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IRIX Base Documentation 1998 November
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IRIX 6.5.2 Base Documentation November 1998.img
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1998-10-20
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TTTTOOOOPPPP((((1111)))) TTTTOOOOPPPP((((1111))))
NNNNAAAAMMMMEEEE
top - display and update information about the top cpu processes
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
ttttoooopppp [ ----SSSSbbbbiiiiIIIInnnnqqqqTTTTuuuu ] [ ----dddd_c_o_u_n_t ] [ ----ssss_t_i_m_e ] [ ----oooo_f_i_e_l_d ] [ ----UUUU_u_s_e_r_n_a_m_e ] [
_n_u_m_b_e_r ]
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
_T_o_p displays the top processes on the system and periodically updates
this information. If standard output is an intelligent terminal (see
below) then as many processes as will fit on the terminal screen are
displayed by default. Otherwise, a good number of them are shown (around
20). Raw cpu percentage is used to rank the processes. If _n_u_m_b_e_r is
given, then the top _n_u_m_b_e_r processes will be displayed instead of the
default.
_T_o_p makes a distinction between terminals that support advanced
capabilities and those that do not. This distinction affects the choice
of defaults for certain options. In the remainder of this document, an
"intelligent" terminal is one that supports cursor addressing, clear
screen, and clear to end of line. Conversely, a "dumb" terminal is one
that does not support such features. If the output of _t_o_p is redirected
to a file, it acts as if it were being run on a dumb terminal.
OOOOPPPPTTTTIIIIOOOONNNNSSSS
----SSSS Show system processes in the display. The definition of system
processes is system dependent (See below).
----bbbb Use "batch" mode. In this mode, all input from the terminal is
ignored. Interrupt characters (such as ^C and ^\) still have an
effect. This is the default on a dumb terminal, or when the output
is not a terminal.
----iiii Use "interactive" mode. In this mode, any input is immediately read
for processing. See the section on "Interactive Mode" for an
explanation of which keys perform what functions. After the command
is processed, the screen will immediately be updated, even if the
command was not understood. This mode is the default when standard
output is an intelligent terminal.
----IIII Do (or do not) display idle processes (toggle). By default, top
displays only active (ready to run or running on a processor)
processes.
----nnnn Use "non-interactive" mode. This is indentical to "batch" mode.
----qqqq Renice _t_o_p to -20 so that it will run faster. This can be used when
the system is being very sluggish to improve the possibility of
discovering the problem. This option can only be used by root.
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TTTTOOOOPPPP((((1111)))) TTTTOOOOPPPP((((1111))))
----TTTT List data for individual kernel threads. Normally the information
presented is a summation across all threads of the process. This is
of use when examining POSIX threaded processes.
----uuuu Do not take the time to map uid numbers to usernames. Normally, _t_o_p
will read as much of the file "/etc/passwd" as is necessary to map
all the user id numbers it encounters into login names. This option
disables all that, while possibly decreasing execution time. The
uid numbers are displayed instead of the names.
----dddd_c_o_u_n_t
Show only _c_o_u_n_t displays, then exit. A display is considered to be
one update of the screen. This option allows the user to select the
number of displays he wants to see before _t_o_p automatically exits.
For intelligent terminals, no upper limit is set. The default is 1
for dumb terminals.
----ssss_t_i_m_e
Set the delay between screen updates to _t_i_m_e seconds. The default
delay between updates is 4 seconds.
----oooo_f_i_e_l_d
Sort the process display area on the specified field. The field
name is the name of the column as seen in the output, but in lower
case. Likely values are "cpu", "size", "res", and "time", but may
vary on different operating systems. Note that not all operating
systems support this option.
----UUUU_u_s_e_r_n_a_m_e
Show only those processes owned by _u_s_e_r_n_a_m_e. This option currently
only accepts usernames and will not understand uid numbers.
Both _c_o_u_n_t and _n_u_m_b_e_r fields can be specified as "infinite", indicating
that they can stretch as far as possible. This is accomplished by using
any proper prefix of the keywords "infinity", "maximum", or "all". The
default for _c_o_u_n_t on an intelligent terminal is, in fact, iiiinnnnffffiiiinnnniiiittttyyyy.
The environment variable TTTTOOOOPPPP is examined for options before the command
line is scanned. This enables a user to set his or her own defaults.
The number of processes to display can also be specified in the
environment variable TTTTOOOOPPPP. The options ----IIII, ----SSSS, and ----uuuu are actually
toggles. A second specification of any of these options will negate the
first. Thus a user who has the environment variable TTTTOOOOPPPP set to "-I" may
use the command "top -I" to see only active processes.
