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htop
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htop - an interactive process viewer
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Arnavion 81b64691a7 Move sysfs-reading code to LinuxProcessList.c and add average frequency. 
This way the frequency is read from sysfs only once per update cycle
instead of every time the UI is redrawn.

This also changes the code to read from /proc/cpuinfo instead. This is because
reading from scaling_cur_freq stalls for 10ms if the previous read for the file
was more than one second ago. [1] Since htop's update cycle is
longer than that, it would cause the read of each CPU's scaling_cur_freq file
to block the UI for 20ms. This easily led to a noticeable half-second lag on
a 20+ CPU machine.

/proc/cpuinfo also has a 10ms delay, but this applies for the whole file
so the delay does not scale with the number of CPUs. [2]

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4815d3c56d1e10449a44089a47544d9ba84fad0d
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7d5905dc14a87805a59f3c5bf70173aac2bb18f8
 		2019-08-10 22:19:32 -07:00
darwin Show N/A on unsupported platforms instead of 0KHz 2019-08-10 17:17:45 -07:00
dragonflybsd Show N/A on unsupported platforms instead of 0KHz 2019-08-10 17:17:45 -07:00
freebsd Show N/A on unsupported platforms instead of 0KHz 2019-08-10 17:17:45 -07:00
linux Move sysfs-reading code to LinuxProcessList.c and add average frequency. 2019-08-10 22:19:32 -07:00
openbsd Show N/A on unsupported platforms instead of 0KHz 2019-08-10 17:17:45 -07:00
scripts Linting changes 2019-02-10 14:16:46 +01:00
solaris Show N/A on unsupported platforms instead of 0KHz 2019-08-10 17:17:45 -07:00
unsupported Show N/A on unsupported platforms instead of 0KHz 2019-08-10 17:17:45 -07:00
.editorconfig add editorconfig file to give hints to editors 2015-10-05 11:13:17 +02:00
.gitignore Unstage/gitignore INSTALL since it's regenerated by autogen.sh 2018-06-13 00:36:05 -03:00
.travis.yml travis-ci should really detect autogen.sh... 2015-11-19 13:14:20 -02:00
AUTHORS Initial import. 2006-03-04 18:16:49 +00:00
Action.c Fix virtualization color in help screen 2018-06-13 00:47:08 -03:00
Action.h Auto-follow process after a search. 2016-05-05 10:30:06 -03:00
Affinity.c Portable affinity using hwloc 2016-02-14 19:57:29 -02:00
Affinity.h Portable affinity using hwloc 2016-02-14 19:57:29 -02:00
AffinityPanel.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
AffinityPanel.h Sorry about the mega-patch. 2015-01-21 23:27:31 -02:00
AvailableColumnsPanel.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
AvailableColumnsPanel.h Sorry about the mega-patch. 2015-01-21 23:27:31 -02:00
AvailableMetersPanel.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
AvailableMetersPanel.h Sorry about the mega-patch. 2015-01-21 23:27:31 -02:00
BatteryMeter.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
BatteryMeter.h Move platform-dependent parts of Linux battery meter. 2014-11-27 21:04:57 -02:00
CONTRIBUTING.md Add Contributing Guide! 2018-02-26 11:45:53 -03:00
COPYING Resolve license incompatibility issues, 2010-02-24 21:13:45 +00:00
CPUMeter.c Move sysfs-reading code to LinuxProcessList.c and add average frequency. 2019-08-10 22:19:32 -07:00
CPUMeter.h Add new display option to also show CPU frequency in CPU meters. 2019-08-09 21:34:48 -07:00
CRT.c Fix color behavior on some terminals. 2018-02-05 07:20:27 +01:00
CRT.h Fix color behavior on some terminals. 2018-02-05 07:20:27 +01:00
CategoriesPanel.c Mark some things as const 2017-07-22 22:34:30 -05:00
CategoriesPanel.h Sorry about the mega-patch. 2015-01-21 23:27:31 -02:00
ChangeLog Update ChangeLog 2018-04-10 10:42:46 -03:00
CheckItem.c Avoid future confusions with how default values are set. 2015-08-12 17:29:32 -03:00
CheckItem.h Avoid future confusions with how default values are set. 2015-08-12 17:29:32 -03:00
ClockMeter.c Rename Meter.setValues() functions to updateValues() 2016-05-04 13:39:26 +08:00
ClockMeter.h Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers. 2012-12-05 15:12:20 +00:00
ColorsPanel.c Fix color behavior on some terminals. 2018-02-05 07:20:27 +01:00
ColorsPanel.h Make the implementation of color schemes declarative. 2015-02-03 22:30:05 +01:00
ColumnsPanel.c fix fallthough comments for GCC 7.x 2017-10-23 14:27:33 -04:00
ColumnsPanel.h Sorry about the mega-patch. 2015-01-21 23:27:31 -02:00
DisplayOptionsPanel.c Add a display option to hide CPU usage number from CPU meter. 2019-08-10 11:20:21 -07:00
DisplayOptionsPanel.h Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers. 2012-12-05 15:12:20 +00:00
EnvScreen.c Security review: make privilege dropping-restoring optional. 2017-07-26 15:40:55 -03:00
EnvScreen.h refactor *Screen classes, add InfoScreen superclass 2016-01-12 06:00:58 -02:00
FunctionBar.c Mark some things as const 2017-07-22 22:34:30 -05:00
FunctionBar.h Mark some things as const 2017-07-22 22:34:30 -05:00
Hashtable.c Check for failure in allocations. 2016-02-02 15:53:02 +01:00
Hashtable.h major header cleanup 2011-12-26 21:35:57 +00:00
Header.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
Header.h Fix macro Header_forEachColumn 2016-05-07 14:57:51 +08:00
