https://lms.onnocenter.or.id/wiki/index.php?action=history&feed=atom&title=How_to_measure_power_consumption 2026-04-22T00:16:39Z Revision history for this page on the wiki MediaWiki 1.45.1 https://lms.onnocenter.or.id/wiki/index.php?title=How_to_measure_power_consumption&diff=39439&oldid=prev 2014-01-20T10:41:10Z

<p>New page: Sumber: http://www.thinkwiki.org/wiki/How_to_measure_power_consumption ==Direct measurement during operation== To monitor the laptop&#039;s power consumption while it is running, unplug the AC...</p> <p><b>New page</b></p><div>Sumber: http://www.thinkwiki.org/wiki/How_to_measure_power_consumption<br /> <br /> ==Direct measurement during operation==<br /> To monitor the laptop&#039;s power consumption while it is running, unplug the AC power and run:<br /> :{{cmdroot|watch -n1 &#039;cat /proc/acpi/battery/BAT0/*&#039;}}<br /> <br /> This requires ACPI to be enabled. The value given is (roughly) an averge over the last minute.<br /> <br /> Alternatively, load the [[tp_smapi]] module and run the following with AC power unplugged:<br /> :{{cmdroot|watch -n1 &#039;cat /sys/devices/platform/smapi/BAT0/power_now&#039;}}<br /> or<br /> :{{cmdroot|watch -n1 &#039;cat /sys/devices/platform/smapi/BAT0/power_avg&#039;}}<br /> <br /> The former provides the instantaneous power draw, and the latter is (roughly) an average over the last minute. It&#039;s OK to use [[tp_smapi]]&#039;s &lt;tt&gt;force_discharge&lt;/tt&gt; function instead of physically disconnecting AC power.<br /> <br /> Note that running on battery power may activate power-saving mechanisms, so unless you take care to deactivate them this does not reflect power consumption under AC power.<br /> <br /> Dstat is another way to track your laptop&#039;s power consumption, run the following with AC power unplugged to relate power usage (in Watts) and battery information:<br /> <br /> [dag@moria ~]$ dstat --time --power --battery --battery-remain 10<br /> ----system---- power batt remai<br /> time |usage|bat0| bat0<br /> 15-06 08:53:55|0.000| 94| 4h29<br /> 15-06 08:54:05|15.74| 94| 4h30<br /> 15-06 08:54:15|15.56| 94| 4h30<br /> 15-06 08:54:25|15.52| 94| 4h30<br /> 15-06 08:54:35|15.60| 93| 4h29<br /> <br /> ==Measurement script==<br /> See [[Script_for_monitoring_power_consumption]].<br /> <br /> ==Measurement for synthetic workloads==<br /> Use the [http://bltk.sourceforge.net Battery Life Tool Kit] tool.<br /> <br /> ==Measurement during suspend==<br /> To measure power consumption while the laptop is suspended, use the [[ACPI sleep power drain test script]].<br /> <br /> ==Hardware-measurement on line or ac-adapter==<br /> The best (imho) method to measure power consumption is to measure the power drawn by the laptop from the ac-adapter or the power drawn by the ac-adapter itself by a wattmeter. If you want to measure drawn only by the laptop itself, you&#039;ll have to build a little adapter.<br /> <br /> ==See also==<br /> For reducing power consumption, see [[How to reduce power consumption]].</div>

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