vmstat is a UNIX command that displays information about processes, memory, CPU activity and more, which helps to check memory leaks and bottlenecks for performance issues. Several switches can be added to the command when run:

vmstat -n {delay} {count}
vmstat -V

-n - displays header only once instead of repeating
-v - displays version information
delay - delay between updates (in seconds)
count - the number of updates; defaults to infinity

vmstat does not count as a running process.

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