From: "Jon Schutz" <[EMAIL PROTECTED]>
If benchmark testing isn't showing the fault, it's likely that it is
data-dependent, i.e. it depends on something in the request or response
- something that the benchmark doesn't trigger.
Perhaps clients are left lingering - an incorrect Content-Length could
cause that. I've also seen apache get stuck in busy wait states when
proxying through to a remote site that is not responding correctly.
Your top output is very likely an indication that some requests are not
being served to completion.
I've tried to put ab to run more concurent connections in order to check how
occupied will be the processor, and with:
ab -n 1000 -t 1000 -c 35 [URL]
the processor was occupied sometimes 4 to 9% and sometimes 49 to 80%. Now is
weekend, and there are very very few visitors on my site, and I can assume
that my requests were the only requests, so no other strange requests target
my server.
You could try (as root)
netstat -nap | grep http
I've tried and the latests results are below the message, but I can't
interpret them. I am not a very good Linux user unfortunately.
to see what network connections the httpd processes are holding open.
lsof may also tell you something useful.
I have also ran that command and grepped the results that contain "http" and
from all the results ~ 5000, aproximately 4000 contain "http".
Try attaching an strace to one of the busy httpds to see what system
calls it is doing.
The difficulty with the mod_perl environment is that your httpd
processes are polluted with everything else that is happening on your
server - PHP etc - so what perl is responsible for is obscured. Testing
in a fastcgi environment is better in this respect since perl and apache
are separated. If you are able to try fastcgi, it might reveal some
further insights.
I have never used FastCGI so for the moment I am not able to try it right
now.
Here is the result of netstat -nap | grep http
tcp 0 0 :::80 :::*
LISTEN 4069/httpd
tcp 0 0 :::443 :::*
LISTEN 4069/httpd
tcp 0 5823 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2930
FIN_WAIT1 4554/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2941
FIN_WAIT2 4502/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2943
FIN_WAIT2 4498/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2942
FIN_WAIT2 4475/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2936
FIN_WAIT2 4501/httpd
tcp 0 8743 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2939
FIN_WAIT1 4506/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2920
FIN_WAIT2 4555/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2893
FIN_WAIT2 4488/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2892
FIN_WAIT2 4553/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2949
FIN_WAIT2 4522/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2948
FIN_WAIT2 4531/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2951
FIN_WAIT2 4527/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2950
FIN_WAIT2 4528/httpd
tcp 0 8743 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2945
FIN_WAIT1 4532/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2944
FIN_WAIT2 4545/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2947
FIN_WAIT2 4534/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2946
FIN_WAIT2 4480/httpd
tcp 0 0 ::ffff:81.196.156.249:80 ::ffff:81.180.162.194:2952
FIN_WAIT2 4558/httpd
unix 3 [ ] STREAM CONNECTED 19581118 4558/httpd
unix 3 [ ] STREAM CONNECTED 19581114 4554/httpd
unix 3 [ ] STREAM CONNECTED 19581055 4555/httpd
unix 3 [ ] STREAM CONNECTED 19581035 4553/httpd
unix 3 [ ] STREAM CONNECTED 19580355 4545/httpd
unix 3 [ ] STREAM CONNECTED 19579178 4534/httpd
unix 3 [ ] STREAM CONNECTED 19579165 4532/httpd
unix 3 [ ] STREAM CONNECTED 19579161 4531/httpd
unix 3 [ ] STREAM CONNECTED 19578452 4528/httpd
unix 3 [ ] STREAM CONNECTED 19578450 4527/httpd
unix 3 [ ] STREAM CONNECTED 19577652 4522/httpd
unix 3 [ ] STREAM CONNECTED 19577325 4506/httpd
unix 3 [ ] STREAM CONNECTED 19577269 4502/httpd
unix 3 [ ] STREAM CONNECTED 19577265 4501/httpd
unix 3 [ ] STREAM CONNECTED 19577203 4498/httpd
unix 3 [ ] STREAM CONNECTED 19577086 4488/httpd
unix 3 [ ] STREAM CONNECTED 19577025 4480/httpd
unix 3 [ ] STREAM CONNECTED 19577009 4475/httpd
Thank you.
Octavian
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