PSTAT(8)

NAME
pstat - display system data structures

SYNOPSIS
pstat [-Tfknstv] [-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 /bsd 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. It 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.

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

-k  Use 1K-byte blocks.

-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
        W   waiting for open to complete
        O   open
        F   outq has been flushed during DMA
        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

    SESS
        Enclosing session.

PGRP
    Process group for which this is controlling 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)).

-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, kernfs, lfs, lofs, mfs, msdos, nfs, null, portal, procfs, ufs, umap, union; from is 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 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.
        L   VXLOCK locked to change underlying type.
        W   VXWANT process is waiting for vnode.
        S   VSYSTEM vnode being used by kernel.
        A   VALIASED vnode has an alias
        B   VBWAIT waiting for output to complete
        D   VDIROP lfs vnode involved in directory op.

    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 number.

    IFLAG
        Miscellaneous filesystem specific state variables encoded thus:

        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)

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

ENVIRONMENT VARIABLES

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
/bsd
    namelist
/dev/kmem
    default source of tables

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

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.

HISTORY
The pstat command appeared in 4.0BSD.