PSTAT(8)

NAME
pstat - print system facts

SYNOPSIS
/etc/pstat -[ixptufT][a] [ suboptions ] [ system [ corefile ] ]

DESCRIPTION
Pstat interprets the contents of certain system tables. If corefile is given, the tables are sought there, otherwise in /dev/kmem. The required namelist is taken from /vmunix unless system is specified. Options are

-a  Under -p, describe all process slots rather than just active ones.

-i  Print the inode table with the these headings:

LOC The core location of this table entry.
FLAGS
    Miscellaneous state variables encoded thus:
    L   locked
    U   update time (fs(5)) must be corrected
    A   access time must be corrected
    M   file system is mounted here
    W   wanted by another process (L flag is on)
    T   contains a text file
    C   changed time must be corrected
    S   shared lock applied
    E   exclusive lock applied
    Z   someone waiting for a lock
CNT Number of open file table entries for this inode.
DEV Major and minor device number of file system in which this inode resides.
RDC Reference count of shared locks on the inode.
WRC Reference count of exclusive locks on the inode (this may be > 1 if, for example, a file descriptor is inherited across a fork).
INO I-number within the device.
MODE
    Mode bits, see chmod(2).
NLK Number of links to this inode.
UID User ID of owner.
SIZ/DEV
    Number of bytes in an ordinary file, or major and minor device of special file.

-x  Print the text table with these headings:

LOC The core location of this table entry.
FLAGS
    Miscellaneous state variables encoded thus:
    T   ptrace(2) in effect
    W   text not yet written on swap device
    L   loading in progress
    K   locked
    w   wanted (L flag is on)
    P   resulted from demand-page-from-inode exec format (see execve(2))

DADDR
    Disk address in swap, measured in multiples of 512 bytes.

CADDR
    Head of a linked list of loaded processes using this text segment.

RSS Size of resident text, measured in multiples of 512 bytes.

SIZE
    Size of text segment, measured in multiples of 512 bytes.

IPTR
    Core location of corresponding inode.

CNT Number of processes using this text segment.

CCNT
    Number of processes in core using this text segment.

FORW
    Forward link in free list.

BACK
    Backward link in free list.

-p  Print process table for active processes with these headings:

LOC The core location of this table entry.
S   Run state encoded thus:
    0   no process
    1   waiting for some event
    3   runnable
    4   being created
    5   being terminated
    6   stopped (by signal or under trace)
F   Miscellaneous state variables, or'ed together (hexadecimal):
    0001
        loaded
    0002
        the scheduler process
    0004
        locked for swap out
    0008
        swapped out
    0010
        traced
    0020
        used in tracing
    0080
        in page-wait
    0100
        prevented from swapping during fork(2)
    0200
        will restore old mask after taking signal
    0400
        exiting
    0800
        doing physical I/O (bio.c)
    1000
        process resulted from a vfork(2) which is not yet complete
    2000
        another flag for vfork(2)
    4000
        process has no virtual memory, as it is a parent in the context of vfork(2)
    8000
        process is demand paging data pages from its text inode.
    10000
        process using sequential VM patterns
    20000
        process using random VM patterns
    100000
        using old 4.1-compatible signal semantics
    200000
        process needs profiling tick
    400000
        process is scanning descriptors during select
    1000000
        process page tables have changed
POIP
    number of pages currently being pushed out from this process.
PRI Scheduling priority, see setpriority(2).
SIG Signals received (signals 1-32 coded in bits 0-31),
UID Real user ID.
SLP Amount of time process has been blocked.
TIM Time resident in seconds; times over 127 coded as 127.
CPU Weighted integral of CPU time, for scheduler.
NI  Nice level, see setpriority(2).
PGRP
    Process number of root of process group.
PID The process ID number.
PPID
    The process ID of parent process.
ADDR
    If in core, the page frame number of the first page of the `u-area' of the process. If swapped out, the position in the swap area measured in multiples of 512 bytes.
RSS Resident set size - the number of physical page frames allocated to this process.
SRSS
    RSS at last swap (0 if never swapped).
SIZE
    Virtual size of process image (data+stack) in multiples of 512 bytes.
WCHAN
    Wait channel number of a waiting process.
LINK
    Link pointer in list of runnable processes.
TEXTP
    If text is pure, pointer to location of text table entry.

-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 putput queue.
MODE
    See tty(4).
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)).

-u  print information about a user process; the next argument is its address as given by ps(1). The process must be in main memory, or the file used can be a core image and the address 0. Only the fields located in the first page cluster can be located succesfully if the process is in main memory.

-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 inode table entry or socket structure for this file.
OFFSET
    The file offset (see lseek(2)).

-s print information about swap space usage: the number of (1k byte) pages used and free is given as well as the number of used pages which belong to text images.

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

FILES
/vmunix    namelist
/dev/kmem    default source of tables

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

BUGS
It would be very useful if the system recorded “maximum occupancy” on the tables reported by -T; even more useful if these tables were dynamically allocated.