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Annotation of cci/usr/src/man/man1/vmstat.1, revision 1.1

1.1     ! root        1: .TH VMSTAT 1 "26 April 1981"
        !             2: .de s1
        !             3: .if n .sp
        !             4: .if t .sp .1i
        !             5: ..
        !             6: .de t1
        !             7: .if n .ta 5n
        !             8: .if t .ta 1i
        !             9: ..
        !            10: .UC 4
        !            11: .SH NAME
        !            12: vmstat \- report virtual memory statistics
        !            13: .SH SYNOPSIS
        !            14: .B vmstat
        !            15: [
        !            16: .B \-fs
        !            17: ]
        !            18: [ interval [ count ] ]
        !            19: .SH DESCRIPTION
        !            20: .I Vmstat
        !            21: delves into the system and normally reports certain statistics kept about
        !            22: process, virtual memory, disk, trap and cpu activity.
        !            23: If given a
        !            24: .B \-f
        !            25: argument, it instead reports on the number of
        !            26: .I forks
        !            27: and
        !            28: .I vforks
        !            29: since system startup and the number of pages of virtual memory involved in each
        !            30: kind of fork.
        !            31: If given a
        !            32: .B \-s
        !            33: argument, it instead prints the contents
        !            34: of the
        !            35: .I sum
        !            36: structure, giving the total number of several kinds of paging related
        !            37: events which have occurred since boot.
        !            38: .PP
        !            39: If none of these options are given,
        !            40: .I vmstat
        !            41: will report in the first line a summary of the virtual memory activity 
        !            42: since the system has been booted.
        !            43: If
        !            44: .I interval
        !            45: is specified, then successive lines are summaries over the last
        !            46: .I interval
        !            47: seconds.
        !            48: ``vmstat 5'' will print what the system is doing every five seconds;
        !            49: this is a good choice of printing interval since this is how often
        !            50: some of the statistics are sampled in the system; others vary every
        !            51: second, running the output for a while will make it apparent which
        !            52: are recomputed every second.
        !            53: If a
        !            54: .I count
        !            55: is given, the statistics are repeated
        !            56: .I count
        !            57: times.
        !            58: The format fields are:
        !            59: .PP
        !            60: Procs: information about numbers of processes in various states.
        !            61: .s1
        !            62: .t1
        !            63: .nf
        !            64: r      in run queue
        !            65: b      blocked for resources (i/o, paging, etc.)
        !            66: w      runnable or short sleeper (< 20 secs) but swapped
        !            67: .fi
        !            68: .s1
        !            69: Memory: information about the usage of virtual and real memory.
        !            70: Virtual pages are considered active if they belong to processes which
        !            71: are running or have run in the last 20 seconds.
        !            72: A ``page'' here is 1024 bytes.
        !            73: .s1
        !            74: .t1
        !            75: .nf
        !            76: avm    active virtual pages
        !            77: fre    size of the free list
        !            78: .fi
        !            79: .s1
        !            80: Page: information about page faults and paging activity.
        !            81: These are averaged each five seconds, and given in units per second.
        !            82: .s1
        !            83: .t1
        !            84: .nf
        !            85: re     page reclaims (simulating reference bits)
        !            86: pi     pages paged in
        !            87: po     pages paged out
        !            88: fr     pages freed per second
        !            89: de     anticipated short term memory shortfall
        !            90: sr     pages scanned by clock algorithm, per-second
        !            91: .fi
        !            92: .s1
        !            93: up/hp/rk: Disk operations per second (this field is system dependent).
        !            94: Typically paging will be split across several of the available drives.
        !            95: The number under each of these is the unit number.
        !            96: .s1
        !            97: Faults: trap/interrupt rate averages per second over last 5 seconds.
        !            98: .s1
        !            99: .t1
        !           100: .nf
        !           101: in     (non clock) device interrupts per second
        !           102: sy     system calls per second
        !           103: cs     cpu context switch rate (switches/sec)
        !           104: .fi
        !           105: .s1
        !           106: Cpu: breakdown of percentage usage of CPU time
        !           107: .s1
        !           108: .nf
        !           109: us     user time for normal and low priority processes
        !           110: sy     system time
        !           111: id     cpu idle
        !           112: .SH FILES
        !           113: /dev/kmem, /vmunix
        !           114: .SH SEE ALSO
        !           115: The sections starting with ``Interpreting system activity'' in
        !           116: .IR "Installing and Operating 4.2bsd" .
        !           117: .SH AUTHORS
        !           118: William Joy and Ozalp Babaoglu
        !           119: .SH BUGS
        !           120: There should be a screen oriented program which combines
        !           121: .I vmstat
        !           122: and
        !           123: .IR ps (1)
        !           124: in real time
        !           125: as well as reporting on other system activity.

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