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This may be something that belongs on ServerFault, but I’m not completely certain.
I’m trying to diagnose performance problems on a WordPress install that consistently runs at around 88% CPU load, with 3-8 PHP processes running at any one time (sometimes a few of which are marked as <DEFUNCT>.)
I already have APC installed, WP Super Cache/WP Widget Cache installed.
Is there a way to determine exactly where the bottlenecks are coming from, ideally with a script name or similar?
You may look at the profiling with the XDebug extension: http://xdebug.org/docs/profiler