# 2.11BSD#431 - /usr/man/cat1/vmstat.0

    VMSTAT(1)	    UNIX Programmer's Manual		VMSTAT(1)

    NAME
         vmstat - report virtual memory statistics

    SYNOPSIS
         vmstat [ -fsi ] [ drives ] [ interval [ count ] ]

    DESCRIPTION
         Vmstat delves into the system and normally reports certain
         statistics kept about process, virtual memory, disk, trap
         and cpu activity.	If given a -f argument, it instead
         reports on the number of forks and vforks since system
         startup and the number of pages of virtual memory involved
         in each kind of fork.  If given a -s argument, it instead
         prints the contents of the sum structure, giving the total
         number of several kinds of paging related events which have
         occurred since boot.  If given a -i argument, it instead
         reports on the number of interrupts taken by each device
         since system startup.

         If none of these options are given, vmstat will report in
         the first line a summary of the virtual memory activity
         since the system has been booted.	If interval is specified,
         then successive lines are summaries over the last interval
         seconds.  ``vmstat 5'' will print what the system is doing
         every five seconds; this is a good choice of printing inter-
         val since this is how often some of the statistics are sam-
         pled in the system; others vary every second, running the
         output for a while will make it apparent which are recom-
         puted every second.  If a count is given, the statistics are
         repeated count times.  The format fields are:

         Procs: information about 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 are considered active if they belong
         to processes which are running or have run in the last 20
         seconds.  A ``page'' here is 1024 bytes.

         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)

    Printed 11/26/99	 March 15, 1986                         1

    VMSTAT(1)	    UNIX Programmer's Manual		VMSTAT(1)

         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

         up/hp/rk/ra: Disk operations per second (this field is sys-
         tem dependent).  Typically paging will be split across
         several of the available drives.  The number under each of
         these is the unit number.

         Faults: trap/interrupt rate averages per second over last 5
         seconds.

         in   (non clock) device interrupts per second
         sy   system calls per second
         cs   cpu context switch rate (switches/sec)

         Cpu: breakdown of percentage usage of CPU time

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

         If more than 4 disk drives are configured in the system,
         vmstat displays only the first 4 drives, with priority given
         to Massbus disk drives (i.e. if both Unibus and Massbus
         drives are present and the total number of drives exceeds 4,
         then some number of Unibus drives will not be displayed in
         favor of the Massbus drives).  To force vmstat to display
         specific drives, their names may be supplied on the command
         line.

    FILES
         /dev/kmem, /vmunix

    SEE ALSO
         systat(1), iostat(1)

         The sections starting with ``Interpreting system activity''
         in Installing and Operating 4.2bsd.

    Printed 11/26/99	 March 15, 1986                         2

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