I am a developer for two sites. On both of these servers I am having problems with the exact same symptoms:
At various times throughout the week, the cpu load will suddenly start shooting up exponentially until apache is unable to serve pages. This clears up when apache is restarted. Neither server is having an issue with not enough RAM/too much swap being used.
dedicated server with 2GB ram
~410k http requests per day
not using multisite
w3 total cache (using memcached)
Rackspace cloud server instance with 4GB of ram
Database is on another instance also with 4GB of ram
uses multisite (5 blogs via subdomain)
~560k http requests per day
~5000 visits per day
WP Super Cache
Both sites have wp 3.0.1 installed. One of them is a new site (built in 3.0.1). The other was running 2.7 for over a year just fine, and this problem didn’t start happening until immediately after I upgraded to 3.0.1 in September. Neither have any plugins in common. Any ideas where I should look to see where the problem might be coming from?
I have been pulling my hair out over this for almost two months, and am hoping for some insight.
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