Granola: Free, light, unobtrusive power-saving software for Windows and Linux

Discussion in 'Offtopic Discussions' started by Blue Protoman, Sep 17, 2011.

  1. Blue Protoman

    Blue Protoman Well-Known Member

    Joined:
    Mar 6, 2010
    Messages:
    4,119
    http://grano.la/


    Thought it'd be worth checking out. Granola dynamically adjusts the power your computer uses so it draws only what it needs. You save almost 40% of CPU energy by just letting the damn thing run in the background! Your computer thus draws less energy, thus improving its friendliness towards the earth. It doesn't affect performance, either. On top of that, it tells you how much money, carbon, and power you've saved. And since it slows power consumption, it stands to reason that it would extend battery life on laptops. This is absolutely the case; people report an extra hour or so on their laptops. Did I mention that it's free? This is one of those things that you have no reason not to get.
     
    Tags:
  2. demonstar3

    demonstar3 Still Fresh

    Joined:
    Dec 10, 2010
    Messages:
    49
    thanks looks pretty cool
     
    Last edited by a moderator: Sep 17, 2011
  3. Wrath Of Khan

    Wrath Of Khan Soul soother...

    Joined:
    Dec 29, 2009
    Messages:
    5,139
    Location:
    Ireland
    Would it have to be pnd,d. Granola is the nameof a muesli cereal too. And theres a hemp variety too.[​IMG]
     
  4. DaMummy

    DaMummy Soldier Paste

    Joined:
    Nov 5, 2009
    Messages:
    4,417
    Location:
    Ohio
    i have the sudden urge for hemp cereal...
     
  5. Wrath Of Khan

    Wrath Of Khan Soul soother...

    Joined:
    Dec 29, 2009
    Messages:
    5,139
    Location:
    Ireland
    You and Woody Harrelson :rolleyes:
     
  6. Hoodoo

    Hoodoo Member

    Joined:
    Jul 11, 2011
    Messages:
    350
    Location:
    Moscow, Russia
    Do not want. EULAs give me headaches.
     
  7. Coldbird

    Coldbird Member

    Joined:
    Aug 15, 2010
    Messages:
    398
    Gave it a try... lets see if I see a miracle on my next electricity bill but I somewhat doubt it...


    If it does then hell yes I will keep using it.
     
  8. Cloudef

    Cloudef Member

    Joined:
    Dec 30, 2009
    Messages:
    460
    Location:
    Gensokyo
    Seems quite dodgy application, I'll keep my powertop, lightweight setup, kernel settings and custom schedulers.
     
  9. Blue Protoman

    Blue Protoman Well-Known Member

    Joined:
    Mar 6, 2010
    Messages:
    4,119
    The idea is long-term savings. And remember that obviously the more computers you own, the more this will benefit you.

    I use it myself, and it's fine. On my netbook I can safely confirm the extra battery life.
     
    Last edited by a moderator: Sep 17, 2011
  10. god_at_hell

    god_at_hell Certified Guru

    Joined:
    Jan 5, 2004
    Messages:
    290
    Location:
    Aachen - Germany
    I do not see the advantages over normal speedstep/powernow with an ondemand governor. The governor will adjust the processor speed in respect to the system needs too.
     
  11. Blue Protoman

    Blue Protoman Well-Known Member

    Joined:
    Mar 6, 2010
    Messages:
    4,119
    When it's back up, check the site to see how it works.
     
  12. Alec

    Alec Member

    Joined:
    Mar 5, 2009
    Messages:
    431
    It doesn't really explain how it works.
     
  13. Blue Protoman

    Blue Protoman Well-Known Member

    Joined:
    Mar 6, 2010
    Messages:
    4,119
    Last edited by a moderator: Sep 17, 2011
  14. god_at_hell

    god_at_hell Certified Guru

    Joined:
    Jan 5, 2004
    Messages:
    290
    Location:
    Aachen - Germany
    Again ... I can not see the difference between this and a normal ondemand governor. Both use the same technique. The only big difference for me is the flashy "trees saved" windows. Reminds me of other software which promises something big ... like those windows tweakers (don't forget to defragment your registry every second day :p) or memory boosters. Or am I missing anything big?
     
