Debian virtual memory reaching limit
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Gregor
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Published on 2012-04-12T09:18:05Z
Indexed on
2012/04/12
11:32 UTC
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Hit count: 272
As a relative newbie to systems, I inherited a Debian server and I've noticed that virtual memory is very high (around 95%!). The server has been running slow for around 6 months, and I was wondering if any of you had any tips on things I could try, particularly on freeing up memory. The server hosts various websites and also a Postit email server.
Here are the details:
Operating system Debian Linux 5.0 Webmin version 1.580 Time on system Thu Apr 12 11:12:21 2012 Kernel and CPU Linux 2.6.18-6-amd64 on x86_64 Processor information Intel(R) Core(TM)2 Duo CPU E7400 @ 2.80GHz, 2 cores System uptime 229 days, 12 hours, 50 minutes Running processes 138 CPU load averages 0.10 (1 min) 0.28 (5 mins) 0.36 (15 mins) CPU usage 14% user, 1% kernel, 0% IO, 85% idle Real memory 2.94 GB total, 1.69 GB used Virtual memory 3.93 GB total, 3.84 GB used Local disk space 142.84 GB total, 116.13 GB used
Free m output:
free -m
total used free shared buffers cached
Mem: 3010 2517 492 0 107 996
-/+ buffers/cache: 1413 1596
Swap: 4024 3930 93
Top output:
top - 11:59:57 up 229 days, 13:38, 1 user, load average: 0.26, 0.24, 0.26
Tasks: 136 total, 2 running, 134 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.8%us, 0.5%sy, 0.0%ni, 95.0%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3082544k total, 2773160k used, 309384k free, 111496k buffers
Swap: 4120632k total, 4024712k used, 95920k free, 1036136k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
28796 www-data 16 0 304m 68m 6188 S 8 2.3 0:03.13 apache2
1 root 15 0 10304 592 564 S 0 0.0 0:00.76 init
2 root RT 0 0 0 0 S 0 0.0 0:04.06 migration/0
3 root 34 19 0 0 0 S 0 0.0 0:05.67 ksoftirqd/0
4 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0
5 root RT 0 0 0 0 S 0 0.0 0:00.06 migration/1
6 root 34 19 0 0 0 S 0 0.0 0:01.26 ksoftirqd/1
7 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/1
8 root 10 -5 0 0 0 S 0 0.0 0:00.12 events/0
9 root 10 -5 0 0 0 S 0 0.0 0:00.00 events/1
10 root 10 -5 0 0 0 S 0 0.0 0:00.00 khelper
11 root 10 -5 0 0 0 S 0 0.0 0:00.02 kthread
16 root 10 -5 0 0 0 S 0 0.0 0:15.51 kblockd/0
17 root 10 -5 0 0 0 S 0 0.0 0:01.32 kblockd/1
18 root 15 -5 0 0 0 S 0 0.0 0:00.00 kacpid
127 root 10 -5 0 0 0 S 0 0.0 0:00.00 khubd
129 root 10 -5 0 0 0 S 0 0.0 0:00.00 kseriod
180 root 10 -5 0 0 0 S 0 0.0 70:09.05 kswapd0
181 root 17 -5 0 0 0 S 0 0.0 0:00.00 aio/0
182 root 17 -5 0 0 0 S 0 0.0 0:00.00 aio/1
780 root 16 -5 0 0 0 S 0 0.0 0:00.00 ata/0
782 root 16 -5 0 0 0 S 0 0.0 0:00.00 ata/1
783 root 16 -5 0 0 0 S 0 0.0 0:00.00 ata_aux
802 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_0
803 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_1
804 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_2
805 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_3
1013 root 10 -5 0 0 0 S 0 0.0 49:27.78 kjournald
1181 root 15 -4 16912 452 448 S 0 0.0 0:00.05 udevd
1544 root 14 -5 0 0 0 S 0 0.0 0:00.00 kpsmoused
1706 root 13 -5 0 0 0 S 0 0.0 0:00.00 kmirrord
1995 root 18 0 193m 3324 1688 S 0 0.1 8:52.77 rsyslogd
2031 root 15 0 48856 732 608 S 0 0.0 0:01.86 sshd
2071 root 25 0 17316 1072 1068 S 0 0.0 0:00.00 mysqld_safe
2108 mysql 15 0 320m 72m 4368 S 0 2.4 1923:25 mysqld
2109 root 18 0 3776 500 496 S 0 0.0 0:00.00 logger
2180 postgres 15 0 99504 3016 2880 S 0 0.1 1:24.15 postgres
2184 postgres 15 0 99504 3596 3420 S 0 0.1 0:02.08 postgres
2185 postgres 15 0 99504 696 628 S 0 0.0 0:00.65 postgres
2186 postgres 15 0 99640 892 648 S 0 0.0 0:01.18 postgres
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