Maxed out Swap

Hi all,

I've got an odd problem with a 2GB linode running Debian 7.5

The server is used as a basic web/mail/mysql/ftp machine hosting a few low traffic websites.

I've noticed that the machine is using 100% Swap in longview and 74% memory whilst similar machines are using 0% Swap and 24% memory.

Can anyone give me some pointers on where to look to find out what is using the memory and causing swap to run at 100%?

Thanks.

6 Replies

I should add that even after a reboot, the swap starts at 60% and climbs back up to 100% within a few hours.

What's the output of ps aux --sort '-rss'

````
[email protected]:/# ps aux --sort '-rss'
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
clamav 3670 0.1 19.3 506132 394164 ? Ssl 12:19 0:09 /usr/sbin/clamd -c /etc/clamav/clamd.conf
web9 3321 0.0 8.4 462640 172352 ? S 12:19 0:00 php-fpm: pool web9
web16 3296 0.0 8.1 459244 167232 ? S 12:19 0:00 php-fpm: pool web16
mysql 4669 0.1 7.9 474676 161932 ? Sl 12:20 0:13 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/my
web18 3277 0.0 7.0 438796 143912 ? S 12:19 0:00 php-fpm: pool web18
web8 3416 0.0 5.6 468240 116172 ? S 12:19 0:06 php-fpm: pool web8
web8 3414 0.0 5.0 448912 102768 ? S 12:19 0:06 php-fpm: pool web8
web9 3305 0.0 4.8 461856 99544 ? S 12:19 0:00 php-fpm: pool web9
web7 3349 0.0 4.1 445300 84572 ? S 12:19 0:04 php-fpm: pool web7
web2 3442 0.0 4.1 440780 84480 ? S 12:19 0:00 php-fpm: pool web2
web7 3354 0.0 3.9 441412 80076 ? S 12:19 0:04 php-fpm: pool web7
amavis 26639 0.0 3.9 240444 79816 ? S 13:45 0:01 /usr/sbin/amavisd-new (ch7-avail)
amavis 23236 0.0 3.8 239976 79156 ? S 13:30 0:01 /usr/sbin/amavisd-new (ch10-avail)
web2 3444 0.0 3.6 459732 73816 ? S 12:19 0:00 php-fpm: pool web2
amavis 23265 0.0 3.5 234104 73108 ? S 13:31 0:00 /usr/sbin/amavisd-new (ch9-avail)
amavis 25446 0.0 3.5 233648 72904 ? S 13:40 0:00 /usr/sbin/amavisd-new (ch9-avail)
root 4841 0.0 3.0 135660 61436 ? Ss 12:20 0:02 /usr/sbin/spamd --create-prefs --max-children 5 --helper-home-dir -d --pidfile=/v
root 4976 0.0 2.7 135660 57108 ? S 12:20 0:00 spamd child
root 4978 0.0 2.7 135660 57108 ? S 12:20 0:00 spamd child
web7 18807 0.0 2.6 444300 55120 ? S 13:13 0:01 php-fpm: pool web7
web3 3393 0.0 2.6 448760 54308 ? S 12:19 0:00 php-fpm: pool web3
web22 3432 0.0 2.5 441740 52768 ? S 12:19 0:01 php-fpm: pool web22
web16 3303 0.0 2.5 443628 52324 ? S 12:19 0:00 php-fpm: pool web16
web11 3245 0.0 2.5 438776 51808 ? S 12:19 0:00 php-fpm: pool web11
amavis 25551 0.0 2.4 223716 49944 ? S 13:42 0:00 /usr/sbin/amavisd-new (ch7-avail)
web22 3434 0.0 2.4 437172 49088 ? S 12:19 0:01 php-fpm: pool web22
