Several decades after its introduction in 1984, top is still one of the most popular tools for looking into system performance. It can help you spotlight processes that are consuming system resources, gauge resource limitations, or get a quick and very useful glimpse into how well your systems are handling their processing loads.
The basic form of the command – what you see when you simply type “top” – shows the most useful performance statistics you’re likely to find on a Unix system. You get a view of how much memory is being used, the system load, the processes that are using the most resources (and who is running those processes), how long the system has been up, and whether any serious swapping is going on.
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The artistry of top
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