PSTAT(8)

PSTAT(8) | System Manager's Manual | PSTAT(8)

# NAME

pstat — display system data structures

# SYNOPSIS

pstat | [-T | -f | -s | -t | -v] [-ghkmn] [-M core] [-N system]

# DESCRIPTION

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 /netbsd unless system is specified.

The following options are available:

-T
  Prints the number of used and free slots for open files, used vnodes, and swap space. This option is useful for checking to see how large system tables 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.
  USE
    Number of active users of this open file.
  IFLG
    Value of internal flags.
  OFFSET
    The file offset (see lseek(2)).
-g
  The -g option uses (1024 * 1024 * 1024) byte blocks instead of the default 512 byte.
-h
  Use humanize_number(3) to display (swap) sizes.
-k
  Use 1K-byte blocks.
-m
  The -m option uses (1024 * 1024) byte blocks instead of the default 512 byte.
-n
  Print devices by major/minor number rather than by name.
-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
  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 queue.
  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:

    T
      delay timeout in progress
    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
    K
      further input blocked
    Y
      tty in async I/O mode
    D
      state for lowercase ‘`\`' work
    E
      within a ‘`\.../`' for PRTRUB
    L
      next character is literal
    P
      retyping suspended input (PENDIN)
    N
      counting tab width, ignore FLUSHO
    >
      tty used for dialout
  SESS
    Session for which this is controlling terminal.
  PGID
    Current foreground process group associated with this terminal.
  DISC
    Line discipline; ‘`term`' for TTYDISC (see termios(4)), ‘`tab`' for TABLDISC (see tb(4)), ‘`slip`' for SLIPDISC (see sl(4)), ‘`ppp`' for PPPDISC (see ppp(4)), ‘`strip`' for STRIPDISC (see strip(4)), ‘`hdlc`' for HDLCDISC.
-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, fdesc, ffs, ext2fs, kernfs, lfs, lofs, mfs, msdos, nfs, null, procfs, umap, union; from is the filesystem 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 is a tty.
    E
      VEXECMAP vnode has PROT_EXEC mappings.
    L
      VXLOCK locked to change underlying type.
    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.
    Y
      VLAYER vnode is on layer filesystem.
    O
      VONWORKLST vnode is on syncer work-list.

  USE
    The number of references to this vnode.
  HOLD
    The number of I/O buffers held by this vnode.
  TAG
    The type of underlying data.
  NPAGE
    The number of pages in this vnode.
  FILEID
    The vnode fileid. In the case of ffs or ext2fs this is the inode number.
  IFLAG
    Miscellaneous filesystem specific state variables encoded thus:
    For ffs, lfs or ext2fs:
      A
        access time must be corrected
      C
        changed time must be corrected
      U
        update time (fs(5)) must be corrected
      M
        contains modifications
      a
        has been accessed
      R
        has a rename in progress
      S
        shared lock applied
      E
        exclusive lock applied
      c
        is being cleaned (LFS)
      D
        directory operation in progress (LFS)
      s
        blocks to be freed in free count
    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
      A
        special file accessed
      U
        special file updated
      C
        special file times changed
  SIZ/RDEV
    Number of bytes in an ordinary file, or major and minor device of special file.

# ENVIRONMENT

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.

# FILES

/netbsd
  namelist
/dev/kmem
  default source of tables

# SEE ALSO

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

K. Thompson, Tn UNIX Implementation.

# HISTORY

The pstat command appeared in 4.0BSD.

# BUGS

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.

December 5, 2009 | NetBSD 5.99