IIIINNNNTTTTEEEERRRRAAAACCCCTTTTIIIIVVVVEEEE MMMMOOOODDDDEEEE
When _t_o_p is running in "interactive mode", it reads commands from the
terminal and acts upon them accordingly. In this mode, the terminal is
put in "CBREAK", so that a character will be processed as soon as it is
typed. Almost always, a key will be pressed when _t_o_p is between
displays; that is, while it is waiting for _t_i_m_e seconds to elapse. If
this is the case, the command will be processed and the display will be
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TTTTOOOOPPPP((((1111)))) TTTTOOOOPPPP((((1111))))
updated immediately thereafter (reflecting any changes that the command
may have specified). This happens even if the command was incorrect. If
a key is pressed while _t_o_p is in the middle of updating the display, it
will finish the update and then process the command. Some commands
require additional information, and the user will be prompted
accordingly. While typing this information in, the user's erase and kill
keys (as set up by the command _s_t_t_y) are recognized, and a newline
terminates the input.
These commands are currently recognized (^L refers to control-L):
^^^^LLLL Redraw the screen.
hhhh or ????
Display a summary of the commands (help screen).
qqqq Quit _t_o_p.
dddd Change the number of displays to show (prompt for new number).
Remember that the next display counts as one, so typing dddd1111 will make
_t_o_p show one final display and then immediately exit.
nnnn oooorrrr ####
Change the number of processes to display (prompt for new number).
ssss Change the number of seconds to delay between displays (prompt for
new number).
kkkk Send a signal ("kill" by default) to a list of processes. This acts
similarly to the command _k_i_l_l(1)).
rrrr Change the priority (the "nice") of a list of processes. This acts
similarly to the command _r_e_n_i_c_e(8)).
uuuu Display only processes owned by a specific username (prompt for
username). If the username specified is simply "+", then processes
belonging to all users will be displayed.
eeee Display a list of system errors (if any) generated by the last kkkkill
or rrrrenice command.
iiii (or IIII)))) Toggle the display of idle processes.
TTTTHHHHEEEE DDDDIIIISSSSPPPPLLLLAAAAYYYY
The actual display varies depending on the specific variant of Unix that
the machine is running. This description may not exactly match what is
seen by top running on this particular machine. Differences are listed
at the end of this manual entry.
The top few lines of the display show general information about the state
of the system, including the last process id assigned to a process (on
most systems), the three load averages, the current time, the number of
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TTTTOOOOPPPP((((1111)))) TTTTOOOOPPPP((((1111))))
existing processes, the number of processes in each state (sleeping,
running, starting, zombies, and stopped), and a percentage of time spent
in each of the processor states (excuting in user mode, executing in
kernel mode, idle, etc). It also includes information about physical and
virtual memory allocation.
The remainder of the screen displays information about individual
processes. This display is similar in spirit to _p_s(1) but it is not
exactly the same. PID is the process id, PGRP is the process group id,
USERNAME is the name of the process's owner (if ----uuuu is specified, a UID
column will be substituted for USERNAME), PRI is the current priority of
the process, SIZE is the total size of the process (text, data, and
stack), RES is the current amount of resident memory (both SIZE and RES
are given in kilobytes), STATE is the current state (one of "sleep",
"WAIT", "run", "idl", "zomb", or "stop"), TIME is the number of system
and user cpu seconds that the process has used, WCPU, when displayed, is
the weighted cpu percentage (this is the same value that _p_s(1) displays
as CPU), CPU is the raw percentage and is the field that is sorted to
determine the order of the processes, and COMMAND is the name of the
command that the process is currently running (if the process is swapped
out, this column is marked "<swapped>").
NNNNOOOOTTTTEEEESSSS
The "ABANDONED" state (known in the kernel as "SWAIT") was abandoned,
thus the name. A process should never end up in this state.
AAAAUUUUTTTTHHHHOOOORRRR
William LeFebvre, EECS Department, Northwestern University
EEEENNNNVVVVIIIIRRRROOOONNNNMMMMEEEENNNNTTTT
TOP user-configurable defaults for options.
FFFFIIIILLLLEEEESSSS
/dev/kmem kernel memory
/dev/mem physical memory
/etc/passwd used to map uid numbers to user names
/vmunix system image
BBBBUUUUGGGGSSSS
The default for ----IIII is "do not show idle processes". This may be
confusing if you're expecting _t_o_p to display a screenful of processes by
default. To appease folks who can't stand that behavior, I have added
the ability to set "default" options in the environment variable TTTTOOOOPPPP (see
the OPTIONS section). Those who want idle processes displayed need only
set the environment variable TTTTOOOOPPPP to "-I".
The command name for swapped processes should be tracked down, but this
would make the program run slower.
As with _p_s(1), things can change while _t_o_p is collecting information for
an update. The picture it gives is only a close approximation to
reality.