web4 3436 0.0 2.2 450060 46304 ? S 12:19 0:00 php-fpm: pool web4
root 4524 0.0 2.1 206144 44900 ? S 12:19 0:05 python -c from pyovpn.sagent.sagententry import openvpnas ; openvpnas() --logfil amavis 3655 0.0 2.1 222428 43284 ? Ss 12:19 0:01 /usr/sbin/amavisd-new (master) root 3709 0.0 1.8 525480 37972 ? Ss 12:19 0:00 /usr/sbin/apache2 -k start web11 3250 0.0 1.7 438724 36628 ? S 12:19 0:00 php-fpm: pool web11 web4 3440 0.0 1.6 439304 34020 ? S 12:19 0:00 php-fpm: pool web4 web19 3402 0.0 1.5 439764 32140 ? S 12:19 0:00 php-fpm: pool web19 5022 4730 0.0 1.5 166684 31904 ? S 12:20 0:02 python -c from pyovpn.cserv.wserventry import start ; start() -no -u openvpnas web21 1092 0.0 1.5 430616 31796 ? S 14:15 0:00 /usr/bin/php-cgi -d openbasedir=/var/www/clients/client22/web21/web:/var/www/cli
web18 3286 0.0 1.5 437516 31232 ? S 12:19 0:00 php-fpm: pool web18
web19 3407 0.0 1.5 438968 30944 ? S 12:19 0:00 php-fpm: pool web19
5003 7229 0.0 1.3 430612 27944 ? Ss 12:24 0:00 /usr/bin/php-cgi -d magicquotesgpc=off -d session.savepath=/usr/local/ispconfi root 3205 0.0 1.1 114480 23456 ? Ss 12:19 0:04 linode-longview root 4729 0.0 1.0 135428 22316 ? S 12:20 0:00 python -c from pyovpn.log.logworker import start ; start() www-data 23285 0.0 1.0 526780 21016 ? S 13:32 0:00 /usr/sbin/apache2 -k start www-data 24442 0.0 1.0 526776 21012 ? S 13:38 0:00 /usr/sbin/apache2 -k start www-data 24415 0.0 1.0 526704 20948 ? S 13:37 0:00 /usr/sbin/apache2 -k start www-data 28961 0.0 1.0 526712 20924 ? S 13:56 0:00 /usr/sbin/apache2 -k start www-data 18790 0.0 1.0 526668 20872 ? S 13:13 0:00 /usr/sbin/apache2 -k start www-data 18799 0.0 1.0 526660 20864 ? S 13:13 0:00 /usr/sbin/apache2 -k start www-data 32121 0.0 1.0 526740 20788 ? S 14:07 0:00 /usr/sbin/apache2 -k start www-data 11678 0.0 0.9 526792 19064 ? S 12:40 0:00 /usr/sbin/apache2 -k start www-data 11709 0.0 0.9 526724 18892 ? S 12:41 0:00 /usr/sbin/apache2 -k start www-data 7134 0.0 0.9 526752 18816 ? S 12:21 0:00 /usr/sbin/apache2 -k start root 4926 0.0 0.7 114824 14920 ? S 12:20 0:02 python -c from pyovpn.sagent.iptworker import start ; start() web5 3423 0.0 0.7 435012 14792 ? S 12:19 0:00 php-fpm: pool web5 root 4899 0.0 0.7 114808 14688 ? S 12:20 0:00 python -c from pyovpn.sagent.iptworker import start6 ; start6() 5003 7231 0.0 0.6 431464 12704 ? S 12:24 0:00 /usr/bin/php-cgi -d magicquotesgpc=off -d session.savepath=/usr/local/ispconfi
list 3948 0.0 0.6 52848 12352 ? S 12:19 0:01 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=OutgoingRunner:0:1 -s
list 3938 0.0 0.5 52852 12184 ? S 12:19 0:00 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=CommandRunner:0:1 -s
