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top command

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the top command is a system monitor tool that produces a frequently-updated list of processes. The top command was inspired by the monitor process/topcpu  command found in the VMS operating system. William LeFebvre wrote the first implementation of top in April 1984 for BSD 4.1 while a graduate student at Rice University. It was released as an Open source project under the BSD license, which allowed it to be included in numerous proprietary BSD and UNIX operating systems.

By default, the processes are ordered by percentage of CPU usage, with only the "top" CPU consumers shown. The top command shows how much processing power and memory are being used, as well as other information about the running processes. Some versions of top allow extensive customization of the display, such as choice of columns or sorting method.

The list is both real-time and interactive.

To exit top  press the q key. Useful interactive commands that you can use:

For more information see Reference

There are 3 general states your CPU can be in:

These three meta states can be further subdivided. For example, user space programs can be categorized as those running under their initial priority level or those running with a nice priority. Niceness is a way to tweak the priority level of a process so that it runs less frequently. The niceness level ranges from -20 (most favorable scheduling) to 19 (least favorable). By default processes on Linux are started with a niceness of 0. See our blog post Restricting process CPU usage using nice, cpulimit, and cgroups for more information on nice.


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[Nov 08, 2018] collectl

/n/n
/n
Nov 08, 2018 | collectl.sourceforge.net
/n /n/n
/n /n /n /n/n /n /n/n /n /n/n /n /n/n /n /n/n /n /n
Collectl/n
Latest Version: 4.2.0 June 12, 2017
To use it download the tarball, unpack it and run ./INSTALL
/n Collectl now supports OpenStack Clouds
/n Colmux now part of collectl package
/n Looking for colplot ? It's now here!/n/n

Remember, to get lustre/n support contact Peter Piela to get his/n custom plugin.

/n
/n/n
/n Home | Architecture |/n Features |/n Documentation | Releases | FAQ | Support | News | Acknowledgements/n
/n/n

There are a number of times in which you find yourself needing performance data. These can/n include benchmarking, monitoring a system's general heath or trying to determine what your/n system was doing at some time in the past. Sometimes you just want to know what the system is/n doing right now. Depending on what you're doing, you often end up using different tools, each/n designed to for that specific situation.

/n/n

Unlike most monitoring tools that either focus on a small set of statistics, format their/n output in only one way, run either interatively or as a daemon but not both, collectl tries to/n do it all. You can choose to monitor any of a broad set of subsystems which currently include/n buddyinfo, cpu, disk, inodes, infiniband, lustre, memory, network, nfs, processes, quadrics,/n slabs, sockets and tcp.

/n/n

The following is an example taken while writing a large file and running the collectl/n command with no arguments. By default it shows cpu, network and disk stats in brief/n format . The key point of this format is all output appears on a single line making it much/n easier to spot spikes or other anomalies in the output:

/n
/ncollectl/n/n#<--------CPU--------><-----------Disks-----------><-----------Network---------->/n#cpu sys inter  ctxsw KBRead  Reads  KBWrit Writes netKBi pkt-in  netKBo pkt-out/n  37  37   382    188      0      0   27144    254     45     68       3      21/n  25  25   366    180     20      4   31280    296      0      1       0       0/n  25  25   368    183      0      0   31720    275      2     20       0       1/n
In this example, taken while writing to an NFS mounted filesystem, collectl displays/ninterrupts, memory usage and nfs activity with timestamps. Keep in mind that you can mix and match/nany data and in the case of brief format you simply need to have a window wide enough to/naccommodate your output./n
/ncollectl -sjmf -oT/n/n#         <-------Int--------><-----------Memory-----------><------NFS Totals------>/n#Time     Cpu0 Cpu1 Cpu2 Cpu3 Free Buff Cach Inac Slab  Map  Reads Writes Meta Comm/n08:36:52  1001   66    0    0   2G 201M 609M 363M 219M 106M      0      0    5    0/n08:36:53   999 1657    0    0   2G 201M   1G 918M 252M 106M      0  12622    0    2/n08:36:54  1001 7488    0    0   1G 201M   1G   1G 286M 106M      0  20147    0    2/n
You can also display the same information in verbose format , in which case you get a/nsingle line for each type of data at the expense of more screen real estate, as can be seen in this/nexample of network data during NFS writes. Note how you can actually see the network traffic stall/nwhile waiting for the server to physically write the data./n
/ncollectl -sn --verbose -oT/n/n# NETWORK SUMMARY (/sec)/n#          KBIn  PktIn SizeIn  MultI   CmpI  ErrIn  KBOut PktOut  SizeO   CmpO ErrOut/n08:46:35   3255  41000     81      0      0      0 112015  78837   1454      0      0/n08:46:36      0      9     70      0      0      0     29     25   1174      0      0/n08:46:37      0      2     70      0      0      0      0      2    134      0      0/n
In this last example we see what detail format looks like where we see multiple lines/nof output for a partitular type of data, which in this case is interrupts. We've also elected to/nshow the time in msecs as well./n
/ncollectl -sJ -oTm/n/n#              Int    Cpu0   Cpu1   Cpu2   Cpu3   Type            Device(s)/n08:52:32.002   225       0      4      0      0   IO-APIC-level   ioc0/n08:52:32.002   000    1000      0      0      0   IO-APIC-edge    timer/n08:52:32.002   014       0      0     18      0   IO-APIC-edge    ide0/n08:52:32.002   090       0      0      0  15461   IO-APIC-level   eth1/n
Collectl output can also be saved in a rolling set of logs for later playback or displayed/ninteractively in a variety of formats. If all that isn't enough there are plugins that allow you to/nreport data in alternate formats or even send them over a socket to remote tools such as ganglia or/ngraphite. You can even create files in space-separated format for plotting with external packages/nlike gnuplot. The one below was created with colplot, part of the collectl utilities project, which provides a web-based/ninterface to gnuplot./n/n
/n /n
/n/n

