VMSTAT(1)

NAME
vmstat - display Mach VM statistics

SYNOPSIS
vmstat [-host machine] [-task task] [-dpager pager] [interval]

DESCRIPTION
vmstat(1) displays Mach Virtual Memory statistics. If the optional interval is specified, then vmstat will display the statistics every interval seconds. In this case, each line of output displays the change in each statistic. However, the first line of output following each banner displays the system-wide totals for each statistic. The following values are displayed:

free
    The total number of free pages in the system

active
    The total number of pages on the active list. These pages are currently in use and pageable.

inactive
    The total number of pages on the inactive list. Like active pages, these pages are currently in use and pageable, but they are considered first for pageout.

wired
    The total number of pages wired down. That is, pages that can not be paged out.

faults
    The number of times the "vm_fault_page" routine has been called.

copy
    The number of faults that caused a page to be copied (generally caused by copy-on-write faults).

zeroed
    The number of faults that caused a page to be zeroed (generally caused by zero-fill faults).

reactive
    The number of pages that have been reclaimed from the inactive list.

pageins
    The number of requests for pages from a pager.

pageouts
    The number of pages that have been paged out.

space
    The amount of free backing store available to the default pager.

If interval is not specified, then vmstat displays all accumulated statistics along with the page size, object cache performance, and size of the default pager's backing store.

vmstat interprets the following options:

-host machine
    Directs the inquiry to the machid(1) server running on the specified machine.

-task task
    Explicitly specifies the MachID of the task port to which vm_statistics(2) calls are directed. This defaults to the first task on the specified host.

-dpager default-pager
    Explicitly specifies the MachID of the default pager port to which default_pager_info(2) calls are directed. This defaults to the default pager on the specified host.

SEE ALSO
ms(1), machid(1), vm_statistics(2), default_pager_info(2)