    Last edited by a moderator: Sep 18, 2011
  15. demonstar3

    demonstar3 Still Fresh

    Joined:
    Dec 10, 2010
    Messages:
    49
    erm, i think it is a cool idea, though since i installed it my computer has crashed around 2-3x and the weird thing was I think it was in hibernation mode :\


    running windows 7 professional 64 bit.
     
  16. Blue Protoman

    Blue Protoman Well-Known Member

    Joined:
    Mar 6, 2010
    Messages:
    4,119
    Weird.


    god_at_hell: I don't know about those so I couldn't tell you. But this is free, so why not give it a shot?
     
  17. god_at_hell

    god_at_hell Certified Guru

    Joined:
    Jan 5, 2004
    Messages:
    290
    Location:
    Aachen - Germany
    Ok ... you're right ... a test would be the way to go. I think I will do a test of granola on my laptop. I will sample the power consumption or energy status every minute under different conditions (movie viewing, working, surfing, compiling). The same test I will do with the standard ondemand governor. Since I am at a buisness meeting for this week, I have to wait for the weekend to do this and will report back afterwards. :)
     
  18. god_at_hell

    god_at_hell Certified Guru

    Joined:
    Jan 5, 2004
    Messages:
    290
    Location:
    Aachen - Germany
    So, here is my test of Granola. It took a little bit longer, because I had not free time I wanted to burn for this (I had to read Robert Jordans "Eye of the World" :) ).


    About the Test:


    I wrote a simple Python program which sampled the power consumption of my notebook every 20 seconds and dumped them to a file. Sincere the laptop is a little bit special in the way it gives the power consumption, I had to cut the first 5 samples from every data set. What remains are 25 samples for each measurement. Exept for the "work/surf" test. Here there are 40 samples. Some tests I did several times. Here you will get a weighted mean.


    The error stated for each test is the statistic error. The systematic error should be around +-0.3 watt and is given by the spread of means of the power consumption at idle. The different idle tests were done at different times and different battery states. Systematics come from background jobs, dependence between read out value and battery state, system temperature and more.


    Tests and results:


    Idle:


    ondemand: (7.23 +- 0.03) W


    Granola: (6.96 +- 0.04) W


    watching a movie:


    ondemand: (14.81 +- 0.02) W


    Granola: (14.95 +- 0.02) W


    transcoding a movie:


    ondemand: (32.53 +- 0.09) W


    Granola: (32.50 +- 0.09) W


    kernel compile (-j1):


    ondemand: (20.46 +- 0.03) W


    Granola: (20.05 +- 0.09) W


    kernel compile (-j4):


    ondemand: (32.15 +- 0.04) W


    Granola: (32.22 +- 0.04) W


    working and surfing (no wlan):


    ondemand: (12.01 +- 0.54) W


    Granola: (12.57 +- 0.73) W


    For the working/surfing scenario I tried to produce the same enviroment for both tests. I wrote something for the same amount of minutes, loaded the same webpages and watched the same flash movies. To get a lower statistical error in this test it would be better, if the test time is longer (eg. one hour instead of 15mins).


    End result:


    For the applied tests both governors perform the same (keep in mind, there is a systematic error of +-0.3 W). If there is a better power consumption for Granola, it has to be in the range of the stated errors and with this far below the 15-30% energy savings stated on the Granola webpage.


    What was not tested is the reaction time of the system. The webpage states, that Granola is a fast governor, which does not decrease the system resonsiveness. Since I did not notice any negative impact of the ondemand governor in the past, I see no real gain from using Granola (but no harm either).


    PS:


    For the tests I checked If Granola was running like it should. The governor was reported by cpu-freq-info to be "userspace" and frequency scaling was obvious. This means Granola worked like it should.


    NOTE: If you test Granola and deinstall it afterwards, you have to reinstall or rewrite the init-script which starts the ondemand governor. Granola deletes the entry on install and does not rewrite it when it is deinstalled.
     
  19. Alec

    Alec Member

    Joined:
    Mar 5, 2009
    Messages:
    431
    Color me unsurprised :rolleyes:


    They're probably after computer usage statistics, since apparently it sends back data ("By logging into your Granola account, you can track savings across systems through the Granola website").
     

Share This Page

Loading...