 | | | more on bogged down server | more on bogged down server 2006-04-10 - By Harold Hallikainen
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Last week, I was out of town for the week and, of course, my FC4 system
slowed down to a crawl, and eventually I could not get into it at all. I
just bought and installed a "Web Power Switch" (under $100 at
http://www.digital-loggers.com/lpc.html), so I will always (I hope) be
able to reboot the system from anywhere.
I also reduced the number of clients (I think that was the term) in
httpd.conf from 150 to 50.
Based on Rick's suggestion, I also added this to /etc/sysctl.conf:
# below lines added 4/8/06 to try to prevent system bog downs due to
httpd. hh
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
My web server has a lot of large files that will take a while for people
to download. I suspect Apache is starting another thread for each of
these, and keeping it open a long time. As more and more requests come in,
the load just keeps getting bigger. Here's a recent top:
Cpu(s): 98.3% us, 1.7% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 1027640k total, 1013188k used, 14452k free, 8292k buffers
Swap: 2031608k total, 244252k used, 1787356k free, 224352k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19089 apache 16 0 45120 17m 4780 S 17.0 1.8 0:04.59 httpd
14416 apache 24 0 60736 31m 4904 R 3.7 3.1 13:02.87 httpd
18425 apache 21 0 59872 30m 2996 R 3.7 3.0 2:58.17 httpd
8965 apache 25 0 59724 31m 4800 R 3.3 3.2 30:11.74 httpd
10263 apache 25 0 60896 32m 4664 R 3.3 3.2 17:42.99 httpd
10268 apache 25 0 60620 27m 4512 R 3.3 2.7 17:12.99 httpd
13121 apache 25 0 59540 31m 4648 R 3.3 3.2 15:00.67 httpd
13585 apache 25 0 51556 12m 4508 R 3.3 1.3 13:09.44 httpd
13802 apache 25 0 51364 19m 4504 R 3.3 1.9 13:28.15 httpd
14613 apache 25 0 60684 18m 4508 R 3.3 1.8 12:32.11 httpd
14682 apache 25 0 51284 10m 2960 R 3.3 1.0 13:36.44 httpd
14852 apache 25 0 51332 16m 4992 R 3.3 1.6 10:08.87 httpd
14853 apache 25 0 51144 18m 4620 R 3.3 1.9 11:20.88 httpd
14935 apache 25 0 51656 18m 5352 R 3.3 1.9 10:52.20 httpd
15134 apache 25 0 51360 18m 5364 R 3.3 1.8 10:00.45 httpd
15138 apache 21 0 51200 17m 5336 R 3.3 1.8 10:33.49 httpd
15504 apache 20 0 60708 20m 4512 R 3.3 2.0 10:24.10 httpd
15876 apache 20 0 51028 10m 4528 R 3.3 1.1 8:41.13 httpd
15877 apache 23 0 60520 20m 5448 R 3.3 2.1 5:43.60 httpd
16331 apache 20 0 60328 32m 5516 R 3.3 3.2 5:19.84 httpd
16633 apache 25 0 60420 32m 5408 R 3.3 3.2 5:15.28 httpd
17859 apache 25 0 60016 32m 5520 R 3.3 3.3 2:27.50 httpd
18089 apache 25 0 60040 32m 5512 R 3.3 3.3 3:17.04 httpd
18426 apache 21 0 59588 32m 5292 R 3.3 3.2 0:36.13 httpd
18503 apache 25 0 59800 32m 5460 R 3.3 3.3 0:57.90 httpd
Notice that a lot of those httpd processes have been running quite a while.
My concern now is that while everything seems to be working, I think I'm
missing some incoming mail. Here's something from /var/log/maillog:
Apr 10 11:46:48 sujan sendmail[2316]: rejecting connections on daemon MTA:
load average: 33
So... what do I do?
THANKS!
Harold
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