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NAME    [Toc]    [Back]

     pstat - display system data structures

SYNOPSIS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

     pstat displays open file entry, swap space utilization, terminal state,
     and vnode data structure information.  If corefile is given,
the information
 is sought there, otherwise in the  running  kernel  via
/dev/kmem.  The
     required  namelist  is  taken from the running kernel unless
system is specified.

     The options are as follows:

     -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
                     L       exclusive or shared lock present
                     I       signal pgrp when data ready

             CNT      Number  of  processes  that  know this open

             MSG     Number  of  messages  outstanding  for  this

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

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

     -k      Use 1K-byte blocks.

     -M core
             Extract values associated with the  name  list  from
the specified
             core instead of the running kernel.

     -N system
             Extract  the name list from the specified system instead of the
             running kernel.

     -n      Print devices by major/minor number rather  than  by

     -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 remaining
 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       Prints  the  number of used and free slots for open
files, used vnodes,
 and swap space.  It is useful for checking  to
see how large
             system  tables  become  if the system is under heavy

     -t      Print table for terminals with these headings:

             LINE    Physical device name.

             RAW     Number of characters in raw input queue.

             CAN     Number of characters in canonicalized  input

             OUT     Number of characters in output queue.

             HWT     High water mark for output.

             LWT     Low water mark for output.

             COL     Calculated column position of terminal.

             STATE   Miscellaneous state variables encoded thus:

                     W       waiting for open to complete
                     O       open
                     C       carrier is on
                     T       delay timeout in progress
                     F       outq has been flushed during DMA
                     B       busy doing output
                     A       process is awaiting output
                     X       open for exclusive use
                     S       output stopped
                     K       further input blocked
                     Y       tty in async I/O mode
                     D        next character is escaped lowercase
                     E       printing erase sequence
                     L       next character is literal
                     P       retyping suspended input
                     N       counting tab width, ignoring  output

             SESS    Enclosing session.

             PGID     Process group for which this is controlling

             DISC    Line discipline;  `term'  for  TTYDISC  (see
                     `tab'  for  TABLDISC (see tb(4)), `slip' for
                     sl(4)),  `ppp'  for  PPPDISC  (see  ppp(4)),
`strip' for
                     STRIPDISC (see strip(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 adosfs, afs, cd9660, ext2fs,
fdesc, ffs,
             kernfs, lfs, lofs, mfs, msdos,  nfs,  null,  portal,
procfs, umap,
             union;  from  is  the  partition  the  filesystem 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
             second line is a header for the  individual  fields,
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.

             VFLAG   A list of letters representing vnode flags:

                     R       VROOT root of its file system.
                     T       VTEXT pure text prototype.
                     S       VSYSTEM vnode being used by  kernel.
                     I       VISTTY vnode represents a tty.
                     L        VXLOCK  locked to change underlying
                     W       VXWANT process is waiting for vnode.
                     B        VBWAIT  waiting  for output to complete.
                     A       VALIASED vnode has an alias.
                     D       VDIROP lfs vnode involved in  directory op.
                     F       VONFREELIST vnode is on a free list.
                     l       VLOCKSWORK FS supports locking  discipline.
                     s       VONSYNCLIST vnode is on syncer worklist.

             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 ffs this
is the inode

             IFLAG    Miscellaneous  filesystem  specific   state
variables encoded

                     For ffs:
                             A       access time must be corrected
                             C       changed time  must  be  corrected
                             U        update time (fs(5)) must be
                             R       has a rename in progress
                             M       contains modifications
                             S       shared lock applied
                             E       exclusive lock applied

                     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)
                             A       special file accessed
                             U       special file updated
                             C       special file times changed

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

ENVIRONMENT    [Toc]    [Back]

     BLOCKSIZE  If the environment variable BLOCKSIZE is set, and
the -k option
 is not specified, the block counts  will  be
displayed in
                units of that size block.

SEE ALSO    [Toc]    [Back]

     fstat(1),  procmap(1), ps(1), systat(1), stat(2), fs(5), iostat(8),

     K. Thompson, UNIX Implementation.

HISTORY    [Toc]    [Back]

     The pstat command appeared in 4.0BSD.

BUGS    [Toc]    [Back]

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

     Does not understand NFS swap servers.

OpenBSD     3.6                          April      19,      1994
[ Back ]
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