pstat —
display system data structures
  
    | pstat | [ -T|-f|-s|-t|-v] [-ghkmn]
      [-Mcore]
      [-Nsystem] | 
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 -goption 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 -moption 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 ,
          ‘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 onon 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
- VV_ROOT root of its file system.
- T
- VI_TEXT pure text prototype.
- S
- VV_SYSTEM vnode being used by kernel.
- I
- VV_ISTTY vnode is a tty.
- E
- VI_EXECMAP vnode has PROT_EXEC mappings.
- D
- VU_DIROP lfs vnode involved in directory op.
- O
- VI_ONWORKLST vnode is on syncer work-list.
- M
- VV_MPSAFE file system is multithreaded
 
- 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.
 
  - BLOCKSIZE
- If the environment variable BLOCKSIZEis set, and
      the-koption is not specified, the block counts
      will be displayed in units of that size block.
  - /netbsd
- namelist
- /dev/kmem
- default source of tables
Thepstat command appeared in
  4.0BSD.
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.