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VM_STAT(1)							    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)

NeXT Computer, Inc.		    3/24/89			    VM_STAT(1)

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