dave selby wrote:
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 ?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 ?
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