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I got an issue with one of our webserver. Yesterday, I noticed that the website is very slow, and so, I login to the webserver to check. issuing, 'top' command showing me 100% utilization on CPU, but ram/memory looks fine. I issue htop and seeing also 100% utilization, so I checked the logs, /var/log/apache2/*.log and I found out that two of the URL (linked - not enire site) comes in a very high rate. (see sample below)

120.28.78.99 - - [16/Jul/2012:10:52:48 +0800] "GET /?p=8150 HTTP/1.1" 503 485 "certain_url_of_my_site" "Mozilla/5.0 (Windows; U; e-US) AppleWebKit/533.19.4 (KHTML, like Gecko) AdobeAIR/3.1"
122.54.143.122 - - [16/Jul/2012:10:53:39 +0800] "GET /?p=8150 HTTP/1.1" 301 431 "certain_url_of_my_site" "Mozilla/5.0 (Windows; U;en-US) AppleWebKit/533.19.4 (KHTML, like Gecko) AdobeAIR/3.1"
112.211.211.179 - - [16/Jul/2012:10:53:48 +0800] "GET /?p=8150 HTTP/1.1" 301 431 "certain_url_of_my_site" "Mozilla/5.0 (Windows; U en-US) AppleWebKit/533.19.4 (KHTML, like Gecko) AdobeAIR/3.1"
180.191.74.37 - - [16/Jul/2012:10:53:48 +0800] "GET /?p=8150 HTTP/1.1" 301 431 "certain_url_of_my_site" "Mozilla/5.0 (Windows; U; n-US) AppleWebKit/533.19.4 (KHTML, like Gecko) AdobeAIR/3.1"
121.96.138.137 - - [16/Jul/2012:10:53:47 +0800] "GET /?p=8150 HTTP/1.1" 301 431 "certain_url_of_my_site" "Mozilla/5.0 (Windows; U;en-US) AppleWebKit/533.19.4 (KHTML, like Gecko) AdobeAIR/3.1"
49.145.76.158 - - [16/Jul/2012:10:53:50 +0800] "GET /?p=8150 HTTP/1.1" 301 431 "certain_url_of_my_site" "Mozilla/5.0 (Windows; U; n-US) AppleWebKit/533.19.4 (KHTML, like Gecko) AdobeAIR/3.1"

certain_url_of_my_site = is the linked or url of my site which comes in high rate. Even I tail -f the log, the scroll is so fast that I could read the log.

I checked all the configuration of the server and seems to be fine, and this just suddenly happened.

Server Info: DELL R210 / 4GB Ubuntu 10.04 LTS Apache2/ PHP5/ mYSQL/ Wordpress

The site is running on wordpress.

Hope somebody can help me fix the issue.

Thanks.

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