Language Selection

English French German Italian Portuguese Spanish

How much power does KDE need?

Filed under
KDE

Honestly, I just love hacking while traveling by train - no IRC, no ICQ, no email that steals attention. However, most of the time I don't sit near a power supply socket so my laptop runs from battery. How much do you need for running KDE? I don't mean CPU or RAM ressources, but battery power. I know that you can enhance the battery lifetime by installing more RAM into your laptop - so that the hard disk has less work to do. But how much could you save by not running KDE ?

And I had time to figure out. I've fixed busy-looping in KDE-applications already in the past, but it seems there are new offenders added to our tree on a daily basis. Even if those busy-looping applications (with short timeouts) never appear as significant in the top output - they eat processing time.. and power. For my laptop, running KDE (not doing any user interaction) requires about 1.2 W/h. Thats 10%. With other words, I could hack about 10% longer if those are fixed. Thats a lot, so I started stracing to find the worst offenders. And the hitlist is:

  • artsd. No further comment necessary, its the first thing I kill (or don't even install) anyway.

  • kded (with dnotify it seems to busy-loop due to debug-output<->directory changed trigger loop)
  • klaptopdaemon. The code just does horrible stuff, including installing event listeners everywhere for no reason. Second thing to kill if you actually use a laptop.
  • kicker. One reason is the clock, which busy-loops even if nothing is to be expected to be done. But its doing a lot more, I haven't quite figured out yet what it does, but its definitely unnecessary as long as there is no user interaction.

Over the next few weeks I might try fixing those worst offenders. Any help with that is highly appreciated.

Source.

More in Tux Machines

Knoppix 7.4.1 Updated with New Linux Kernel and Multiple Fixes – Gallery

Knoppix 7.4.1, a bootable Live CD/DVD made up from the most popular and useful free and open source applications, backed up by automatic hardware detection and support for a large number of hardware devices, has been released and is now available for download. Read more

Hackable $39 Allwinner A20 SBC packs HDMI and GbE

The $39 hackable “pcDuino3Nano” SBC runs Android or Ubuntu on a dual-core Allwinner A20 SoC, and offers GbE, HDMI, and 3x USB, plus Arduino-style expansion. It appears we have a new price/performance standout in the open source single board computer game. Longmont, Colorado based LinkSprite Technologies, which hosts the open source project for Allwinner-based pcDuino SBCs, has just announced a $39 board with a set of features that would typically go for about $60. The pcDuino3Nano offers the same dual-core, 1GHz Cortex-A7 system-on-chip and all the other features of the $77 pcDuino3 SBC except for the LVDS interface, I2S stereo digital audio output, and built-in WiFi. It also adds a second USB 2.0 host port, and upgrades the LAN interface from 10/100 to 10/100/1000 Ethernet. Read more

New Video Series Teaches Kids About Linux

Growing up in rural Utah, brothers Jared and JR Neilsen spent their free time recording videos that starred a cast of homemade puppets. As adults they've reconvened to create their own web series,Hello World, which aims to teach kids about computer science. The latest segment in the series, “Superusers: The Legendary GNU/Linux Show,” is focused on teaching Linux fundamentals. Puppets Adelie the penguin and Aramis the gnu lead kids on operating system adventures to teach topics such as how to use commands, write basic shell scripts, and find a file or directory. “We wanted to do something creative and fun, merging the adventures of our youth with our current interests in computer science,” Jared Neilsen said, via email. “It's a pastiche of things we love: puppets, surreal British comedy, philosophy, music, superhero cartoons, and Linux, of course.” Read more

Google's Chrome Strategy Heads in New Directions, Draws Linux Comparisons

Google's Chrome browser and Chrome OS operating system are grabbing headlines this week for several reasons. As Susan reported here, Matt Hartley said recently, 'Anyone who believes Google isn't making a play for desktop users isn't paying attention.' Hartley favors putting Linux in front of a lot of potential Chrome OS users, and says "I consider ChromeOS to be a forked operating system that uses the Linux kernel under the hood." Read more