Print report on virtual memory statistics, including information on processes, memory, swap space, I/O, system and CPU usage. vmstat will first report average values since the last system reboot. If given a sampling period interval in seconds, it will print additional statistics for each interval. If specified, vmstat will exit when it has completed count reports. Otherwise, it will continue until it receives a Ctrl-C, printing a new header line each time it fills the screen.
Don’t print new header lines when the screen is full.
Print version number, then exit.
Processes waiting for run time.
Uninterruptable sleeping processes.
Swapped but runnable processes.
Virtual memory used, in kilobytes.
Idle memory, in kilobytes.
Memory used as buffers, in kilobytes.
Memory swapped in from disk each second, in kilobytes.
Memory swapped out to disk each second, in kilobytes.
Blocks sent to block devices each second.
Blocks received from block devices each second.
Interrupts per second, including clock interrupts.
Context switches per second.
Percentage of CPU time consumed by user processes.
Percentage of CPU time consumed by system processes.
Percentage of CPU time spent idle.