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 ?
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