Are you a big user of the top command? Have you ever wanted to look across a cluster to see/n what the top processes are? Better yet, how about using iostat across a cluster? Or maybe/n vmstat or even looking at top network interfaces across a cluster? Look no more because if/n collectl reports it for one node, colmux can do it across a cluster AND you can/n sort by any column of your choice by simply using the right/left arrow keys.

/n/n

Collectl and Colmux run on all linux distros and are available in redhat and debian/n respositories and so getting it may be as simple as running yum or apt-get. Note that since/n colmux has just been merged into the collectl V4.0.0 package it may not yet be available in the/n repository of your choice and you should install collectl-utils V4.8.2 or earlier to get it for the/n time being.

/n/n

Collectl requires perl which is usually installed by default on all major Linux distros and/n optionally uses Time::Hires which is also usually installed and/n allows collectl to use fractional intervals and display timestamps in msec. The Compress::Zlib module is usually/n installed as well and if present the recorded data will be compressed and therefore use on/n average 90% less storage when recording to a file.

/n/n

If you're still not sure if collectl is right for you, take a couple of minutes to look at/n the Collectl/n Tutorial to get a better feel for what collectl can do. Also be sure to check back and see/n what's new on the website, sign up for a Mailing List or watch the Forums .

/n/n
/n /n /n /n /n/n /n /n /n/n /n /n /n/n /n /n /n
"I absolutely love it and have been using it extensively for/n months."
Kevin Closson: Performance Architect, EMC
"Collectl is indispensable to any system admin."
Matt Heaton: President, Bluehost.com
/n
/n /n
/n/n

[Dec 07, 2015] Understanding Linux CPU stats

Let's take a step back. There are 3 general states your CPU can be in:

These three meta states can be further subdivided. For example, user space programs can be categorized as those running under their initial priority level or those running with a nice priority. Niceness is a way to tweak the priority level of a process so that it runs less frequently. The niceness level ranges from -20 (most favorable scheduling) to 19 (least favorable). By default processes on Linux are started with a niceness of 0. See our blog post Restricting process CPU usage using nice, cpulimit, and cgroups for more information on nice.

[Jun 27, 2010] Can You Top This 15 Practical Linux Top Command Examples

January 4, 2010 | http://www.thegeekstuff.com/
  1. Show Processes Sorted by any Top Output Column – Press O

    By default top command displays the processes in the order of CPU usage. When the top command is running, press M (upper-case) to display processes sorted by memory usage as shown below.

    To sort top output by any column, Press O (upper-case O) , which will display all the possible columns that you can sort by as shown below.

    When the linux top command is running, Press R, which does the sort in reverse order.

  2. Kill a Task Without Exiting From Top – Press k

    Once you've located a process that needs to be killed, press 'k' which will ask for the process id, and signal to send. If you have the privilege to kill that particular PID, it will get killed successfully.

  3. Renice a Unix Process Without Exiting From Top – Press r

    Press r, if you want to just change the priority of the process (and not kill the process). This will ask PID for renice, enter the PID and priority.

