httpd-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From André Warnier ...@ice-sa.com>
Subject Re: [users@httpd] apache 5 x load, 15 x CPU load - whats happening ?
Date Tue, 11 Nov 2008 21:30:37 GMT
dave selby wrote:
> Hi All,
> 
> I have apache2 running AOK serving a web page that calls a xmlhttp
> request every second and downloads a jpeg image approx 28k every
> second. top reveals ...
> 
> 3.3% CPU and 0.8% Memory
> 
> 16089 dave      20   0  241m  85m  29m R  7.3  6.8   6:32.20 firefox-2-bin
> 31187 www-data  20   0 24956  10m 3152 S  3.3  0.8   0:13.96 apache2
> 31350 dave      20   0 36208 4356 1964 S  1.3  0.3   0:25.88 motion
>  5820 root      20   0  326m  64m 6324 S  1.0  5.1   4:19.26 Xorg
>  3546 dave      20   0  2308 1144  852 R  0.7  0.1   0:00.02 top
>  5506 root      15  -5     0    0    0 S  0.7  0.0   0:10.90 kondemand/0
>  5731 messageb  20   0  2824 1220  792 S  0.7  0.1   0:08.30 dbus-daemon
> 
> At certain times the web page calls the same xmlhttp request 5 times a
> second and downloads a jpeg of approx 28k five time a second. I
> expected CPU to be about
> 15 - 20%. Top reveals ...
> 
> 31184 www-data  20   0 24972  10m 3156 R 24.6  0.8   0:14.84 apache2
> 31186 www-data  20   0 24952  10m 3156 S 24.6  0.8   0:15.02 apache2
> 16089 dave      20   0  241m  85m  29m S 20.6  6.8   6:28.24 firefox-2-bin
> 31350 dave      20   0 36208 4356 1964 S  7.0  0.3   0:25.24 motion
>  5820 root      20   0  326m  64m 6324 S  4.3  5.1   4:18.46 Xorg
> 15027 dave      20   0  2308 1144  852 R  0.7  0.1   0:17.18 top
> 
> I now have 2 x apache processes each pulling 24.6% ie 50% of the CPU !
> 
> This is causing real problems. Has anyone any ideas as to why the load
> has increases exponentially ?
> Can anyone give me a pointer as to where to look to solve this ?
> 
I am not the specialist here, but just looking at your two top displays 
above, am I right in suspecting that you are running this XmlHttpRequest 
test from a firefox browser which runs on the same machine as the Apache 
you are testing ? if that is the case, it would be competing for 
resources (of which you do not tell us much) with Apache, and that may 
skew your results quite a bit.  Can you run Firefox on another machine, 
accessing the same server, and check the results then ?
Maybe also tell us which machine this is, and how much memory it really 
has ?

---------------------------------------------------------------------
The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:http://httpd.apache.org/userslist.html> for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
   "   from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org


Mime
View raw message