list 3945 0.0 0.5 52872 12172 ? S 12:19 0:00 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=NewsRunner:0:1 -s
list 3935 0.0 0.5 52836 12140 ? S 12:19 0:00 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=ArchRunner:0:1 -s
list 3939 0.0 0.5 52812 12128 ? S 12:19 0:00 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=IncomingRunner:0:1 -s
root 3229 0.0 0.5 435628 12112 ? Ss 12:19 0:00 php-fpm: master process (/etc/php5/fpm/php-fpm.conf)
list 3952 0.0 0.5 52896 12108 ? S 12:19 0:00 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=VirginRunner:0:1 -s
list 3954 0.0 0.5 52892 12044 ? S 12:19 0:00 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=RetryRunner:0:1 -s
list 3936 0.0 0.5 52884 11964 ? S 12:19 0:00 /usr/bin/python /var/lib/mailman/bin/qrunner --runner=BounceRunner:0:1 -s
root 4228 0.0 0.5 51600 11100 ? Ss 12:19 0:00 munin-node
root 3957 0.1 0.4 181896 10068 ? Sl 12:19 0:09 /usr/bin/python /usr/bin/fail2ban-server -b -s /var/run/fail2ban/fail2ban.sock
list 3931 0.0 0.4 61412 9876 ? Ss 12:19 0:00 /usr/bin/python /usr/lib/mailman/bin/mailmanctl -s -q start
postfix 26643 0.0 0.4 75184 9536 ? S 13:45 0:00 smtpd -n smtp -t inet -u -c -o stress= -s 2
bind 3116 0.0 0.4 183168 8724 ? Ssl 12:19 0:00 /usr/sbin/named -u bind
www-data 3722 0.0 0.4 172400 8676 ? S 12:19 0:00 /usr/sbin/apache2 -k start
www-data 3719 0.0 0.4 171224 8196 ? S 12:19 0:00 /usr/sbin/fcgi-pm -k start
postfix 808 0.0 0.3 64252 7940 ? S 14:11 0:00 smtpd -n 127.0.0.1:10025 -t inet -u -c -o contentfilter= -o localrecipientmaps postfix 30114 0.0 0.3 68024 7380 ? S 14:00 0:00 trivial-rewrite -n rewrite -t unix -u -c vmail 753 0.0 0.3 39108 6132 ? S 14:10 0:00 dovecot/imap clamav 3999 0.0 0.2 69392 6080 ? Ss 12:19 0:04 /usr/bin/freshclam -d --quiet --config-file=/etc/clamav/freshclam.conf postfix 30113 0.0 0.2 67832 6040 ? S 14:00 0:00 proxymap -t unix -u vmail 32203 0.0 0.2 39112 5816 ? S 14:09 0:00 dovecot/imap vmail 32197 0.0 0.2 38456 5552 ? S 14:09 0:00 dovecot/imap postfix 5241 0.0 0.2 42484 5500 ? S 12:20 0:00 tlsmgr -l -t unix -u -c root 1924 0.0 0.2 71388 5448 ? Ss 14:15 0:00 sshd: pengimo [priv] vmail 32195 0.0 0.2 38520 5376 ? S 14:09 0:00 dovecot/imap pengimo 1944 0.2 0.2 21320 5284 pts/0 Ss 14:16 0:00 -bash vmail 9547 0.0 0.2 49560 5232 ? S 12:34 0:00 dovecot/imap vmail 25559 0.0 0.2 38292 5200 ? S 13:42 0:00 dovecot/imap vmail 773 0.0 0.2 38380 5092 ? S 14:11 0:00 dovecot/imap root 3717 0.0 0.2 20660 5016 ? S 12:19 0:00 vlogger (access log) postfix 5127 0.0 0.2 59572 4980 ? S 12:20 0:00 qmgr -l -t fifo -u vmail 1923 0.0 0.2 37956 4976 ? S 14:15 0:00 dovecot/imap web16 12976 0.0 0.2 434900 4936 ? S 12:49 0:00 