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More interruptions than cpu context switches

I have a machine running Debian GNU/Linux 5.0.8 (lenny) 8 cores and 12Gb of RAM. We have one core permanently around 40% ~ 60% wait time and trying to spot what is happening I realized that we have ...
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Finding context switches count and run queue wait time for a process

I am observing (based on logs) that my (java) process pauses for something during execution. My first guess is a context switch. In order to verify I am trying to find (a) the number of involuntary ...