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pstat(8)		  BSD System Manager's Manual		      pstat(8)


     pstat - display system data structures


     pstat [-Tfnstv] [-M core] [-N system]


     Pstat displays open file entry, swap space utilization, terminal state,
     and vnode data structures.	 If corefile is given, the information is
     sought there, otherwise in /dev/kmem.  The required namelist is taken
     from /vmunix unless system is specified.  The -n option specifies that
     devices should be printed out by major/minor number rather than by name.

     Options are

     -T	     Prints the number of used and free slots in the several system
	     tables and is useful for checking to see how large system tables
	     have become if the system is under heavy load.

     -f	     Print the open file table with these headings:

	     LOC     The core location of this table entry.

	     TYPE    The type of object the file table entry points to.

	     FLG     Miscellaneous state variables encoded thus:

		     R	     open for reading

		     W	     open for writing

		     A	     open for appending

		     S	     shared lock present

		     X	     exclusive lock present

		     I	     signal pgrp when data ready

	     CNT     Number of processes that know this open file.

	     MSG     Number of messages outstanding for this file.

	     DATA    The location of the vnode table entry or socket structure
		     for this file.

	     OFFSET  The file offset (see lseek(2)).

     -s	     Print information about swap space usage on all the swap areas
	     compiled into the kernel.	The first column is the device name of
	     the partition.  The next column is the total space available in
	     the partition.  The Used column indicates the total blocks used
	     so far;  the Available column indicates how much space is remain-
	     ing on each partition.  The Capacity reports the percentage of
	     space used.

	     If more than one partition is configured into the system, totals
	     for all of the statistics will be reported in the final line of
	     the report.

     -t	     Print table for terminals with these headings:

	     RAW     Number of characters in raw input queue.

	     CAN     Number of characters in canonicalized input queue.

	     OUT     Number of characters in output queue.

	     MODE    See tty(4).

	     ADDR    Physical device address.

	     DEL     Number of delimiters (newlines) in canonicalized input

	     COL     Calculated column position of terminal.

	     STATE   Miscellaneous state variables encoded thus:

		     T	     delay timeout in progress

		     W	     waiting for open to complete

		     O	     open

		     F	     outq has been flushed during DMA

		     C	     carrier is on

		     B	     busy doing output

		     A	     process is awaiting output

		     X	     open for exclusive use

		     S	     output stopped

		     H	     hangup on close

	     PGRP    Process group for which this is controlling terminal.

	     DISC    Line discipline; blank is old tty OTTYDISC or `new tty'
		     for NTTYDISC or `net' for NETLDISC (see bk(4)).

     -v	     Print the active vnodes.  Each group of vnodes corresponding to a
	     particular filesystem is preceded by a two line header.  The
	     first line consists of the following:

	     *** MOUNT fstype from on on fsflags

	     where fstype is one of ufs, nfs, mfs, or pc; from is the filesys-
	     tem is mounted from; on is the directory the filesystem is
	     mounted on; and fsflags is a list of optional flags applied to
	     the mount (see mount(8)).	the first part of which are fixed, and
	     the second part are filesystem type specific.  The headers common
	     to all vnodes are:

	     ADDR    Location of this vnode.

	     TYP     File type.


		     A list of letters representing vnode flags:

		     R	     - VROOT

		     T	     - VTEXT

		     L	     - VXLOCK

		     W	     - VXWANT

		     E	     - VEXLOCK

		     S	     - VSHLOCK

		     T	     - VLWAIT

		     A	     - VALIASED

		     B	     - VBWAIT

	     USE     The number of references to this vnode.

	     HOLD    The number of I/O buffers held by this vnode.

	     FILEID  The vnode fileid.	In the case of ufs this is the inode

	     IFLAG   Miscellaneous filesystem specific state variables encoded

		     For ufs:

			     L	     locked

			     U	     update time (fs(5)) must be corrected

			     A	     access time must be corrected

			     W	     wanted by another process (L flag is on)

			     C	     changed time must be corrected

			     S	     shared lock applied

			     E	     exclusive lock applied

			     Z	     someone waiting for a lock

			     M	     contains modifications

			     R	     has a rename in progress

		     For nfs:

			     W	     waiting for I/O buffer flush to complete

			     P	     I/O buffers being flushed

			     M	     locally modified data exists

			     E	     an earlier write failed

			     X	     non-cacheable lease (nqnfs)

			     O	     write lease (nqnfs)

			     G	     lease was evicted (nqnfs)

		     Number of bytes in an ordinary file, or major and minor
		     device of special file.


     /vmunix	   namelist
     /dev/kmem	   default source of tables


     iostat(1), ps(1), systat(1), vmstat(1), stat(2), fs(5),


     Swap statistics are reported for all swap partitions compiled into the
     kernel, regardless of whether those partitions are being used.

     Does not understand NFS swap servers.


     The pstat command appeared in 4.0BSD.

4th Berkeley Distribution	 May 13, 1994	     4th Berkeley Distribution

Mac OS X 10.3 - Generated Sat Jun 7 16:37:24 CDT 2008
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