CLI Magic: Use top to monitor PCs across a network
Most Linux users are familiar with the top command, typically used to examine the system load on a local PC and others on the network. However, have you considered using top to monitor your system automatically and to warn you when a server is being overloaded?
In order to identify an overloaded server you must first find out what the system load is. Look at the right side of top's output, where it says something like this:
top - 17:59:26 up 9:44, 2 users, load average: 1.05, 0.36, 0.02
This information tells you the load average for the last one, five, and 15 minutes. What exactly does load average mean? Here's a great definition I learned years ago when I first started working with Unix:
The load average represents the number of computers you would need to be able to run all of the processes at the same time.
All you have to do is extract the load-average fields and use them to identify an overloaded server. You can't do this in normal top mode because the default is to display to the screen continually, refreshing itself every few seconds. However, you can use the -n flag to limit the number of iterations:
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