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vmstat (8)
  • vmstat (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • >> vmstat (8) ( FreeBSD man: Команды системного администрирования )
  • vmstat (8) ( Linux man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    vmstat
    
     - report virtual memory statistics
    
     
    

    SYNOPSIS

    [-afHhimPsz ] [-c count ] [-M core [-N system ] ] [-w wait ] [-n devs ] [-p type , if , pass ] [disks ]  

    DESCRIPTION

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

    If the -M option is not specified, information is obtained from the currently running kernel via the sysctl(3) interface. Otherwise, information is read from the specified core file, using the name list from the specified kernel image (or from the default image).

    The options are as follows:

    -a
    When used with -i include statistics about interrupts that have never been generated.
    -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 repeat count is specified, and -w is specified, the default is infinity, otherwise the default is one.
    -f
    Report on the number fork(2), vfork(2) and rfork(2) system calls since system startup, and the number of pages of virtual memory involved in each.
    -h
    Changes memory columns into more easily human readable form. Default if standard output is a terminal device.
    -H
    Changes memory columns into straight numbers. Default if standard output is not a terminal device (such as a script).
    -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
    -N
    If -M is also specified, extract the name list from the specified system instead of the default, which is the kernel image the system has booted from.
    -m
    Report on the usage of kernel dynamic memory allocated using malloc(9) by type.
    -n
    Change the maximum number of disks to display from the default of 2.
    -P
    Report per-cpu system/user/idle cpu statistics.
    -p
    Specify which types of devices to display. There are three different categories of devices:

    device type:

    da
    Direct Access devices
    sa
    Sequential Access devices
    printer
    Printers
    proc
    Processor devices
    worm
    Write Once Read Multiple devices
    cd
    CD devices
    scanner
    Scanner devices
    optical
    Optical Memory devices
    changer
    Medium Changer devices
    comm
    Communication devices
    array
    Storage Array devices
    enclosure
    Enclosure Services devices
    floppy
    Floppy devices

    interface:

    IDE
    Integrated Drive Electronics devices
    SCSI
    Small Computer System Interface devices
    other
    Any other device interface

    passthrough:

    pass
    Passthrough devices

    The user must specify at least one device type, and may specify at most one device type from each category. Multiple device types in a single device type statement must be separated by commas.

    Any number of -p arguments may be specified on the command line. All -p arguments are ORed together to form a matching expression against which all devices in the system are compared. Any device that fully matches any -p argument will be included in the output, up to two devices, or the maximum number of devices specified by the user.

    -s
    Display the contents of the sum structure, giving the total number of several kinds of paging related events which have occurred since system startup.
    -w
    Pause wait seconds between each display. If no repeat wait interval is specified, the default is 1 second.
    -z
    Report on memory used by the kernel zone allocator, uma(9), by zone.

    By default, 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.

    flt
    total number of page faults
    re
    page reclaims (simulating reference bits)
    pi
    pages paged in
    po
    pages paged out
    fr
    pages freed per second
    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 two characters of the disk name and the unit number. If more than two disk drives are configured in the system, displays only the first two drives, unless the user specifies the -n argument to increase the number of drives displayed. This will probably cause the display to exceed 80 columns, however. To force to display specific drives, their names may be supplied on the command line. The utility defaults to show disks first, and then various other random devices in the system to add up to two devices, if there are that many devices in the system. If devices are specified on the command line, or if a device type matching pattern is specified (see above), will only display the given devices or the devices matching the pattern, and will not randomly select other devices in the system.
    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

     

    FILES

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

     

    EXAMPLES

    The command:
    vmstat -w 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.

    The command:

    vmstat -p da -p cd -w 1
    will tell vmstat to select the first two direct access or CDROM devices and display statistics on those devices, as well as other systems statistics every second.  

    SEE ALSO

    fstat(1), netstat(1), nfsstat(1), ps(1), systat(1), libmemstat(3), gstat(8), iostat(8), pstat(8), sysctl(8), malloc(9), uma(9)

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

    BUGS

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


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    FILES
    EXAMPLES
    SEE ALSO
    BUGS


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