The vmstat command can be used to report virtual memory statistics of the system, including CPU utilization, memory usage, and virtual memory swapping status, etc.
$
Example
vmstat: Display virtual memory usage since system startup.
vmstat 5: Display virtual memory usage every 5 seconds.
vmstat -a: Display active and inactive memory usage.
vmstat -f: Display the number of free pages.
vmstat -m: Display memory usage.
vmstat -n 5: Display virtual memory usage every 5 seconds, waiting 5 seconds between displays.