I have Apache running about 5 vhosts, few of which really get much in
the way of hits. If I run top, I see a lot of <defunct> httpd processes,
and each one is listed as using 1-5% of the CPU. They usually show up
and disappear in a cycle. Here is a sample:
top - 08:32:31 up 416 days, 8:14, 2 users, load average: 2.40, 2.36, 2.17
Tasks: 107 total, 5 running, 90 sleeping, 0 stopped, 12 zombie
Cpu(s): 56.3% us, 21.5% sy, 0.0% ni, 22.2% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 1027556k total, 1010636k used, 16920k free, 304016k buffers
Swap: 2040244k total, 31368k used, 2008876k free, 379012k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6223 www 16 0 0 0 0 Z 2.3 0.0 0:00.07 httpd
<defunct>
6254 www 25 0 0 0 0 Z 2.3 0.0 0:00.07 httpd
<defunct>
6256 www 17 0 0 0 0 Z 2.3 0.0 0:00.07 httpd
<defunct>
6253 www 25 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6255 www 25 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6257 www 19 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6258 www 17 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6259 www 16 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6260 www 21 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6261 www 18 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6262 www 22 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
6263 www 23 0 0 0 0 Z 2.0 0.0 0:00.06 httpd
<defunct>
18714 root 25 0 51196 28m 6628 R 1.0 2.8 400:42.72 httpd
The part that bothers me is that top shows over 50% cpu use, yet this
server is basically idle, and according to top itself, no other
processes other than httpd are up to much. The loadavg is pretty much
always at or above 1.9.
If I continually ls -l my log files directory, they are not growing, so
I assume the server isn't actually serving anything in that time.
Some more info:
Server version: Apache/2.0.52
Server built: Jul 14 2007 11:53:18
<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 256
MaxClients 256
MaxRequestsPerChild 4000
</IfModule>
<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>
I appreciate any help. To be honest, I didn't look very hard on the
internet before posting this. My apologies if it has been covered
hundreds of times already.
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