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CPU, RAM, and load monitor for use with tmux


A simple, lightweight program provided for system monitoring in the status line of tmux.

The memory monitor displays the used and available memory.

The CPU usage monitor outputs a percent CPU usage over all processors. It also displays a textual bar graph of the current percent usage.

The system load average is also displayed.

Example output:

2885/7987MB [|||||     ]  51.2% 2.11 2.35 2.44

 ^    ^          ^         ^     ^    ^    ^
 |    |          |         |     |    |    |
 1    2          3         4     5    6    7
  1. Currently used memory.
  2. Available memory.
  3. CPU usage bar graph.
  4. CPU usage percentage.
  5. Load average for the past minute.
  6. Load average for the past 5 minutes.
  7. Load average for the past 15 minutes.

For terminals with 256 color support, graded colors can be displayed by passing the --colors flag.



Currently, Linux, Mac OSX, FreeBSD, OpenBSD, and NetBSD are supported.


  • >= CMake -3.5
  • C++ compiler with C++11 support (e.g. gcc/g++ >= 4.6)


There are links to the source code at the project homepage.


cd <source dir>
cmake .


su -
make install

Build and Install Using tpm

Include the plugin in your .tmux.conf, the same file you'll set the configuration in, below.

set -g @plugin 'thewtex/tmux-mem-cpu-load'

Install with Package Managers

  • Gentoo: emerge tmux-mem-cpu-load
  • Homebrew: brew install tmux-mem-cpu-load

Build and Install Using Antigen

Include the bundle in your .zshrc

antigen bundle thewtex/tmux-mem-cpu-load

Configuring tmux

Edit $HOME/.tmux.conf to display the program's output in status-left or status-right. For example:

set -g status-interval 2
set -g status-left "#S #[fg=green,bg=black]#(tmux-mem-cpu-load --colors --interval 2)#[default]"
set -g status-left-length 60

If you installed using tpm, you must specify the full path to the tmux-mem-cpu-load script, like below:

set -g status-right "#[fg=green]#($TMUX_PLUGIN_MANAGER_PATH/tmux-mem-cpu-load/tmux-mem-cpu-load --colors --powerline-right --interval 2)#[default]"

Note that the interval argument to tmux-mem-cpu-load should be the same number of seconds that status-interval is set at.

Another optional argument is the number of bars in the bar graph, which defaults to 10. This can, for instance, be set to the number of cores in a multi-core system.

The colors option will add graded colors for each of the measures.

The full usage:

Usage: tmux-mem-cpu-load [OPTIONS]

Available options:
-h, --help
         Prints this help message
-c, --colors
        Use tmux colors in output
-p, --powerline-left
        Use powerline left symbols throughout the output, enables --colors
-q, --powerline-right
        Use powerline right symbols throughout the output, enables --colors
-i <value>, --interval <value>
        Set tmux status refresh interval in seconds. Default: 1 second
-g <value>, --graph-lines <value>
        Set how many lines should be drawn in a graph. Default: 10
-m <value>, --mem-mode <value>
      Set memory display mode. 0: Default, 1: Free memory, 2: Usage percent.
-t <value>, --cpu-mode <value>
      Set cpu % display mode. 0: Default max 100%, 1: Max 100% * number of threads.
-a <value>, --averages-count <value>
      Set how many load-averages should be drawn. Default: 3


Matt McCormick (thewtex) <>

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