.so.1 3 617.0K 1.8M
/usr/bin/python2.7 1 2.1M 2.1M
/lib/x86_64-linux-gnu/libc-2.27.so 36 72.0K 2.6M
/var/log/journal/1eedc77d25e740febd7d970 1 9.4M 9.4M
<anonymous> 36 297.0K 10.5M
[heap] 36 588.0K 20.7M
-----------------------------------------------------------------
150 1028 23.6M 71.9M
# top -o %MEM
top - 21:56:10 up 160 days, 7:44, 3 users, load average: 0.00, 0.02, 9.87
Tasks: 631 total, 1 running, 320 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 65641888 total, 2969808 free, 55245976 used, 7426104 buff/cache
KiB Swap: 999420 total, 921468 free, 77952 used. 9716952 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
50262 root 19 -1 135652 15968 15368 S 0.0 0.0 0:00.03 systemd-journal
60293 root 0 -20 19752 7304 4320 S 0.0 0.0 0:00.42 atop
9044 root 20 0 107984 7216 6208 S 0.0 0.0 0:00.02 sshd
1 root 20 0 78460 7108 4744 S 0.0 0.0 483:36.65 systemd
1572 root 20 0 171996 6736 3900 S 0.0 0.0 157:34.26 networkd-dispat
11575 hyl 20 0 45044 5528 3876 S 0.0 0.0 0:00.18 zsh
12393 root 20 0 22832 5336 3572 S 0.0 0.0 0:23.60 bash
1821 root 10 -10 25880 5264 4036 S 0.0 0.0 0:00.00 iscsid
50122 root 20 0 22704 5092 3436 S 0.0 0.0 0:00.03 bash
50132 root 20 0 22704 5084 3424 S 0.0 0.0 0:00.15 bash
1520 root 20 0 287524 4972 4388 S 0.0 0.0 15:06.03 accounts-daemon
50188 root 20 0 22704 4944 3316 S 0.0 0.0 0:00.03 bash
12043 hyl 20 0 77440 4876 3608 S 0.0 0.0 66:24.17 systemd
50402 root 20 0 44724 4728 3432 R 1.0 0.0 0:00.27 top
12391 root 20 0 63516 4256 3748 S 0.0 0.0 0:00.00 sudo
50121 root 20 0 32776 4208 2500 S 0.0 0.0 0:00.61 screen
1680 root 20 0 288892 4036 3672 S 0.0 0.0 0:00.10 polkitd
1510 syslog 20 0 263036 3816 2320 S 0.0 0.0 46:03.77 rsyslogd
1476 root 20 0 70904 3812 3276 S 0.0 0.0 37:18.55 systemd-logind
1094 root 20 0 47272 3764 2924 S 0.0 0.0 730:37.69 systemd-udevd
1344 systemd+ 20 0 145964 3588 2944 S 0.0 0.0 132:58.92 systemd-network
11518 hyl 20 0 107984 3384 2376 S 0.0 0.0 0:00.86 sshd
1424 systemd+ 20 0 70860 3368 3128 S 0.0 0.0 362:05.19 systemd-resolve
1490 message+ 20 0 50176 3296 2812 S 0.0 0.0 112:44.69 dbus-daemon
1422 systemd+ 20 0 141912 3140 2920 S 0.0 0.0 19:19.70 systemd-timesyn
50120 root 20 0 31428 2996 2732 S 0.0 0.0 0:00.00 screen
1817 root 20 0 72296 2860 2796 S 0.0 0.0 0:00.02 sshd
1552 root 20 0 31320 2592 2304 S 0.0 0.0 9:31.88 cron
1483 root 20 0 110736 2364 1988 S 0.0 0.0 607:01.31 irqbalance
1469 daemon 20 0 28332 1956 1828 S 0.0 0.0 0:00.14 atd
1819 root 20 0 25376 1800 1624 S 0.0 0.0 4:40.07 iscsid
1976 root 20 0 16180 1540 1408 S 0.0 0.0 0:00.05 agetty
1529 root 20 0 456952 1472 1356 S 0.0 0.0 1:08.84 lxcfs
1082 root 20 0 105904 1016 904 S 0.0 0.0 0:00.00 lvmetad
В упор не вижу, кто сожрал. Вроде буферы и кеш небольшие. Можете помочь, кто съел память?