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Check which applications are affecting CPU usage in Linux

ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10

or you can try

ps -eo pcpu,pid,user,args | sort -r -k1 | less

Referenced from article: http://www.cyberciti.biz/tips/how-do-i-find-out-linux-cpu-utilization.html

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