VM_STAT(1)

NAME
vm_stat - show Mach virtual memory statistics

SYNOPSIS
vm_stat [interval]

DESCRIPTION
vm_stat displays Mach virtual memory statistics. If the optional interval is specified, then vm_stat will display the statistics every interval seconds. In this case, each line of output displays the change in each statistic (an interval count of 1 displays the values per second). However, the first line of output following each banner displays the system-wide totals for each statistic. The following values are displayed:
Pages free
    the total number of free pages in the system.
Pages active
    the total number of pages currently in use and pageable.
Pages inactive
    the total number of pages on the inactive list.
Pages wired down
    the total number of pages wired down. That is, pages that cannot be paged out.
Translation faults
    the number of times the "vm_fault" routine has been called.
Pages copy-on-write
    the number of faults that caused a page to be copied (generally caused by copy-on-write faults).
Pages zero filled
    the total number of pages that have been zero-filled on demand.
Pages reactivated
    the total number of pages that have been moved from the inactive list to the active list (reactivated).
Pageins
    the number of requests for pages from a pager (such as the inode pager).
Pageouts
    the number of pages that have been paged out.

    If interval is not specified, then vm_stat displays all accumulated statistics along with the page size and the object cache performance.

SEE ALSO
vm_statistics(2)