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Thread: Wow, Linux does win at folding!

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    Wow, Linux does win at folding!

    I finally see what DirectHex@co mean about Linux being a better platform for running the SMP client.

    I chucked a fresh install of Ubuntu 7.10 64-bit on this machine last night, 1% of a WU on Vista takes ~17mins, on Ubuntu it takes ~15mins.

    By my calculations, thats almost 12% quicker.

    I'm going to stay booted to Ubuntu for 24hrs and see if I can complete a WU in a day over the weekend, and then see how quick it goes overclocked!

    Well played Tux!
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    The late but legendary peterb - Onward and Upward peterb's Avatar
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    Re: Wow, Linux does win at folding!

    Try running the system with the X server shutdown and no gui (usually runlevel 3) and you will gain another small increase in speed.
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    Re: Wow, Linux does win at folding!

    Interesting, I have an old s940 opteron 150 rig to put back together at the weekend as a linux/bsd rig/firewall... worth putting folding on it then?
    [
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    Comfortably Numb directhex's Avatar
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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by peterb View Post
    Try running the system with the X server shutdown and no gui (usually runlevel 3) and you will gain another small increase in speed.
    note: runlevels are not used this way in anything debianish or ubuntuish

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    Comfortably Numb directhex's Avatar
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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by 0iD View Post
    Interesting, I have an old s940 opteron 150 rig to put back together at the weekend as a linux/bsd rig/firewall... worth putting folding on it then?
    the speed increase will be much less for single-threaded f@h. it's the "smp" version that shows its strength

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    Seething Cauldron of Hatred TheAnimus's Avatar
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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by directhex View Post
    the speed increase will be much less for single-threaded f@h. it's the "smp" version that shows its strength
    Mostly because the windows port is utter s**t.

    but yes if you where building a box to do folding, it would seam that a linux is the best bet, deb seams faster than netbsd for my tests. Then i thought how stupid it was leaving a PC on 24/7 when i'm not using it.......
    throw new ArgumentException (String, String, Exception)

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    Comfortably Numb directhex's Avatar
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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by TheAnimus View Post
    Mostly because the windows port is utter s**t.

    but yes if you where building a box to do folding, it would seam that a linux is the best bet, deb seams faster than netbsd for my tests. Then i thought how stupid it was leaving a PC on 24/7 when i'm not using it.......
    not so bad if your house has electric heating, since the heat generated by the box is heat you don't need heaters to generate

    but now we're back to the age old "is fah bad" argument had on a thousand threads before

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    Seething Cauldron of Hatred TheAnimus's Avatar
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    Re: Wow, Linux does win at folding!

    i'm looking at putting a waterbased underfloor heating in the living room + bedrooms + hallway. all i can think is that i should heat it with overclocked Q6600s.
    throw new ArgumentException (String, String, Exception)

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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by directhex View Post
    the speed increase will be much less for single-threaded f@h. it's the "smp" version that shows its strength
    Thanks hex clears that up, but as it's going to be on, it might as well fold I suppose.
    [
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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by TheAnimus View Post
    i'm looking at putting a waterbased underfloor heating in the living room + bedrooms + hallway. all i can think is that i should heat it with overclocked Q6600s.
    That could be the ultimate water cooled set up - a string of overclocked CPUs all using your floor as the heatsink - may be you should suggest it to Clunk!
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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by directhex View Post
    note: runlevels are not used this way in anything debianish or ubuntuish
    Thanks (Still very much a noob at the subtle differences between the various Linux distros) - just had a quicjk google and I see that the runlevel scripts, as installed, are different (if I understood the info correctly.)

    This link An introduction to run-levels gives some useful info for any Ubuntu distro users who wantto run their systems in console mode only. (It involves editing the appropriate runlevel script)
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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by TheAnimus View Post
    i'm looking at putting a waterbased underfloor heating in the living room + bedrooms + hallway. all i can think is that i should heat it with overclocked Q6600s.
    THAT is a masterpiece

    what a great idea

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    Re: Wow, Linux does win at folding!

    Quote Originally Posted by Zak33 View Post
    THAT is a masterpiece

    what a great idea
    Could be a legitimate strategy if the WC loop for the PC can be integrated into the underfloor heating system - not sure how hot the water from a WC system gets though - might not be that effective - still, a very cool idea!
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    Re: Wow, Linux does win at folding!

    How hot the water gets depends on two things, how much heat you put into it and how much heat is dissipated at the heat exchanger, in this case the floor.

    Now a overcocked Q6600 probably produces up to 150W of thermal energy assuming a water flow rate of 6 Litres per minute we have the following situation,

    Specific heat capacity of water = 4.1813 J/gK
    Flow rate of water = 6 L/min = 100 g/s (assuming a density of 1000 kg/m3)
    Heat input = 150W = 150 J/s

    J = Joules
    g = Grammes
    K = Temperature in Kelvin
    L = Litres
    min = Minutes
    s = Seconds

    So rearranging that you get,

    4.1813 = 150/100*K

    therefore K = 150/(100*4.1813) = 0.359 K

    So assuming the water came in at 25ºC it would leave the CPU block at 25.359ºC assuming there is enough surface area through out the house to dissipate all the heat (which seems reasonable) then you are going to need quite a few Q6600 to heat a house! Obviously you could lower the flow rate to say 1L per minute then you would get a temperature increase of 2.15ºC per Q6600 but that might be pushing it to cool the processor, standard water cooling loops ideally run at 3.8 L/min and above (1 American gallon per minute) a water increase of 0.566ºC.

    Now the heat capacity of air is 1.012 J/gK so you can increase the temperature of 1g of air by ~4ºC for every 1ºC decrease in 1g of water temperature, but you cant increase the air temperature above the temperature of the water.

    Now assuming that the is no energy leakage in the rooms they will continue to get steadily warmer and warmer (obviously this is not the case) as the is no thermal control on the loop, you would need to throttle the processors based on room temperature.

    Assuming a room temperature of 25ºC (so water temperature into processor is 25ºC) and water temperature out of the processors of 30ºC a water flow rate of 3.8 L/min you would need 9 Q6600 to heat your water. Of course you could cool the north bridges, south bridges, memory and hard drives as well then you may be getting 250W per setup and would only need 5.5 rigs (so 6 I guess ).
    Last edited by Webby; 08-03-2008 at 03:11 PM.

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    Re: Wow, Linux does win at folding!

    even if the system were used as an extra to supplement the standard heating in that setup - it would still be contributing, even if it's only a little bit. The energy wouldn't be wasted... and if the maths is correct - only 6 PCs to heat a house? that's gotta worth something

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    Re: Wow, Linux does win at folding!

    The six systems only provides 30ºC water out of the last block the calculations for how much energy would be needed to effectively heat the entire house would be slightly more involved and without room dimensions and an estimate of heat losses I wouldn't like to make a guess at the required heat load for a whole house.

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