用于检索linux中内置设备的功耗数据的接口或API

Question

I need to write a power, temperature monitor system for linux system. It needs display some power statistics for for some or all builtin-devices as what powerTop does.I have searched quite a bit and I'm still clueless. Could some one give me a guidance.

Answer 1

For measuring the temperature you might use the lm_sensors tool. For power consumption take a look at the acpi client . Both should be available for most distributions.

You can use these tools to determine the required values and display them in your software.

Example output of lm_sensors:

pc87366-isa-6620
Adapter: ISA adapter
VCORE:       +2.01 V  (min =  +1.90 V, max =  +2.10 V)
VCC:         +4.99 V  (min =  +0.00 V, max =  +6.03 V)
VPWR:       +11.88 V  (min =  +5.93 V, max = +28.02 V)
+12V:       +11.93 V  (min = +11.02 V, max = +13.01 V)
-12V:       -12.19 V  (min = -13.10 V, max = -11.06 V)
GND:         +0.00 V  (min =  +0.00 V, max =  +0.00 V)
Vsb:         +3.28 V  (min =  +3.00 V, max =  +3.59 V)
Vdd:         +3.28 V  (min =  +3.00 V, max =  +3.59 V)
Vbat:        +3.01 V  (min =  +2.40 V, max =  +3.01 V)
AVdd:        +3.26 V  (min =  +3.00 V, max =  +3.59 V)
Temp:        +55.0°C  (low  =  +0.0°C, high = +70.0°C)  
                      (crit = +85.0°C)

If you do not get certain values you might have to tweak your configuration. Look at the following locations (text has been taken from the man page):

 /etc/sensors3.conf /etc/sensors.conf The system-wide libsensors(3) configuration file. /etc/sensors3.conf is tried first, and if it doesn't exist, /etc/sensors.conf is used instead. /etc/sensors.d A directory where you can put additional libsensors configuration files. Files found in this directory will be processed in alphabetical order after the default configura‐ tion file. Files with names that start with a dot are ignored. 

Answer 2

If you want to write something completely on your own you may have a look at ACPI , which features are provided via sysfs .

ls /sys/power

should give you a first look at the information exported.