HostnameMeter.c Rename Meter.setValues() functions to updateValues() 2016-05-04 13:39:26 +08:00
HostnameMeter.h Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers. 2012-12-05 15:12:20 +00:00
IncSet.c Mark some things as const 2017-07-22 22:34:30 -05:00
IncSet.h Auto-follow process after a search. 2016-05-05 10:30:06 -03:00
InfoScreen.c Replace size_t with int/void* union 2018-02-18 10:38:49 -03:00
InfoScreen.h refactor *Screen classes, add InfoScreen superclass 2016-01-12 06:00:58 -02:00
ListItem.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
ListItem.h Sorry about the mega-patch. 2015-01-21 23:27:31 -02:00
LoadAverageMeter.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
LoadAverageMeter.h Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers. 2012-12-05 15:12:20 +00:00
MainPanel.c Replace size_t with int/void* union 2018-02-18 10:38:49 -03:00
MainPanel.h Replace size_t with int/void* union 2018-02-18 10:38:49 -03:00
Makefile.am Disable 'make dist' when pkg.m4 is unused in configure 2018-05-22 23:21:42 -03:00
MemoryMeter.c Rename Meter.setValues() functions to updateValues() 2016-05-04 13:39:26 +08:00
MemoryMeter.h Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers. 2012-12-05 15:12:20 +00:00
Meter.c Fix out-of-bounds read 2018-02-18 10:17:56 -03:00
Meter.h Rename Meter.setValues() functions to updateValues() 2016-05-04 13:39:26 +08:00
MetersPanel.c fix fallthough comments for GCC 7.x 2017-10-23 14:27:33 -04:00
MetersPanel.h Mouse-friendly functions bar for meters panel 2016-07-16 21:13:46 +08:00
NEWS cleanup old stuff 2011-11-21 02:58:34 +00:00
Object.c Check for failure in allocations. 2016-02-02 15:53:02 +01:00
Object.h Check for failure in allocations. 2016-02-02 15:53:02 +01:00
OpenFilesScreen.c Use fork/exec instead of popen to run lsof (#757) 2018-03-16 11:39:03 -03:00
OpenFilesScreen.h refactor *Screen classes, add InfoScreen superclass 2016-01-12 06:00:58 -02:00
Panel.c Handle unexpected values for character passed to isalnum 2018-02-05 10:59:20 +01:00
Panel.h Added Ctrl+A and Ctrl+E to go to beginning and end of line. 2016-06-15 12:45:23 -03:00
Process.c Return of snprintf is not the number of written bytes 2019-02-10 14:16:46 +01:00
Process.h Collapse current subtree pressing Backspace 2018-04-05 19:38:13 -03:00
ProcessList.c Collapse current subtree pressing Backspace 2018-04-05 19:38:13 -03:00
ProcessList.h Portable affinity using hwloc 2016-02-14 19:57:29 -02:00
README Point users to the official release tarballs. 2016-08-23 15:43:27 -03:00
README.md Add README.md for Github 2014-02-03 09:11:39 -02:00
RichString.c Protect against overflows in RichString_setAttrn 2018-02-26 11:05:12 -03:00
RichString.h Protect against overflows in RichString_setAttrn 2018-02-26 11:05:12 -03:00
ScreenManager.c Remove duplicated if condition 2019-02-10 14:16:46 +01:00
ScreenManager.h Move FunctionBar inside Panel 2015-03-23 15:26:56 -03:00
Settings.c Add a display option to hide CPU usage number from CPU meter. 2019-08-10 11:20:21 -07:00
Settings.h Add a display option to hide CPU usage number from CPU meter. 2019-08-10 11:20:21 -07:00
SignalsPanel.c Fix overflow for signals >= 100. 2018-03-25 15:15:37 -03:00
SignalsPanel.h Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers. 2012-12-05 15:12:20 +00:00
StringUtils.c free(NULL) is a valid no-op, so let's make String_freeArray(NULL) valid too. 2016-08-24 18:12:35 -03:00
StringUtils.h Optimize Strings_startWith() 2016-08-11 10:49:35 +08:00
SwapMeter.c Rename Meter.setValues() functions to updateValues() 2016-05-04 13:39:26 +08:00
SwapMeter.h use dynamic units for text display 2015-08-27 06:13:27 +02:00
TESTPLAN Fix failing stuff. 2015-04-09 15:56:43 -03:00
TasksMeter.c htop scans /proc to determine how many running tasks exist. Since that 2018-01-23 14:11:47 -02:00
TasksMeter.h Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers. 2012-12-05 15:12:20 +00:00
TraceScreen.c strace: increase string length 2018-03-25 15:14:04 -03:00
TraceScreen.h refactor *Screen classes, add InfoScreen superclass 2016-01-12 06:00:58 -02:00
UptimeMeter.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
UptimeMeter.h Move UptimeMeter back into cross-platform code. 2014-11-27 19:34:47 -02:00
UsersTable.c Check for failure in allocations. 2016-02-02 15:53:02 +01:00
UsersTable.h major header cleanup 2011-12-26 21:35:57 +00:00
Vector.c Optimize Vector_size on non-debug builds 2018-02-05 11:01:35 +01:00
Vector.h Optimize Vector_size on non-debug builds 2018-02-05 11:01:35 +01:00
XAlloc.c Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
XAlloc.h Security review: check results of snprintf. 2017-07-27 16:07:50 -03:00
autogen.sh Simplify autogen.sh 2016-02-14 22:36:40 +01:00
configure.ac Disable 'make dist' when pkg.m4 is unused in configure 2018-05-22 23:21:42 -03:00
htop.1.in Mention the "c" key (tag subtree) in the man 2018-06-02 18:22:56 -03:00
htop.c htop.c: remove unused "--io" / "-i" (#811) 2019-02-10 14:16:46 +01:00
htop.desktop Improve Catalan translation for desktop file (#828) 2018-08-24 17:10:09 -03:00
htop.h Sorry about the mega-patch. 2015-01-21 23:27:31 -02:00
htop.png Updated icon! 2014-04-09 14:47:58 -03:00
test_spec.lua Fix typos, by @Gelma. 2016-08-30 12:37:31 -03:00

