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Systeminfo Binding

Robert van Bregt edited this page May 13, 2016 · 21 revisions


The System Information binding provides operating system monitoring data, including:

  • System memory, swap, CPU, load average, uptime
  • Per-process memory, CPU
  • File system metrics
  • Network interface metrics

The binding uses the Hyperic SIGAR API to access system information regardless of the underlying platform (Windows, Linux, OS X...).

For installation of the binding, please see Wiki page Bindings.

Generic Item Binding Configuration

In the openhab.cfg file (in the folder ${openhab_home}/configurations):

############################### Systeminfo Binding ####################################
# Interval in milliseconds when to find new refresh candidates
# (optional, defaults to 1000)

# Data Storage Unit, where B=Bytes, K=kB, M=MB, T=TB (optional, defaults to M)

# New as of 1.9:
# Alternative native library to load (required for ARM/Linux or custom, not required
# for standard platforms). Choices for ARM/Linux are cubian, odroid-u3 or raspbian.
# Results in loading library having the name [lib]sigar-<variant>[.so|.sl|.dll|.dylib]

Hyperic SIGAR Native libraries


As of version 1.9, the SIGAR native libraries for standard platforms (and cubian, odroid-u3 and raspbian ARM/Linux systems) are included and loaded automatically by the binding. To use a platform-specific native library that is not included in the binding JAR, place it in your ${openhabhome}/lib folder and make sure it is named as described above in the instructions for the systeminfo:variant configuration property.

1.8 and previous

The System Information binding does not include SIGAR native libraries currently. The platform-specific SIGAR native libraries can be found here for several platforms (see sigar-bin/lib folder). The pre-built libraries need to be moved into the ${openhabhome}/lib folder.

ARM-based devices (1.8 and previous)

ARM-based devices, such as Raspberry PI, require manual setup. See discussion.

There are 3 pre-compiled libraries:

The instructions below help you to install the library. The example uses raspbian and an apt-get installation of openHAB as an example, please modify to suit your needs.

Download raspbian library to your RPi:

$ wget -O ~/

Unzip archive:

$ unzip ~/ -d ~

Create a lib folder first for apt-get installations:

$ sudo mkdir /usr/share/openhab/lib

(If you run openHAB from one single folder, please find the path to lib yourself. Usually: {openhabhome}/lib).

Then copy the downloaded files to the new lib folder:

$ sudo cp ~/sigar-raspbian/lib/* /usr/share/openhab/lib

Remove temporary files:

$ rm -r ~/sigar-raspbian

If you do not want to keep the .zip file, remove it, too.

$ rm ~/

Done! Now install the binding and add your items.

Item Binding Configuration

In order to bind an item to the device, you need to provide configuration settings by adding some binding information in your item file (in the folder configurations/items). The syntax of the binding configuration strings accepted is the following:



<commandType> corresponds to the command type. See complete list below. Note that the output of some commands (eg. DirUsage) will be affected by filesystem permissions. ie. Directories that the process is not permitted access to cannot be include in the tally.

<refreshPeriod> corresponds to the update interval of the item in milliseconds.

<target> corresponds to the target of the command. Target field is mandatory only for commands, which need target. See further details from supported command list below.

List of supported commands (commandType)

Command Item Type Purpose Note
LoadAverage1Min Number
LoadAverage5Min Number
LoadAverage15Min Number
CpuCombined Number
CpuUser Number
CpuSystem Number
CpuNice Number
CpuWait Number
Uptime Number
UptimeFormatted String
MemFree Number
MemFreePercent Number
MemUsed Number
MemUsedPercent Number
MemActualFree Number
MemActualUsed Number
MemTotal Number
SwapFree Number
SwapTotal Number
SwapUsed Number
SwapPageIn Number
SwapPageOut Number
NetTxBytes Number target = net interface name (1
NetRxBytes Number target = net interface name (1
DiskReads Number target = disk name (2
DiskWrites Number target = disk name (2
DiskReadBytes Number target = disk name (2
DiskWriteBytes Number target = disk name (2
DirUsage Number target = directory path (if folder contains lot of files scan can take a while!)
DirFiles Number target = directory path (if folder contains lot of files scan can take a while!)
ProcessRealMem Number target = process name (3
ProcessVirtualMem Number target = process name (3
ProcessCpuPercent Number target = process name (3
ProcessCpuSystem Number target = process name (3
ProcessCpuUser Number target = process name (3
ProcessCpuTotal Number target = process name (3
ProcessUptime Number target = process name (3
ProcessUptimeFormatted String target = process name (3
ProcessCpuPercent Number target = process name (3

