PSTAT(8)

NAME
pstat, swapinfo - display system data structures

SYNOPSIS
pstat [-Tfghkmnst] [-M core [-N system]]
swapinfo [-ghkm] [-M core [-N system]]

DESCRIPTION
The pstat utility displays open file entry, swap space utilization, terminal state, and vnode data structures.

If invoked as swapinfo the -s option is implied, and only the -k, -m, -g, and -h options are legal.

If the -M option is not specified, information is obtained from the currently running kernel via the sysctl(3) interface. Otherwise, information is read from the specified core file, using the name list from the specified kernel image (or from the default image).

The following options are available:

-n  Print devices out by major/minor instead of name.

-h  “Human-readable” output. Use unit suffixes when printing swap partition sizes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte.

-k  Print sizes in kilobytes, regardless of the setting of the BLOCKSIZE environment variable.

-m  Print sizes in megabytes, regardless of the setting of the BLOCKSIZE environment variable.

-g  Print sizes in gigabytes, regardless of the setting of the BLOCKSIZE environment variable.

-T  Print the number of used and free slots in several system tables. This 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
        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 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
        Device name.

    INQ Number of characters that can be stored in the input queue.

    CAN Number of characters in the input queue which can be read.

    LIN Number of characters in the input queue which cannot be read yet.

    LOW Low water mark for input.

    OUTQ
        Number of characters that can be stored in the output queue.

    USE Number of bytes in the output queue.

    LOW Low water mark for output.

    COL Calculated column position of terminal.

    SESS
        Kernel address of the session structure.

    PGID
        Process group for which this is the controlling terminal.

    STATE
        Miscellaneous state variables encoded thus:

        I   init/lock-state device nodes present
        C   callout device nodes present
        O   opened
        c   console in use
        G   gone
        B   busy in open(2)
        Y   send SIGIO for input events
        L   next character is literal
        H   high watermark reached
        X   open for exclusive use
        S   output stopped (ixon flow control)
        l   block mode input routine in use
        Z   connection lost
        s   i/o being snooped
        b   busy in read(2) or write(2)

        The ‘i’ and ‘o’ characters refer to the previous character, to differentiate between input and output.

-M  Extract values associated with the name list from the specified core.

-N  If -M is also specified, extract the name list from the specified system instead of the default, which is the kernel image the system has booted from.

SEE ALSO
ps(1), systat(1), stat(2), fs(5), iostat(8), vmstat(8) UNIX Implementation, K. Thompson.

HISTORY
The pstat utility appeared in 4.0BSD.

BUGS
Does not understand NFS swap servers.