  4. Display Selected User in Top Output Using top -u
  5. Display Only Specific Process with Given PIDs Using top -p
  6. Display All CPUs / Cores in the Top Output – Press 1 (one)

    Top output by default shows CPU line for all the CPUs combined together as shown below.

  7. Refresh Unix Top Command Output On demand (or) Change Refresh Interval

    By default, linux top command updates the output every 3.0 seconds. When you want to update the output on-demand, press space bar.

  8. Highlight Running Processes in the Linux Top Command Output – Press z or b

    Press z or b, which will highlight all running process as shown below.

  9. Display Absolute Path of the Command and its Arguments – Press c
  10. Quit Top Command After a Specified Number of Iterations Using top -n
  11. Executing Unix Top Command in Batch Mode

    If you want to execute top command in the batch mode use option -b as shown below.

  12. Split Top Output into Multiple Panels – Press A
  13. Get Top Command Help from Command Line and Interactively
  14.   ..........
  15. Decrease Number of Processes Displayed in Top Output – Press n

UNIX 'Top' command

May 16, 2008 | The Joel on Software Discussion Group

Under 'Top' there are two columns: SIZE and RES

SIZE- refers to the virtual memory

RES- refers to the resident memory used in the RAM


It is ideal to ensure that RES value is as low as possible? And to keep the RES value far below the SIZE value?

Lotus

Friday, The general wisdom is to create your swap partition to be twice the amount of ram you have, up to about 512MB swap (at least I've never bothered making a larger swap for my desktop machine).

Keep in mind that Linux will try to keep RAM as full as it possible can, so it will appear that you're hurting for RAM when you're really doing ok, the kernel is just attempting to keep the system running as quickly as possible.

I have no idea about the behavior of other unices.

Fake Programmer:

Some stuff from 'man top':

VIRT -- Virtual Image (kb)
The total amount of virtual memory used by the task. It includes all code, data and shared libraries plus pages that have been swapped out.

VIRT = SWAP + RES.

SWAP -- Swapped size (kb)
The swapped out portion of a task's total virtual memory image.

RES -- Resident size (kb)
The non-swapped physical memory a task has used.

RES = CODE + DATA.

----
Btw I don't have a 'SIZE' column when I run top, so YMMV.

But I think if you're looking for memory efficiency then I'm reasonably sure you want to be able to reduce RES as much as possible, and try to have SWAP as close as possible to RES.

The lower RES is, the less memory your program will need, the more consistently you can have SWAP approaching RES the more of your program is available to be swapped out, thereby reducing the drain on the system's memory. No idea how easy it would be to do this though; think it would require a pretty tight control over the compilation to have the most used code bundled into the smallest number of pages.

No doubt I'll probably be shot down over some gross inaccuracy, but hopefully I'm in the right vicinity of what you're asking...

Graham Allan:

What is your real problem?

Are you a programmer asking how to write your program efficiently so it is not a memory hog, or a system administrator asking how to slow the system down by increasing swapping and paging so it looks like you have plenty of unused memory?

Because the latter is a really bad idea. As Fake Programmer said, most systems use "spare" memory for caching in order to run faster. Are you sure this is not what you are seeing? This memory can be instantly freed if required by an application.

That said, there are legitimate reasons for wanting to limit memory usage by processes. Perhaps one memory hog is "crowding out" another application. You may be able to do this using startup parameters of the program itself, with java vm's and databases for example, or the operating system may provide resource controls.

Recommended Links

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Reference

Linux Command Directory top

top [options]

Provide information (frequently refreshed) about the most CPU-intensive processes currently running. You do not need to include a - before options. See ps for explanations of the field descriptors.

Options

-b

Run in batch mode; don't accept command-line input. Useful for sending output to another command or to a file.

-c

Show command line in display instead of just command name.

-d delay

Specify delay between refreshes.

-f

Add or remove fields or columns.

-h

Print a help message and exit.

-i

Suppress display of idle and zombie processes. -i is a toggle; top starts with the last remembered setting.

-n num

Update display num times, then exit.

-p pid

Monitor only processes with the specified process ID.

-s

Secure mode. Disable some (dangerous) interactive commands.

-S

Cumulative mode. Print total CPU time of each process, including dead child processes.

-u user

Monitor only processes with the specified effective UID or username.

-U user

Monitor only processes with the specified UID or username, matching real, effective, saved, and filesystem ids.

