Thereare also mpstat (view stats on a per cpu basis) and iostat (to see io activity). You can see where the the system is doing more work by looking at usr/sys/idle/wt. usr is userland stuff, sys is any kernel related activity (semephore, context switching, memory allocation etc) wt is io wait (physical io blocking). and idle is the amount the cpu is sitting "idle". As Abigail pointed out a proccess using 95 or 100% of cpu is not always bad, but you may want to renice it if you have other proccesses on your server that usually use that cpu and are being hit by your perl script running. Also take a moment to verify the size of your proccess loaded into memory. Do you have it build huge arrays/hashtables? are you forcing the machine to swap, and causing slowdown on the other services on the machine?
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