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Understanding load average
Another very important topic to understand when monitoring performance is 
load 
average
, which is a series of numbers that represents your server's trend in CPU 
utilization over a given time. You've probably already seen these series of numbers 
before, as there are several places in which the load average appears. If you run the 
htop
 utility, for example, the load average is shown on the screen. In addition, if 
you execute the 
uptime
 command, you can see the load average in the output of that 
command as well. You can also view your load average by viewing the text file that 
stores it in the first place:
cat /proc/loadavg

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Monitoring System Resources