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:

LOCThe core location of this table entry. 

FLAGSMiscellaneous state variables encoded thus:

Llocked

Uupdate time (fs(5)) must be corrected

Aaccess time must be corrected

Mfile system is mounted here

Wwanted by another process (L flag is on)

Tcontains a text file

Cchanged time must be corrected

Sshared lock applied

Eexclusive lock applied

Zsomeone waiting for a lock

CNTNumber of open file table entries for this inode. 

DEVMajor and minor device number of file system in which this inode resides. 

RDCReference count of shared locks on the inode. 

WRCReference count of exclusive locks on the inode (this may be > 1 if, for example, a file descriptor is inherited across a fork). 

INOI-number within the device. 

MODEMode bits, see chmod(2).

NLKNumber of links to this inode. 

UIDUser ID of owner. 

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

−x Print the text table with these headings:

LOCThe core location of this table entry. 

FLAGSMiscellaneous state variables encoded thus:

Tptrace(2) in effect

Wtext not yet written on swap device

Lloading in progress

Klocked

wwanted (L flag is on)

Presulted from demand-page-from-inode exec format (see execve(2))

DADDRDisk address in swap, measured in multiples of 512 bytes. 

CADDRHead of a linked list of loaded processes using this text segment. 

RSSSize of resident text, measured in multiples of 512 bytes. 

SIZESize of text segment, measured in multiples of 512 bytes. 

IPTRCore location of corresponding inode. 

CNTNumber of processes using this text segment. 

CCNTNumber of processes in core using this text segment. 

FORWForward link in free list. 

BACKBackward link in free list. 

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

LOCThe core location of this table entry. 

SRun state encoded thus:

0no process

1waiting for some event

3runnable

4being created

5being terminated

6stopped (by signal or  under trace)

FMiscellaneous state variables, or’ed together (hexadecimal):

0001loaded

0002the scheduler process

0004locked for swap out

0008swapped out

0010traced

0020used in tracing

0080in page-wait

0100prevented from swapping during fork(2)

0200will restore old mask after taking signal

0400exiting

0800doing physical I/O (bio.c)

1000process resulted from a vfork(2) which is not yet complete

2000another flag for vfork(2)

4000process has no virtual memory, as it is a parent in the context of vfork(2)

8000process is demand paging data pages from its text inode. 

10000process using sequential VM patterns

20000process using random VM patterns

100000using old 4.1-compatible signal semantics

200000process needs profiling tick

400000process is scanning descriptors during select

1000000process page tables have changed

POIPnumber of pages currently being pushed out from this process. 

PRIScheduling priority, see setpriority(2).

SIGSignals received (signals 1-32 coded in bits 0-31),

UIDReal user ID. 

SLPAmount of time process has been blocked. 

TIMTime resident in seconds; times over 127 coded as 127. 

CPUWeighted integral of CPU time, for scheduler. 

NINice level, see setpriority(2).

PGRPProcess number of root of process group. 

PIDThe process ID number. 

PPIDThe process ID of parent process. 

ADDRIf 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. 

RSSResident set size − the number of physical page frames allocated to this process. 

SRSSRSS at last swap (0 if never swapped). 

SIZEVirtual size of process image (data+stack) in multiples of 512 bytes. 

WCHANWait channel number of a waiting process. 

LINKLink pointer in list of runnable processes. 

TEXTPIf text is pure, pointer to location of text table entry. 

−t Print table for terminals with these headings:

RAWNumber of characters in raw input queue. 

CANNumber of characters in canonicalized input queue. 

OUTNumber of characters in putput queue. 

MODESee tty(4).

COLCalculated column position of terminal. 

STATEMiscellaneous state variables encoded thus:

Tdelay timeout in progress

Wwaiting for open to complete

Oopen

Foutq has been flushed during DMA

Ccarrier is on

Bbusy doing output

Aprocess is awaiting output

Xopen for exclusive use

Soutput stopped

Hhangup on close

PGRPProcess group for which this is controlling terminal. 

DISCLine 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:

LOCThe core location of this table entry. 

TYPEThe type of object the file table entry points to. 

FLGMiscellaneous state variables encoded thus:

Ropen for reading

Wopen for writing

Aopen for appending

Sshared lock present

Xexclusive lock present

Isignal pgrp when data ready

CNTNumber of processes that know this open file. 

MSGNumber of messages outstanding for this file. 

DATAThe location of the inode table entry or socket structure for this file. 

OFFSETThe 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

/vmunixnamelist
/dev/kmemdefault 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. 

4th Berkeley Distribution  —  Revision 1.5 of 04/09/89