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Comparing two servers - both Dell 2650's:
S1: 2x2.8Ghz CPU's - Debian Sarge with exim 4.31 and 2.4.24 kernel
S2: 2x3.2Ghz CPU's - Debian Woody with backports on exim (4.32),
Spamassassin (2.63), shorewall (1.4.8) and 2.4.26 kernel
S1 is receiving mail from outside, scan it for spam and deliver it to
two other mail servers inside the firewall.
S2 recveive mail from both outside and inside, delivers to a worldwide
and inside the campus, do spam- and virusscanning (uvscan).
The configuration for exim is different but for spamassassin it is
practically identical.
As you can see from the statistics below there is a problem on S2.
A few questions:
1. Why does S2 use so much resources for the same programs?
2. Why does S1 have only two or three process running while on S2 it
is up to 70?
3. How do I find out what is causing the high system CPU-usage on S2?
4. Why does S2 swop so much while there is still about 1 Gig of ram
free?
5. It seems that both spamassassin and exim uses much more resources
on S2 while S1 is handling more messages. How do I reconcile that?
Statistics for the past 24 hours:
Emails Received Sent Rejected at smtp-time
S1 26471 28341 22713
S2 18390 19020 20264
On S1 the load average looks like this:
top - 11:35:08 up 18 days, 1:29, 3 users, load average: 1.08, 1.01, 0.95
Tasks: 109 total, 2 running, 107 sleeping, 0 stopped, 0 zombie
Cpu(s): 10.3% user, 3.2% system, 0.0% nice, 86.5% idle
Mem: 3883092k total, 2677560k used, 1205532k free, 160556k buffers
Swap: 2000084k total, 2132k used, 1997952k free, 2220484k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4194 Debian-e 12 0 2992 2984 2632 S 2.3 0.1 0:00.08 exim4
43 root 10 0 0 0 0 S 1.0 0.0 98:41.57 kjournald
628 postgres 9 0 2152 1980 1868 S 0.7 0.1 8:11.41 postmaster
30295 spamd 14 0 33224 32m 31m S 0.7 0.9 0:22.35 spamd
3190 Debian-e 9 0 2796 2788 2600 S 0.7 0.1 0:00.80 exim4
393 root 9 0 612 612 516 S 0.3 0.0 35:32.20 syslogd
4929 Debian-e 9 0 2808 2800 2616 S 0.3 0.1 0:00.02 exim4
4987 spamd 10 0 1044 1044 812 R 0.3 0.0 0:00.03 top
5030 root 11 0 2544 2536 2400 S 0.3 0.1 0:00.01 exim4
5032 root 13 0 2544 2536 2400 S 0.3 0.1 0:00.01 exim4
5037 root 14 0 2544 2536 2396 S 0.3 0.1 0:00.01 exim4
5041 spamd 15 0 33496 32m 30m R 0.3 0.9 0:00.01 spamd
While on S2:
11:21:08 up 1 day, 20:02, 4 users, load average: 75.05, 72.27, 62.04
364 processes: 281 sleeping, 71 running, 12 zombie, 0 stopped
CPU states: 0.5% user, 98.2% system, 1.3% nice, 0.1% idle
Mem: 3881872K total, 3773048K used, 108824K free, 8500K buffers
Swap: 2097136K total, 2097136K used, 0K free, 84160K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
7362 Debian-e 20 0 9112 9104 1736 R 8.7 0.2 0:17 uvscan
7926 Debian-e 20 0 2144 1980 1876 R 8.6 0.0 0:04 exim4
7551 Debian-e 20 0 5260 5256 956 R 8.5 0.1 0:13 uvscan
32747 Debian-e 20 0 2536 2284 2104 R 8.3 0.0 0:32 exim4
21882 Debian-e 20 0 2504 2108 2096 R 8.2 0.0 0:51 exim4
7341 root 17 0 500 500 384 R 8.2 0.0 0:16 grep
1197 Debian-e 20 0 2092 1784 1760 R 8.1 0.0 2:23 exim4
4588 Debian-e 20 0 2496 2096 2044 R 8.1 0.0 0:50 exim4
8086 Debian-e 14 0 1960 1956 956 R 7.9 0.0 0:00 uvscan
7708 Debian-e 20 0 5652 5648 1012 R 7.8 0.1 0:07 uvscan
8010 Debian-e 20 0 2112 1924 1860 R 7.7 0.0 0:02 exim4
7602 Debian-e 20 0 2332 2196 2020 R 7.5 0.0 0:09 exim4
8037 Debian-e 20 0 2132 1980 1868 R 7.5 0.0 0:04 exim4
8084 Debian-e 19 0 2092 1788 1768 R 7.5 0.0 0:01 exim4
2179 Debian-e 20 0 2496 2104 2052 R 7.4 0.0 0:40 exim4
7771 Debian-e 20 0 2416 2412 956 R 7.4 0.0 0:07 uvscan
8013 Debian-e 20 0 2680 2544 2216 R 7.4 0.0 0:04 exim4
7607 Debian-e 20 0 5376 5372 956 R 7.3 0.1 0:12 uvscan
4495 Debian-e 20 0 2544 2408 2260 R 7.1 0.0 0:23 exim4
7723 Debian-e 20 0 5656 5652 1012 R 7.1 0.1 0:07 uvscan
vmstat on S2 shows:
11:41:20 js@maties6:/usr/local/src$ vmstat 5
procs memory swap io system
cpu
r b w swpd free buff cache si so bi bo in cs us sy
id
51 1 2 2097136 108820 10144 65608 3 6 7 39 34 7 52 4
45
35 2 0 2097132 131100 10420 65416 361 10 1030 514 564 562 23 77
0
32 1 1 2097136 118696 10896 73756 756 23 2840 1071 1170 1089 41 59
0
36 0 1 2097136 115260 11380 90124 1766 245 5650 1525 1963 1834 76 24
0
69 1 1 2097136 108644 11344 91468 98 272 388 506 415 259 10 90
0
80 1 2 2097136 108896 11376 91408 6 35 10 62 216 91 2 98
0
I hope some of you can help me to solve his one.
Regards
Johann
--
Johann Spies Telefoon: 021-808 4036
Informasietegnologie, Universiteit van Stellenbosch
"Thy word have I hid in mine heart, that I might not
sin against thee." Psalm 119:11
[demime 1.01d removed an attachment of type application/pgp-signature which had a name of signature.asc]
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