Since 1.7.0

Command Item Type Purpose Note
FileSystemUsed Number target = name of the directory on which filesystem is mounted
FileSystemFree Number target = name of the directory on which filesystem is mounted
FileSystemTotal Number target = name of the directory on which filesystem is mounted
FileSystemUsagePercent Number target = name of the directory on which filesystem is mounted
FileSystemFiles Number target = name of the directory on which filesystem is mounted
FileSystemFreeFiles Number target = name of the directory on which filesystem is mounted

(1 interface name: Check supported interface names by ifconfig, ipconfig or openhab debug log E.g. "21:56:12.930 DEBUG o.o.b.s.internal.SysteminfoBinding[- valid net interfaces: lo0, en0, en1, p2p0, vboxnet0

(2 disk name: Check supported disk names by iostat or openhab debug log "21:56:12.931 DEBUG o.o.b.s.internal.SysteminfoBinding[- valid disk names: /dev/disk0s2"

(3 process name supports:

Usage Example Explanatory
$$ $$ current process
processname eclipse process name contains "eclipse"
`**`processname `**`eclipse process name ends to "eclipse"
processname`**` eclipse`**` process name start with "eclipse"
=processname =eclipse process name equals "eclipse"
#PTQL #State.Name.eq=eclipse Sigar Process Table Query Language (see

Examples, how to configure your items:

Group System
Number loadAverage1min  "Load avg. 1min [%.1f]" (System) { systeminfo="LoadAverage1Min:5000" }
Number loadAverage5min  "Load avg. 5min [%.1f]" (System) { systeminfo="LoadAverage5Min:5000" }
Number loadAverage15min "Load avg. 15min [%.1f]"    (System) { systeminfo="LoadAverage15Min:5000" }

Number cpuCombined  "CPU combined [%.1f]"   (System) { systeminfo="CpuCombined:5000" }
Number cpuUser  "CPU user [%.1f]"   (System) { systeminfo="CpuUser:5000" }
Number cpuSystem    "CPU system [%.1f]" (System) { systeminfo="CpuSystem:5000" }
Number cpuNice  "CPU nice [%.1f]"   (System) { systeminfo="CpuNice:5000" }
Number cpuWait "CPU wait [%.1f]"    (System) { systeminfo="CpuWait:5000" }

Number uptime   "Uptime [%.1f]" (System) { systeminfo="Uptime:5000" }
String uptimeFormatted  "Uptime [%s]" (System) { systeminfo="UptimeFormatted:5000" }

Number memFreePercentPeriod "MemFree chart selected [%.1f]" (System)
Number memFreePercent   	"Mem free [%.1f%%]" (System) { systeminfo="MemFreePercent:5000" }
Number memUsed  			"Mem used [%.1f]"   (System) { systeminfo="MemUsed:5000" }
Number memUsedPercent   	"Mem used [%.1f%%]" (System) { systeminfo="MemUsedPercent:5000" }
Number memActualFree    	"Mem actual free [%.1f]"    (System) { systeminfo="MemActualFree:5000" }
Number memActualUsed    	"Mem actual used [%.1f]"    (System) { systeminfo="MemActualUsed:5000" }
Number memTotal 			"Mem total [%.1f]"  (System) { systeminfo="MemTotal:5000" }

Number swapFree "Swap free [%.1f]"  (System) { systeminfo="SwapFree:5000" }
Number swapTotal    "Swap total [%.1f]" (System) { systeminfo="SwapTotal:5000" }
Number swapUsed "Swap used [%.1f]"  (System) { systeminfo="SwapUsed:5000" }
Number swapPageIn   "Swap pagein [%.1f]"    (System) { systeminfo="SwapPageIn:5000" }
Number swapPageOut  "Swap pageout [%.1f]"   (System) { systeminfo="SwapPageOut:5000" }

Number netTxBytes   "Next tx bytes [%.1f]"  (System) { systeminfo="NetTxBytes:5000:en1" }
Number netRxBytes   "Next rx bytes [%.1f]"  (System) { systeminfo="NetRxBytes:5000:en1" }

