slmon(1) program for monitoring system's performance in realtime.


slmon [options]


SLmon is a tool for monitoring system's performance. It displays results using nice and (hopefully) readable text-based UI. Currently monitored are:

  • CPU load (SMP is supported)
  • network interfaces
  • memory (including swap)
  • uptime, date and time
  • number of logged in users
  • mounted filesystems
  • processes

SLmon uses glibtop version >= 2 and libslang version >= 1.2.2 (this version however has a bug that makes it impossible to write a character in lower right corner, but otherwise it works okay).

Starting with 0.5.13 Glib library is needed.


-v, --version
Display version and copying and exit
-h, --help
Display brief usage information
-f, --fs-unit=[kmg]
Specify filesystem usage unit, where: b=bytes, k=kbytes, m=mbytes, g=gbytes
-m, --mem-unit=[bkmg]
Specify memory usage unit, where: b=bytes, k=kbytes, m=mbytes, g=gbytes
-n, --net-unit=[bkmg]
Specify network traffic unit, where: b=bytes, k=kbytes, m=mbytes, g=gbytes
-d, --mode=[mpnh]
Start in mode 'M' where: m=main, p=process, n=network, h=histogram
-u, --update=<seconds>
Specify update interval in seconds

Configuration files

SLmon looks for the configuration file in the following locations:
if the previous one fails

Options can be specified in the form of pairs: <key> = <value>. Lines beginning with '#' are treated as comments (note: all leading whitespaces are stripped). All subsequent definitions of a certain option overwrite previous declarations except for the net_dev option.

Available options (more to come :)):

Start certain mode: m=main, p=process, n=network, h=histogram.
Specify memory usage unit [bkm].
Specify filesystem usage unit [kmg].
Specify network traffic unit [bkmg].
Add a network interface to list of monitored interfaces.
Specify update interval in seconds.


/etc/slmonrc ~/.slmonrc Files with user defined options


Copyright (C) 2000, 2001, 2002 Krzysztof Luks <[email protected]>.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.


slmon uses too much cpu time in process mode

Please send all bugreports to [email protected].


Krzysztof Luks <[email protected]>