PPPPaaaaggggeeee 4444
TTTTOOOOPPPP((((1111)))) TTTTOOOOPPPP((((1111))))
SSSSEEEEEEEE AAAALLLLSSSSOOOO
kill(1), ps(1), stty(1), mem(4), renice(8)
SSSSGGGGIIII////IIIIRRRRIIIIXXXX NNNNOOOOTTTTEEEESSSS
Multiprocessor support was added. Both number of CPUs and the CPU-ID for
running processes are shown. On MP systems the sum of %CPU (or %WCPU)
numbers may be higher than 100% (one full CPU utilization) but never
higher than 100 * the number of CPUs.
The IRIX implementation doesn't _n_l_i_s_t(_2) the kernel to get addresses of
symbols which makes it less system dependent. All values are retrieved
using the _s_y_s_m_p(_2), _s_y_s_s_g_i(_2), and _p_r_o_c(_4) interfaces. The same
executable should run on any SGI hardware (Uniprocessor, SMP, and S2MP)
running IRIX 6.2 and up.
"last pid" is not supported.
A process is considered to be a "system" process if it has uid=0 and
ppid=1. This is a compromise for the sake of backward compatibility. In
new IRIX systems many of the traditional "system processes" are
implemented either within the kernel as threads, or as real-time
processes.
System processes display can be toggled interactively using the 'S' key.
Idle processes display can be toggled interactively using the 'i' key.
Memory sizes are followed by their units: K (Kilobytes), M (Megabytes), G
(Gigabytes) or T (Terabytes).
The CPU states are sampled every clock tick and provide a "best estimate"
of the system CPU activity summed across all processors. On IRIX they
are:
idle the cpu was idle and not waiting for anything
usr the cpu was executing some user mode code
ker the cpu was executing some kernel mode code
wait the cpu was idle with some i/o outstanding
xbrk the cpu was executing code in a fault path
intr the cpu was handling an interrupt
For example: a high "wait" number means that the system is I/O bound. A
close to 100% "usr" number indicates CPU bound processes with little
system activity. "xbrk" and "intr" should be close to 0.0% under normal
circumstances. Larger numbers may indicate pathologically high low-level
driver activity, memory shortage (high VM activity) etc. in which case
_o_s_v_i_e_w(_1) should give a better picture of the system state.
The PRI (priority) field supports advanced IRIX real-time and scheduling
schemes using the following formats where <pri> is a decimal priority
number:
PPPPaaaaggggeeee 5555
TTTTOOOOPPPP((((1111)))) TTTTOOOOPPPP((((1111))))
+<pri> Real-Time
<pri> Normal (timeshared)
g<pri> Gang scheduled
bc Batch Critical
b Batch
w Weightless
On pre 6.4 systems the supported formats are:
+<pri> Real-Time
<pri> Normal (timeshared)
b<pri> Batch
For more details on new IRIX scheduling and priorities, see _n_p_r_i(_1),
_n_i_c_e(_2), _r_e_a_l_t_i_m_e(_5), and all the _s_c_h_e_d__X_X_X(_2) services.
%WCPU (weighted CPU) is a decaying average of %CPU over a longer period
than just the last sampling period. For short running processes %WCPU
should be close to %CPU as the two values only diverge over time.
This version of top supports sorting by various fields via the command
line -o (order) option or the 'o' interactive option. The aliases 'mem'
(equivalent to 'size'), and 'rss' (equivalent to 'res') are accepted for
friendliness. In addition, the IRIX version of top understands prefixes
of field names, like '-os', instead of '-osize', to be used. In case of
prefix ambiguities, the first one to match will be used. Use 'h' (help)
to list the supported orders.
The old IRIX _g_r__t_o_p is now implemented as a perl script on top of the new
_t_o_p to reduce bloat. In addition to the -Bcolor option to set the
background color, you may now control the foreground color with -Fcolor,
and the title bar color with -Tcolor. Colors are either RGB values or
Xwindow color names, e.g. _p_u_r_p_l_e. (See _s_h_o_w_r_g_b for legal color names.)
SGI specific "See Also" should include: _o_s_v_i_e_w(_1), _n_p_r_i(_1), _r_e_a_l_t_i_m_e(_5),
and _s_c_h_e_d_c_t_l(_2).
Several more sophisticated performance tools are optionally provided by
SGI notably PCP (the Performance CoPilot).
Unlike other _t_o_p versions, the IRIX version should support thousands of
processors and an even larger number of processes. Thus it avoids pre-
allocating a maximum size for process data. In case the number of
processes grows too far a new initialization of data structures is
performed by the program restarting itself. This restarting forgets any
interactive settings and may cause a change in the Weighted CPU%
averages. This should be an extremely rare occurence but should be noted
here.
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TTTTOOOOPPPP((((1111)))) TTTTOOOOPPPP((((1111))))
CCCCRRRREEEEDDDDIIIITTTTSSSS
Original porting to SGI/IRIX 5.x was done by Sandeep Cariapa. Later
enhancements and further IRIX ports by Larry McVoy, John Schimmel, and
Ariel Faigon.
PPPPaaaaggggeeee 7777