Number diskReads    "Disk reads [%.1f]" (System) { systeminfo="DiskReads:5000:/dev/disk1" }
Number diskWrites   "Disk writes [%.1f]"    (System) { systeminfo="DiskWrites:5000:/dev/disk1" }
Number diskReadBytes    "Disk read bytes [%.1f]"    (System) { systeminfo="DiskReadBytes:5000:/dev/disk1" }
Number diskWriteBytes   "Disk write bytes [%.1f]"   (System) { systeminfo="DiskWriteBytes:5000:/dev/disk1" }

Number dirUsage "Dir usage [%.1f]"  (System) { systeminfo="DirUsage:5000:/Users/foo" }
Number dirFiles "Dir files [%.1f]"  (System) { systeminfo="DirFiles:5000:/Users/foo" }

Number openhabRealMem   "Real mem [%.1f]"   (System) { systeminfo="ProcessRealMem:5000:$$" }
Number openhabVirtualMem    "Virtual mem [%.1f]"    (System) { systeminfo="ProcessVirtualMem:5000:$$" }
Number openhabCpuPercent    "Cpu percent [%.1f%%]"  (System) { systeminfo="ProcessCpuPercent:5000:$$" }
Number openhabCpuSystem "CPU system [%.1f]" (System) { systeminfo="ProcessCpuSystem:5000:$$" }
Number openhabCpuUser   "CPU user [%.1f]"   (System) { systeminfo="ProcessCpuUser:5000:$$" }
Number openhabCpuTotal  "CPU total [%.1f]"  (System) { systeminfo="ProcessCpuTotal:5000:$$" }
Number openhabUptime    "Uptime [%d]"   (System) { systeminfo="ProcessUptime:5000:$$" }
String openhabUptimeFormatted   "Uptime form. [%s]" (System) { systeminfo="ProcessUptimeFormatted:5000:$$" }

Number eclipseRealMem1  "Real mem1 [%.1f%%]"  (System) { systeminfo="ProcessCpuPercent:10000:eclipse" }
Number eclipseRealMem2  "Real mem2 [%.1f%%]"  (System) { systeminfo="ProcessCpuPercent:10000:*eclipse" }
Number eclipseRealMem3  "Real mem3 [%.1f%%]"  (System)  { systeminfo="ProcessCpuPercent:10000:eclipse*" }
Number eclipseRealMem4  "Real mem4 [%.1f%%]"  (System) { systeminfo="ProcessCpuPercent:10000:=eclipse" }
Number eclipseRealMem5  "Real mem5 [%.1f%%]"  (System) { systeminfo="ProcessCpuPercent:10000:#State.Name.eq=eclipse" }

Examples, how to configure your sitemap:

Frame {
	Group item=System label="System Info" icon="system" {
		Frame {
			Text item=uptime
			Text item=cpuCombined icon="system"
		Frame label="Load" {
			Text item=loadAverage1min
			Text item=loadAverage5min
			Text item=loadAverage15min
		Frame label="Memory" {
			Text item=memFreePercent  {
				Frame {
					Switch item=memFreePercentPeriod label="Periode" mappings=[0="Time", 1="Dag", 2="Uke"]
					Chart item=memFreePercent period=h refresh=30000 visibility=[memFreePercentPeriod==0, memFreePercentPeriod=="Uninitialized"]
					Chart item=memFreePercent period=D refresh=30000 visibility=[memFreePercentPeriod==1]
					Chart item=memFreePercent period=W refresh=30000 visibility=[memFreePercentPeriod==2]
			Text item=memUsed 
			Text item=memUsedPercent
			Text item=memActualFree 
			Text item=memActualUsed 
			Text item=memTotal 
		Frame label="Swap" {
			Text item=swapFree 
			Text item=swapTotal
			Text item=swapUsed 
		Frame label="Openhab" {
			Text item=openhabRealMem
			Text item=openhabVirtualMem
			Text item=openhabCpuPercent
			Text item=openhabCpuSystem
			Text item=openhabUptime
			Text item=openhabUptimeFormatted


System information can be extended in multiple ways.

Raspberry Pi

The Raspberry Pi provides the vcgencmd command. More information about vcgencmd usage can be found on the Internet.

A good and working example is to read the temperatures.

feature overview


Setup intro

Linux and OS X





User Interfaces



(link to openHAB forum)



Application Integration



A good source of inspiration and tips from users gathered over the years. Be aware that things may have changed since they were written and some examples might not work correctly.

Please update the wiki if you do come across any out of date information.

Binding configurations

Use case examples

Item definition examples

Sitemap definition examples

Collections of Rules on a single page

Single Rules


Syntax highlighting for external editors

Release Notes

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