php-fpm: pool web16 vmail 32193 0.0 0.2 37948 4924 ? S 14:09 0:00 dovecot/imap vmail 27744 0.0 0.2 37956 4904 ? S 13:50 0:00 dovecot/imap vmail 26762 0.0 0.2 37920 4880 ? S 13:49 0:00 dovecot/imap vmail 775 0.0 0.2 37936 4876 ? S 14:11 0:00 dovecot/imap web19 6309 0.0 0.2 434900 4876 ? S 12:20 0:00 php-fpm: pool web19 vmail 32201 0.0 0.2 37948 4868 ? S 14:09 0:00 dovecot/imap vmail 26715 0.0 0.2 37984 4856 ? S 13:47 0:00 dovecot/imap vmail 26764 0.0 0.2 37936 4836 ? S 13:49 0:00 dovecot/imap www-data 3257 0.0 0.2 434880 4816 ? S 12:19 0:00 php-fpm: pool www www-data 3254 0.0 0.2 434880 4800 ? S 12:19 0:00 php-fpm: pool www web13 3367 0.0 0.2 434900 4780 ? S 12:19 0:00 php-fpm: pool web13 web5 3426 0.0 0.2 434900 4772 ? S 12:19 0:00 php-fpm: pool web5 web1 3333 0.0 0.2 434900 4768 ? S 12:19 0:00 php-fpm: pool web1 web12 3375 0.0 0.2 434900 4764 ? S 12:19 0:00 php-fpm: pool web12 web6 3264 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web6 web6 3271 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web6 web23 3325 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web23 web23 3327 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web23 web1 3342 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web1 web13 3365 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web13 web12 3384 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web12 web3 3399 0.0 0.2 434900 4760 ? S 12:19 0:00 php-fpm: pool web3 vmail 25545 0.0 0.2 37932 4756 ? S 13:42 0:00 dovecot/imap dovenull 27465 0.0 0.2 24264 4736 ? S 13:50 0:00 dovecot/imap-login dovenull 27676 0.0 0.2 24264 4708 ? S 13:50 0:00 dovecot/imap-login vmail 27510 0.0 0.2 37952 4696 ? S 13:50 0:00 dovecot/imap vmail 26677 0.0 0.2 37948 4692 ? S 13:46 0:00 dovecot/imap vmail 25610 0.0 0.2 37948 4680 ? S 13:44 0:00 dovecot/imap vmail 32199 0.0 0.2 37936 4676 ? S 14:09 0:00 dovecot/imap vmail 27941 0.0 0.2 37836 4660 ? S 13:54 0:00 dovecot/imap root 1903 0.0 0.2 45496 4636 ? S 14:15 0:00 dovecot/auth -w vmail 32120 0.0 0.2 37836 4604 ? S 14:07 0:00 dovecot/imap dovenull 32194 0.0 0.2 24272 4588 ? S 14:09 0:00 dovecot/imap-login dovenull 32189 0.0 0.2 24272 4580 ? S 14:09 0:00 dovecot/imap-login dovenull 26676 0.0 0.2 24272 4568 ? S 13:46 0:00 dovecot/imap-login dovenull 26714 0.0 0.2 24272 4560 ? S 13:47 0:00 dovecot/imap-login dovenull 32196 0.0 0.2 24272 4556 ? S 14:09 0:00 dovecot/imap-login dovenull 32200 0.0 0.2 24272 4552 ? S 14:09 0:00 dovecot/imap-login dovenull 774 0.0 0.2 24272 4548 ? S 14:11 0:00 dovecot/imap-login dovenull 26760 0.0 0.2 24272 4544 ? S 13:49 0:00 dovecot/imap-login dovenull 771 0.0 0.2 24272 4528 ? S 14:11 0:00 dovecot/imap-login