README.md

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htop

by Hisham Muhammad hisham@gobolinux.org (2004 - 2016)

Introduction

This is htop, an interactive process viewer. It requires ncurses. It is developed primarily on Linux, but we also have code for running under FreeBSD and Mac OS X (help and testing are wanted for these platforms!)

This software has evolved considerably over the years, and is reasonably complete, but there is always room for improvement.

Comparison between htop and classic top

  • In htop you can scroll the list vertically and horizontally to see all processes and full command lines.
  • In top you are subject to a delay for each unassigned key you press (especially annoying when multi-key escape sequences are triggered by accident).
  • htop starts faster (top seems to collect data for a while before displaying anything).
  • In htop you don't need to type the process number to kill a process, in top you do.
  • In htop you don't need to type the process number or the priority value to renice a process, in top you do.
  • In htop you can kill multiple processes at once.
  • top is older, hence, more tested.

Compilation instructions

This program is distributed as a standard autotools-based package. See the INSTALL file for detailed instructions.

When compiling from a release tarball, run:

./configure && make

For compiling sources downloaded from the Git repository, run:

./autogen.sh && ./configure && make

By default make install will install into /usr/local, for changing the path use ./configure --prefix=/some/path.

See the manual page (man htop) or the on-line help ('F1' or 'h' inside htop) for a list of supported key commands.

If not all keys work check your curses configuration.

License

GNU General Public License, version 2 (GPL-2.0)