As the title asks, the reason I'm asking is because I have a wordpress site which gets about 10K visitors per day on a dedicated server from iweb but in the evenings, around 8 to midnight the site crawls to a halt and page load time goes up to about 12 seconds or more compared to 2-3 during the day. Checking my google analytics its shows that traffic is pretty dispersed throughout the day so its not the case where the server is being hammered during those hours by visitors. The two server specs are:
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OS: Linux CentOS
CPU: Intel Core 2 Duo - 2.13 GHz
RAM: 2 GB
Storage: 2 x 300 GB hard drives
Bandwidth: 1,000 GB per month
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Core 2 Duo 2.4GHz (800MHz FSB)
4GB RAM
500GB SATA2
Enterprise Linux - CentOS - 64 bits
cPanel/WHM Internal
There's nothing weird in the logs for apache except Internal server error which happens a few times during those hours but not during the day and results in httpd and mysqld consuming 100% cpu for long periods of time. Load average on the server is usually about 15,15.x,15.x during those hours then in the day its 0.x,0.x,0.x