root 7063 0.0 0.2 108532 4520 ? Sl 12:20 0:01 /usr/bin/monit -c /etc/monit/monitrc dovenull 32117 0.0 0.2 24272 4504 ? S 14:07 0:00 dovecot/imap-login dovenull 25606 0.0 0.2 24272 4476 ? S 13:44 0:00 dovecot/imap-login vmail 8276 0.0 0.2 38464 4452 ? S 12:26 0:00 dovecot/imap vmail 31002 0.0 0.2 37840 4448 ? S 14:02 0:00 dovecot/imap dovenull 26763 0.0 0.2 24272 4440 ? S 13:49 0:00 dovecot/imap-login dovenull 31000 0.0 0.2 24272 4440 ? S 14:02 0:00 dovecot/imap-login dovenull 1922 0.0 0.2 24272 4436 ? S 14:15 0:00 dovecot/imap-login dovenull 27821 0.0 0.2 24272 4428 ? S 13:52 0:00 dovecot/imap-login vmail 9437 0.0 0.2 38208 4424 ? S 12:30 0:00 dovecot/imap vmail 7143 0.0 0.2 38240 4368 ? S 12:21 0:00 dovecot/imap dovenull 8272 0.0 0.2 24272 4320 ? S 12:26 0:00 dovecot/imap-login root 5314 0.0 0.2 45512 4268 ? S 12:20 0:00 dovecot/auth root 4946 0.0 0.2 42724 4212 ? Ss 12:20 0:00 pure-ftpd (SERVER) ntp 6802 0.0 0.2 39084 4164 ? Ss 12:20 0:00 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 104:103 root 4920 0.0 0.1 23504 4040 ? S 12:20 0:00 dovecot/config postfix 30104 0.0 0.1 39956 3992 ? S 14:00 0:00 pickup -l -t fifo -u -c postfix 956 0.0 0.1 39956 3932 ? S 14:15 0:00 showq -t unix -u -c postfix 5311 0.0 0.1 39956 3916 ? S 12:20 0:00 anvil -l -t unix -u -c root 5122 0.0 0.1 37888 3888 ? Ss 12:20 0:00 /usr/lib/postfix/master znc 4961 0.0 0.1 41576 3740 ? Ssl 12:20 0:01 /usr/local/bin/znc -d /var/lib/znc pengimo 1943 0.0 0.1 71388 3684 ? S 14:16 0:00 sshd: [email protected]/0 root 1959 0.0 0.1 19476 3560 pts/0 S 14:16 0:00 bash 5022 4960 0.0 0.1 36104 3284 ? S 12:20 0:00 openvpn-openssl --errors-to-stderr --config stdin 5022 4975 0.0 0.1 36104 3236 ? S 12:20 0:00 openvpn-openssl --errors-to-stderr --config stdin 5022 4993 0.0 0.1 36100 3188 ? S 12:20 0:00 openvpn-openssl --errors-to-stderr --config stdin 5022 5035 0.0 0.1 36100 3152 ? S 12:20 0:00 openvpn-openssl --errors-to-stderr --config stdin root 1957 0.0 0.1 33536 3092 pts/0 S 14:16 0:00 sudo su root 4772 0.0 0.1 49944 2892 ? Ss 12:20 0:00 /usr/sbin/sshd root 1958 0.0 0.1 37164 2644 pts/0 S 14:16 0:00 su root 4153 0.0 0.1 9352 2612 ? S 12:19 0:00 /bin/sh /usr/bin/mysqldsafe
root 3992 0.0 0.1 22312 2536 ? S 12:19 0:00 /usr/lib/gamin/gamserver root 1966 0.0 0.1 16996 2408 pts/0 R+ 14:16 0:00 ps aux --sort -rss nobody 3902 0.0 0.1 67524 2188 ? Sl 12:19 0:00 /usr/bin/memcached -m 64 -p 11211 -u nobody -l 127.0.0.1 root 3832 0.0 0.1 20420 2144 ? Ss 12:19 0:00 /usr/sbin/cron root 4913 0.0 0.1 21532 2076 ? Ss 12:20 0:00 /usr/sbin/dovecot -c /etc/dovecot/dovecot.conf root 2957 0.0 0.0 52804 1992 ? Sl 12:19 0:00 /usr/sbin/rsyslogd -c5 root 