Hi all,
I realized that I do not really know how memory works. I recently found
my mail server was very slow and when I looked at the memory usage with
htop, I noticed that NetBSD was swapping. I though that ~4 GB of memory
was sufficient for programs that I considered light: Postfix, Dovecot,
OpenSSH, NGINX (only for proxy). I think the fatest program is Rspamd.
When I boot the VM, the memory usage is correct: 218M. I do not know
what the SIZE column is. The manual of top says it is the total size of
the process. I am surprised that an instance of sshd is about 80 MB. I
see the RES column seems more consistent with what I could expect: 4368
KB for sshd seems correct. My question is probably naive, but what is
the difference? What could sshd do with 76 MB of memory?
load averages: 0.23, 0.12, 0.05; up 0+00:03:39
09:34:55
61 processes: 59 sleeping, 2 on CPU
CPU states: 0.1% user, 0.0% nice, 0.4% system, 0.1% interrupt, 99.4%
idle
Memory: 218M Act, 112K Wired, 25M Exec, 111M File, 3661M Free
Swap: 8192M Total, 8192M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU
COMMAND
881 rspamd 85 0 162M 15M kqueue/0 0:00 0.00% 0.00%
rspamd-2.1
652 rspamd 85 0 161M 11M kqueue/0 0:00 0.00% 0.00%
rspamd-2.1
670 rspamd 85 0 161M 10M kqueue/0 0:00 0.00% 0.00%
rspamd-2.1
758 root 85 0 160M 7168K kqueue/1 0:00 0.00% 0.00%
rspamd-2.1
1037 root 85 0 116M 8908K nanosl/1 0:03 0.00% 0.00% perl
104 rrdcache 43 0 116M 2840K parked/0 0:00 0.00% 0.00%
rrdcached
75 postfix 85 0 80M 7940K kqueue/0 0:00 0.00% 0.00% smtpd
66 root 85 0 80M 5856K select/1 0:00 0.00% 0.00% sshd
1198 triaxx 85 0 80M 4368K select/0 0:00 0.00% 0.00% sshd
1108 triaxx 85 0 80M 4384K select/0 0:00 0.00% 0.00% sshd
370 root 85 0 80M 5848K select/0 0:00 0.00% 0.00% sshd
1260 triaxx 85 0 80M 4360K select/1 0:00 0.00% 0.00% sshd
1021 root 85 0 80M 5852K select/1 0:00 0.00% 0.00% sshd
130 postfix 85 0 79M 8008K lockf/0 0:00 0.00% 0.00% smtpd
354 postfix 85 0 79M 8020K lockf/0 0:00 0.00% 0.00% smtpd
73 postfix 85 0 79M 7972K kqueue/1 0:00 0.00% 0.00% smtpd
1095 postfix 85 0 79M 7952K lockf/0 0:00 0.00% 0.00% smtpd
1023 postfix 85 0 79M 6544K kqueue/0 0:00 0.00% 0.00%
tlsmgr
1111 root 85 0 75M 4136K kqueue/1 0:00 0.00% 0.00%
master
581 postfix 85 0 75M 6188K kqueue/1 0:00 0.00% 0.00% qmgr
989 postfix 85 0 75M 6212K kqueue/0 0:00 0.00% 0.00% anvil
853 postfix 85 0 75M 6196K kqueue/1 0:00 0.00% 0.00%
proxymap
After some days (~7), I get a more problematic memory usage. I see that
rspamd took a little weight, but it is not alarming. However, I have now
2647 MB of active memory and 2328 of them are for files. I would be very
grateful of any advice that could help me to understand what is the
issue and which program consumes so much memory.
load averages: 0.04, 0.07, 0.07; up 7+05:18:48
09:29:51
68 processes: 66 sleeping, 2 on CPU
CPU states: 0.6% user, 0.0% nice, 1.0% system, 0.0% interrupt, 98.4%
idle
Memory: 2647M Act, 1308K Inact, 132K Wired, 115M Exec, 2328M File, 818M
Free
Swap: 8192M Total, 8192M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU
COMMAND
891 rspamd 85 0 255M 120M kqueue/0 0:21 0.05% 0.05%
rspamd-1.9.4
824 rspamd 85 0 163M 13M kqueue/1 0:26 0.00% 0.00%
rspamd-1.9.4
719 rspamd 85 0 163M 15M kqueue/0 ??? 0.00% 0.00%
rspamd-1.9.4
697 root 85 0 161M 7680K kqueue/1 0:01 0.00% 0.00%
rspamd-1.9.4
870 rrdcache 43 0 118M 2852K parked/0 ??? 0.00% 0.00%
rrdcached
169 root 85 0 116M 9172K nanosl/0 ??? 0.00% 0.00% perl
1108 triaxx 85 0 83M 4324K select/0 ??? 0.00% 0.00% sshd
74 root 85 0 82M 5788K select/0 0:00 0.00% 0.00% sshd
137 triaxx 85 0 81M 4336K select/0 ??? 0.00% 0.00% sshd
418 root 85 0 80M 5796K select/1 0:00 0.00% 0.00% sshd
21804 triaxx 85 0 80M 4388K select/0 0:01 0.00% 0.00% sshd
15853 root 85 0 80M 5892K select/1 0:00 0.00% 0.00% sshd
773 triaxx 85 0 80M 4396K select/0 2:26 0.00% 0.00% sshd
1060 root 85 0 80M 5804K select/0 0:00 0.00% 0.00% sshd
24791 postfix 85 0 79M 8408K lockf/0 0:00 0.00% 0.00% smtpd
29154 postfix 85 0 79M 8376K select/0 ??? 0.00% 0.00% smtpd
28912 postfix 85 0 79M 8328K kqueue/1 ??? 0.00% 0.00% smtpd
21134 postfix 85 0 79M 8312K lockf/0 ??? 0.00% 0.00% smtpd
7654 postfix 85 0 79M 8100K select/0 ??? 0.00% 0.00% smtpd
12732 postfix 85 0 79M 8092K kqueue/0 ??? 0.00% 0.00% smtpd
27146 postfix 85 0 79M 8328K select/0 ??? 0.00% 0.00% smtpd
1085 postfix 85 0 79M 6584K kqueue/1 0:01 0.00% 0.00%
tlsmgr
