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+.\" Copyright (c) 1997, Apple Computer, Inc.  All rights reserved.
+.\"
+.Dd August 13, 1997
+.Dt VM_STAT 1
+.Os "Mac OS X"
+.Sh NAME
+.Nm vm_stat
+.Nd show Mach virtual memory statistics
+.Sh SYNOPSIS
+.Nm vm_stat
+.Oo
+.Op Fl c Ar count
+.Ar interval
+.Oc
+.Sh DESCRIPTION
+.Nm vm_stat 
+displays Mach virtual memory statistics.  If the optional 
+.Ar interval 
+is specified, then 
+.Nm vm_stat 
+will display the statistics every 
+.Ar interval 
+seconds.  In this case, each line of output displays the change in
+each statistic (an
+.Ar 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.
+If a
+.Ar count
+is provided, the command will terminate after
+.Ar count
+intervals.
+The following values are displayed:
+.Bl -tag -width indent
+.It Pages free
+the total number of free pages in the system.
+.It Pages active
+the total number of pages currently in use and pageable.
+.It Pages inactive
+the total number of pages on the inactive list.
+.It Pages speculative
+the total number of pages on the speculative list.
+.It Pages throttled
+the total number of pages on the throttled list (not wired but not pageable). 
+.It Pages wired down
+the total number of pages wired down.  That is, pages that cannot be
+paged out.
+.It Pages purgeable
+the total number of purgeable pages.
+.It Translation faults
+the number of times the "vm_fault" routine has been called.
+.It Pages copy-on-write
+the number of faults that caused a page to be
+copied (generally caused by copy-on-write faults).
+.It Pages zero filled
+the total number of pages that have been zero-filled on demand.
+.It Pages reactivated
+the total number of pages that have been moved from the inactive list
+to the active list (reactivated).
+.It Pages purged
+the total number of pages that have been purged.
+.It File-backed pages
+the total number of pages that are file-backed (non-swap)
+.It Anonymous pages
+the total number of pages that are anonymous
+.It Uncompressed pages
+the total number of pages (uncompressed) held within the compressor
+.It Pages used by VM compressor:
+the number of pages used to store compressed VM pages.
+.It Pages decompressed
+the total number of pages that have been decompressed by the VM compressor.
+.It Pages compressed
+the total number of pages that have been compressed by the VM compressor.
+.It Pageins
+the total number of requests for pages from a pager (such as the inode pager).
+.It Pageouts
+the total number of pages that have been paged out.
+.It Swapins
+the total number of compressed pages that have been swapped out to disk.
+.It Swapouts
+the total number of compressed pages that have been swapped back in from disk.
+.El
+.Pp
+If 
+.Ar interval 
+is not specified, then 
+.Nm vm_stat 
+displays all accumulated statistics along with the page size.