4917 0.0 0.0 13188 1896 ? S 12:20 0:00 dovecot/log root 1046 0.0 0.0 21240 1808 ? Ss 12:19 0:00 udevd --daemon dovecot 4916 0.0 0.0 13060 1732 ? S 12:20 0:00 dovecot/anvil statd 2619 0.0 0.0 23356 1724 ? Ss 12:19 0:00 /sbin/rpc.statd root 7109 0.0 0.0 14588 1724 hvc0 Ss+ 12:20 0:00 /sbin/agetty hvc0 root 5089 0.0 0.0 19628 1700 ? S 12:20 0:00 iptables-restore -n root 1902 0.0 0.0 19264 1592 ? S 14:15 0:00 dovecot/ssl-params root 2588 0.0 0.0 18984 1580 ? Ss 12:19 0:00 /sbin/rpcbind -w root 1136 0.0 0.0 21236 1512 ? S 12:19 0:00 udevd --daemon root 1137 0.0 0.0 21236 1472 ? S 12:19 0:00 udevd --daemon root 4670 0.0 0.0 4100 1368 ? S 12:20 0:00 logger -t mysqld -p daemon.error root 3750 0.0 0.0 4108 1344 ? Ss 12:19 0:00 startpar -f -- jailkit root 1 0.0 0.0 10660 1336 ? Ss 12:19 0:00 init [2] 5022 4965 0.0 0.0 35952 640 ? S 12:20 0:00 openvpn-openssl --errors-to-stderr --config stdin 5022 4981 0.0 0.0 35952 640 ? S 12:20 0:00 openvpn-openssl --errors-to-stderr --config stdin 112 3809 0.0 0.0 29816 252 ? Ss 12:19 0:00 /usr/bin/dbus-daemon --system nobody 3749 0.0 0.0 22868 152 ? Ssl 12:19 0:00 /usr/sbin/jksocketd
root 2 0.0 0.0 0 0 ? S 12:19 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S 12:19 0:00 [ksoftirqd/0]
root 4 0.0 0.0 0 0 ? S 12:19 0:00 [kworker/0:0]
root 5 0.0 0.0 0 0 ? S< 12:19 0:00 [kworker/0:0H]
root 6 0.0 0.0 0 0 ? S 12:19 0:00 [kworker/u4:0]
root 7 0.0 0.0 0 0 ? S 12:19 0:02 [rcusched] root 8 0.0 0.0 0 0 ? S 12:19 0:00 [rcubh]
root 9 0.0 0.0 0 0 ? S 12:19 0:00 [migration/0]
root 10 0.0 0.0 0 0 ? S 12:19 0:00 [migration/1]
root 11 0.0 0.0 0 0 ? S 12:19 0:00 [ksoftirqd/1]
root 12 0.0 0.0 0 0 ? S 12:19 0:00 [kworker/1:0]
root 13 0.0 0.0 0 0 ? S< 12:19 0:00 [kworker/1:0H]
root 14 0.0 0.0 0 0 ? S< 12:19 0:00 [khelper]
root 15 0.0 0.0 0 0 ? S 12:19 0:00 [kdevtmpfs]
root 16 0.0 0.0 0 0 ? S< 12:19 0:00 [netns]
root 18 0.0 0.0 0 0 ? S< 12:19 0:00 [perf]
root 24 0.0 0.0 0 0 ? S 12:19 0:00 [xenwatch]
root 25 0.0 0.0 0 0 ? S 12:19 0:00 [xenbus]
root 248 0.0 0.0 0 0 ? S< 12:19 0:00 [writeback]
root 251 0.0 0.0 0 0 ? S< 12:19 0:00 [crypto]
root 252 0.0 0.0 0 0 ? S< 12:19 0:00 [kintegrityd]
root 253 0.0 0.0 0 0 ? S< 12:19 0:00 [bioset]
root 255 0.0 0.0 0 0 ? S< 12:19 0:00 [kblockd]
root 272 0.0 0.0 0 0 ? S< 12:19 0:00 [md]
root 277 0.0 0.0 0 0 ? S 12:19 0:00 [kworker/1:1]
root 363 0.0 0.0 0 0 ? S< 12:19 0:00 [rpciod]
root 364 0.0 0.0 0 0 ? S 12:19 0:00 [kworker/0:1]
root 492 0.0 0.0 0 0 ? S 12:19 0:02 [kswapd0]