-v

Print version information and exit.

Interactive commands

=

Remove restrictions on which tasks are shown. Reverses the effect of an active i or n command.

space, Enter

Update display immediately.

<, >

Move the sort field. Use < to move one column left and > to move one column to the right.

A

Toggle alternate display mode between a single window or multiple windows. See the following section Alternate display mode commands for the commands that work with A.

b

Toggle between bold and reverse display. Only works with x or y.

B

Globally toggle bold display.

c

Toggle display of command name or full command line.

d, s

Change delay between refreshes. Prompt for new delay time, which should be in seconds. Suppressed in secure mode.

f

Prompt to add fields to or remove fields from the display.

F, O

Select sort field.

G

Select another field group and make it current, or change by selecting a number from the following list:

1

Def

2

Job

3

Mem

4

Usr

h, ?

Display help about commands and the status of secure and cumulative modes.

I, 1

Toggle SMP view. Use I to toggle IRIX/Solaris mode, 1 to toggle single/separate states.

k

Prompt for process ID to kill, and signal to send (default is 15) to kill it.

i

Toggle suppression of idle and zombie processes.

l

Toggle display of load-average and uptime information.

m

Toggle display of memory information.

n, #

Prompt for maximum number of processes to show. If 0 is entered, show as many as will fit on the screen (default).

N

Sort numerically by process ID.

o

Prompt to change order of displayed fields.

P

Sort tasks by CPU usage (default).

q

Exit.

r

Apply renice to a process. Prompt for PID and renice value. Suppressed in secure mode.

R

Toggle normal or reverse sort.

S

Toggle cumulative mode. (See the -S option.)

t

Toggle display of processes and CPU states lines.

T

Sort tasks by time/cumulative time.

u

Prompt for specific user to show.

W

Write current setup to ~/.toprc. This is the recommended way to write a top configuration file.

x

Toggle highlighting for sort field.

y

Toggle highlights for running tests.

z

Toggle between color and mono display.

Z

Globally change color mappings.

Alternate display mode commands

=

Rebalance tasks in the current window.

+

Rebalance tasks in every window.

-

Show or hide the current window.

_

Show all invisible windows or hide all visible windows.

a

Cycle forward through all four windows.

g

Change the name of the current window or group.

w

Cycle backward through all four windows.

Field descriptions

The first five entries in the following list describe the lines that appear at the top of the top display. The rest are the fields that can be displayed for each task (sizes are in kilobytes). Use the interactive f command to add or remove fields.

top

Display the time the system has been up, the number of users, and three load averages consisting of the average number of processes ready to run in the last 1, 5, and 15 minutes.

Tasks

The total number of processes running when the last update was taken, shown as the number of running, sleeping, stopped, or undead tasks.

Cpu(s)

The percentage of CPU time spent in user mode, in system mode, on tasks with a negative nice value, and idle.

Mem

Memory statistics, including total available memory, free memory, memory used, shared memory, and memory used for buffers.

Swap

Swapspace statistics, including total, available, used, and cached.

PID

Process ID.

PPID

Parent process ID.

UID

Effective user ID of task's owner.

USER

Effective username of task's owner.

RUSER

Real username of task's owner.

GROUP

The effective group name of task's owner.

PR

Priority.

NI

Nice value.

nFLT

Page fault count.

CODE

Code size.

DATA

Data plus stack size.

RES

Resident task size.

SWAP

Size of swapped-out portion of task.

VIRT

The total amount of virtual memory used by the task.

nDRT

Size of pages marked dirty.

#C

Last-used processor, for multiprocessor systems.

SHR

Amount of shared memory used.

S

State of the task. Values are S (sleeping), D (uninterruptible sleep), R (running), Z (zombies), or T (stopped or traced), possibly followed by < (negative nice value), N (positive nice value), or W (swapped out).

WCHAN

Address or name of the kernel function in which the task is currently sleeping.

TIME

Total CPU time used by task and any children.

TIME+

Like TIME, but shows the time down to hundredths of a second.

%CPU

Share of CPU time since last update, as percentage of total CPU time.

%MEM

Share of physical memory.

TTY

Controlling tty.

COMMAND

Command line (truncated if too long) if task is in memory, or command name in parentheses if swapped out.

FLAGS

Task flags.

About top

Display Linux tasks.

Syntax

top -hv | -bcisS -d delay -n iterations -p pid [, pid ...]

The traditional switches '-' and whitespace are optional.

