vmstat man page on 4.4BSD

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VMSTAT(1)							     VMSTAT(1)

       vmstat - report virtual memory statistics

       vmstat [ -fimst ] [ -c count ] [ -M core ] [ -N system ]
	    [ -w wait ] [ disks ]

       Vmstat  reports	certain	 kernel statistics kept about process, virtual
       memory, disk, trap and cpu activity.

       The options are as follows:

       -c     Repeat the display count times.  The first display  is  for  the
	      time  since  a reboot and each subsequent report is for the time
	      period since the last display.  If no wait  interval  is	speci‐
	      fied, the default is 1 second.

       -f     Report  on  the  number  fork(2) and vfork(2) system calls since
	      system startup, and  the	number	of  pages  of  virtual	memory
	      involved in each.

       -i     Report  on  the  number of interrupts taken by each device since
	      system startup.

       -M     Extract values associated with the name list from the  specified
	      core instead of the default ``/dev/kmem''.

       -N     Extract  the  name list from the specified system instead of the
	      default ``/vmunix''.

       -m     Report on the usage of kernel dynamic  memory  listed  first  by
	      size of allocation and then by type of usage.

       -s     Display the contents of the sum structure, giving the total num‐
	      ber of  several  kinds  of  paging  related  events  which  have
	      occurred since system startup.

       -t     Report  on  the number of page in and page reclaims since system
	      startup, and the amount of time required by each.

       -w     Pause wait seconds between each display.	If no repeat count  is
	      specified, the default is infinity.

       By default, vmstat displays the following information:

       procs  Information about the numbers of processes in various states.

	      r	   in run queue
	      b	   blocked for resources (i/o, paging, etc.)
	      w	   runnable or short sleeper (< 20 secs) but swapped

       memory Information about the usage of virtual and real memory.  Virtual
	      pages (reported in units of 1024 bytes) are considered active if
	      they  belong  to	processes which are running or have run in the
	      last 20 seconds.

	      avm  active virtual pages
	      fre  size of the free list

       page   Information about page faults and paging	activity.   These  are
	      averaged each five seconds, and given in units per second.

	      re   page reclaims (simulating reference bits)
	      at   pages attached (found in free list)
	      pi   pages paged in
	      po   pages paged out
	      fr   pages freed per second
	      de   anticipated short term memory shortfall
	      sr   pages scanned by clock algorithm, per-second

       disks  Disk  operations	per  second  (this field is system dependent).
	      Typically paging will be split across the available drives.  The
	      header  of the field is the first character of the disk name and
	      the unit number.	If more than four disk drives  are  configured
	      in  the  system, vmstat displays only the first four drives.  To
	      force vmstat to display specific drives, their names may be sup‐
	      plied on the command line.

       faults Trap/interrupt rate averages per second over last 5 seconds.

	      in   device interrupts per interval (including clock interrupts)
	      sy   system calls per interval
	      cs   cpu context switch rate (switches/interval)

       cpu    Breakdown of percentage usage of CPU time.

	      us   user time for normal and low priority processes
	      sy   system time
	      id   cpu idle

       The  command  ``vmstat -i 5'' will print what the system is doing every
       five seconds; this is a good choice of printing interval since this  is
       how  often  some	 of  the statistics are sampled in the system.	Others
       vary every second and running the output	 for  a	 while	will  make  it
       apparent which are recomputed every second.

       /vmunix	  default kernel namelist
       /dev/kmem  default memory file

       fstat(1), netstat(1), nfsstat(1), ps(1), systat(1), iostat(8), pstat(8)

       The   sections	starting  with	``Interpreting	system	activity''  in
       Installing and Operating 4.3BSD.

       The -c and -w options are only available with the default output.

4th Berkeley Distribution	 June 6, 1993			     VMSTAT(1)

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