root 561 0.0 0.0 0 0 ? S 12:19 0:00 [fsnotifymark] root 569 0.0 0.0 0 0 ? S 12:19 0:00 [ecryptfs-kthrea] root 591 0.0 0.0 0 0 ? S< 12:19 0:00 [nfsiod] root 599 0.0 0.0 0 0 ? S< 12:19 0:00 [cifsiod] root 612 0.0 0.0 0 0 ? S 12:19 0:00 [jfsIO] root 613 0.0 0.0 0 0 ? S 12:19 0:00 [jfsCommit] root 614 0.0 0.0 0 0 ? S 12:19 0:00 [jfsCommit] root 615 0.0 0.0 0 0 ? S 12:19 0:00 [jfsSync] root 620 0.0 0.0 0 0 ? S< 12:19 0:00 [xfsalloc] root 622 0.0 0.0 0 0 ? S< 12:19 0:00 [xfsmrucache] root 624 0.0 0.0 0 0 ? S< 12:19 0:00 [glockworkqueue]
root 625 0.0 0.0 0 0 ? S< 12:19 0:00 [deleteworkqueu] root 631 0.0 0.0 0 0 ? S< 12:19 0:00 [gfsrecovery]
root 722 0.0 0.0 0 0 ? S 12:19 0:00 [khvcd]
root 819 0.0 0.0 0 0 ? S< 12:19 0:00 [bioset]
root 820 0.0 0.0 0 0 ? S< 12:19 0:00 [drbd-reissue]
root 822 0.0 0.0 0 0 ? S< 12:19 0:00 [rbd]
root 850 0.0 0.0 0 0 ? S< 12:19 0:00 [kpsmoused]
root 852 0.0 0.0 0 0 ? S< 12:19 0:00 [raid5wq]
root 856 0.0 0.0 0 0 ? S< 12:19 0:00 [dmbufiocache]
root 880 0.0 0.0 0 0 ? S< 12:19 0:00 [ipv6_addrconf]
root 895 0.0 0.0 0 0 ? S< 12:19 0:00 [ceph-msgr]
root 901 0.0 0.0 0 0 ? S< 12:19 0:00 [bioset]
root 925 0.0 0.0 0 0 ? S< 12:19 0:00 [deferwq]
root 929 0.0 0.0 0 0 ? S< 12:19 0:00 [kworker/0:1H]
root 930 0.0 0.0 0 0 ? S 12:19 0:00 [jbd2/xvda-8]
root 931 0.0 0.0 0 0 ? S< 12:19 0:00 [ext4-rsv-conver]
root 2631 0.0 0.0 25308 0 ? Ss 12:19 0:00 /usr/sbin/rpc.idmapd
daemon 3078 0.0 0.0 16684 0 ? Ss 12:19 0:00 /usr/sbin/atd
root 7133 0.0 0.0 0 0 ? S< 12:21 0:00 [kworker/1:1H]
root 30922 0.0 0.0 0 0 ? S 14:00 0:00 [kworker/u4:1]
[email protected]:/#

````

Ahh!

From that it looks like php-fpm is using lots of resources.

Maybe I should swap the sites over to fast-cgi or mod_php?

Looks like you've quite a lot running on there, clamav is your biggest user with 384MB which isn't unusual it's a memory hog. PHP is your next largest culprit but it's not using an excessive amount. You have multiple PHP-FPM pools which from a security point of view is good since you can isolate sites but from a resource point of view it's bad since each site requires it's own pool.

Changing to mod_php will only make things worse since even static files will require a process that has PHP loaded, fastcgi is fpm's predecessor so no benefit there.

Now you say you're using 100% swap, this might not be a bad thing, how big is the swap? And can you see how much swapping you're doing? Linux will put things into swap that aren't being used very often, which is good since it frees up memory for file caches and other things.

The Swap is 512MB.

I've changed all of the sites to use fast-cgi and it seems that the swap is now sitting at around 20% used with the RAM at around 70%.

I'll keep an eye on this over the next few days and see if it's stable.

Thanks.

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