что жрет оперативку

top - 09:30:59 up 20 days, 16:20,  1 user,  load average: 0.00, 0.03, 0.12
KiB Mem:  16256984 total, 15063148 used,  1193836 free,   271316 buffers
KiB Swap:  1048572 total,        0 used,  1048572 free. 12345044 cached Mem
  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 4342 mysql     20   0  757612 289820   9460 S   0.0  1.8 304:34.32 mysqld
  453 root      20   0  153960  78212  75816 S   0.0  0.5   5:58.11 systemd-journal
29112 root      20   0  270688  60948   3252 S   0.0  0.4   0:20.16 /usr/bin/spamd
29118 root      20   0  270688  58388    692 S   0.0  0.4   0:00.17 spamd child
29117 root      20   0  270688  58332    636 S   0.0  0.4   0:00.15 spamd child
  835 named     20   0  688304  50300   3424 S   0.0  0.3   1:08.62 named
  715 root      20   0  791784  44124  41444 S   0.0  0.3   3:29.71 rsyslogd
 5941 nginx     20   0   88212  29772   1140 S   0.3  0.2   0:00.48 nginx
 5934 nginx     20   0   88212  29560   1028 S   0.0  0.2   0:00.13 nginx
 5939 nginx     20   0   88212  29560   1020 S   0.0  0.2   0:00.25 nginx
 5940 nginx     20   0   88212  29560   1024 S   0.0  0.2   0:00.25 nginx
 5935 nginx     20   0   88212  29556   1024 S   0.0  0.2   0:00.18 nginx
 5937 nginx     20   0   88212  29556   1024 S   0.0  0.2   0:00.14 nginx
 5938 nginx     20   0   88212  29552   1020 S   0.0  0.2   0:00.19 nginx
 5936 nginx     20   0   88212  29056    676 S   0.0  0.2   0:00.15 nginx
 7430 root      20   0   81876  25900   1624 S   0.0  0.2   0:01.39 nginx
 5950 apache    20   0 2523428  17236   2792 S   0.0  0.1   0:01.56 httpd
 5949 apache    20   0 2523428  17112   2792 S   0.0  0.1   0:01.59 httpd
19291 root      20   0  266284  16896  12724 S   0.0  0.1   0:12.92 php-fpm55
19310 root      20   0  265424  16544  12624 S   0.0  0.1   0:06.51 php-fpm54
  708 root      20   0  549988  16088   5604 S   0.0  0.1   2:12.57 tuned
 3112 root      20   0  104208  15624   3216 S   0.0  0.1   0:00.03 dhclient
 1004 polkitd   20   0  516300  11260   4560 S   0.0  0.1   1:17.49 polkitd
  845 root      20   0  453920  11112   6972 S   0.0  0.1   4:16.81 NetworkManager
 7417 root      20   0   77856  10264   3376 S   0.0  0.1   0:06.37 httpd
  719 root      20   0  212096   5420   3688 S   0.0  0.0   0:00.05 abrtd
 7387 root      20   0  135516   5268   4072 S   0.0  0.0   0:00.09 sshd
32089 root      20   0   20536   4928   1380 S   0.0  0.0   0:24.76 auth
  721 root      20   0  209648   4424   3120 S   0.0  0.0   0:08.38 abrt-watch-log
    1 root      20   0  197240   4220   2336 S   0.0  0.0   2:54.72 systemd
32063 root      20   0   17308   3888   1132 S   0.0  0.0   0:23.36 config
 1743 root      20   0   82788   3592   2756 S   0.0  0.0   0:34.57 sshd
  387 dovecot   20   0   48236   3332   2576 S   0.0  0.0   0:00.00 imap-login
  403 dovecot   20   0   48236   3332   2576 S   0.0  0.0   0:00.00 imap-login
  405 dovecot   20   0   48236   3332   2576 S   0.0  0.0   0:00.00 imap-login
  421 dovecot   20   0   48236   3332   2576 S   0.0  0.0   0:00.00 imap-login
10120 dovecot   20   0   48236   3332   2576 S   0.0  0.0   0:00.00 imap-login
16471 dovecot   20   0   48232   3332   2572 S   0.0  0.0   0:00.00 pop3-login