-b Batch mode operation
Starts top in 'Batch mode', which could be useful for sending output from top to other programs or to a file. In this mode, top will not accept input and runs until the iterations limit you've set with the '-n' command-line option or until killed.
-c Command line/Program name toggle
Starts top with the last remembered 'c' state reversed. Thus, if top was displaying command lines, now that field will show program names, and visa versa. See the 'c' interactive command for additional information.
-d Delay time interval as: -d ss.tt (seconds.tenths)
Specifies the delay between screen updates, and overrides the corresponding value in one's personal configuration file or the startup default. Later this can be changed with the 'd' or 's' interactive commands.

Fractional seconds are honored, but a negative number is not allowed. In all cases, however, such changes are prohibited if top is running in 'Secure mode', except for root (unless the 's' command-line option was used). For additional information on 'Secure mode' see topic 5a. SYSTEM Configuration File.

-h Help
Show library version and the usage prompt, then quit.
-i Idle Processes toggle
Starts top with the last remembered 'i' state reversed. When this toggle is Off, tasks that are idled or zombied will not be displayed.
-n Number of iterations limit as: -n number
Specifies the maximum number of iterations, or frames, top should produce before ending.
-u Monitor by user as: -u somebody
Monitor only processes with an effective UID or user name matching that given.
-U Monitor by user as: -U somebody
Monitor only processes with a UID or user name matching that given. This matches real, effective, saved, and filesystem UIDs.
-p Monitor PIDs as: -pN1 -pN2 ... or -pN1, N2 [,...]
Monitor only processes with specified process IDs. This option can be given up to 20 times, or you can provide a comma delimited list with up to 20 pids. Co-mingling both approaches is permitted.

This is a command-line option only. And should you wish to return to normal operation, it is not necessary to quit
and and restart top -- just issue the '=' interactive command.

-s Secure mode operation
Starts top with secure mode forced, even for root. This mode is far better controlled through the system configuration file (see topic 5. FILES).
-S Cumulative time mode toggle
Starts top with the last remembered 'S' state reversed. When 'Cumulative mode' is On, each process is listed with the cpu time that it and its dead children have used. See the 'S' interactive command for additional information regarding this mode.
-v Version
Show library version and the usage prompt, then quit.

Examples

When operating top, the two most important keys are help ('h' or '?') and quit ('q') key. Alternatively, you could simply use the traditional interrupt key ('^C') when you're done.

top

Running the above command would give you a display similar to the below example. While the tasks are being displayed you can use any of the startup commands listed after the below example output.

top - 20:50:55 up 167 days, 14:26, 82 users, load average: 0.13, 0.05, 0.01
Tasks: 3 total, 1 running, 2 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0% user, 2.2% system, 0.0% nice, 97.8% idle
Mem: 514964k total, 507860k used, 7104k free, 30404k buffers
Swap: 1630588k total, 158708k used, 1471880k free, 275380k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 
3747 hope 11 0 2004 1608 1608 S 0.3 0.3 0:00.56 sshd 
22245 hope 10 0 688 676 672 S 0.0 0.1 0:00.06 csh 
14015 hope 10 0 1024 1024 848 R 0.0 0.2 0:00.00 top

Startup Defaults
The following startup defaults assume no configuration file, thus no user customizations. Even so, items shown with an
asterisk ('*') could be overridden through the command-line.

A Alt display Off (full-screen)
* d Delay time 3.0 seconds
I Irix mode On (no, 'solaris' smp)
* p PID monitoring Off
* s Secure mode Off (unsecured)
B Bold disable Off
l Load Avg/Uptime On (thus program name)
t Task/Cpu states On (1+1 lines, see '1')
m Mem/Swap usage On (2 lines worth)
1 Single Cpu On (thus 1 line if smp)
b Bold hilite On (not 'reverse')
* c Command line Off (name, not cmdline)
* i Idle tasks On (show all tasks)
R Reverse sort On (pids high-to-low)
* S Cumulative time Off (no, dead children)
x Column hilite Off (no, sort field)
y Row hilite On (yes, running tasks)
z color/mono Off (no, colors)


Etc

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Bulletin:

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History:

Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds  : Larry Wall  : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOSProgramming Languages History : PL/1 : Simula 67 : C : History of GCC developmentScripting Languages : Perl history   : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history

Classic books:

The Peter Principle : Parkinson Law : 1984 : The Mythical Man-MonthHow to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Hater’s Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite

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The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D


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Last modified: February 19, 2020