[HARDWARE] Cost of crunching (was: Mac Questions)

Thord Nilson thordn at stacken.kth.se
Mon Mar 18 13:22:02 EST 2002


On Mon, 18 Mar 2002, John L. Bass wrote:

> Hi Thord,
> 
Hi!

[SNIPPED a lot of good stuff]
> 
> Linux PM support is getting pretty good (see apmd), and has significant
> power savings, using the BIOS to provide the machine specific support.
> I suspect the better than 50% savings on the 2xCeleron numbers below
> are due to PM kicking into DOZE/IDLE mode with apmd and BIOS PM enabled.

No it is not, I should add that these figures were taken without 
the effect of any powersaving mode on any of the machinenes, it is just
the difference between the kernel-idle loop and running the RC5 client.

So these figures are valid for an active server running RC5 instead of
the idle loop, giving a *minimum* cost for RC5.

If powersaving modes had been included the cost numbers within ()
below would be much more close to the truth. 

To this should be added the cost of service/repair of marginally
designed motherboards that can not take the full load continously,
but would be OK with normal use.

[SNIP]

/Thord

>> 
>>(It even takes LESS power with certain programs)
>>Also the RC5, DES, OGR CSC takes different power. (on some machines DES
>>takes more than RC5 on onther less)
>> 
>>Assuming:
>>All machines run on Linux.
>>The cost for 10 KWh is 1 USD.
>>The machines are on anyway, only extra power is from crunching vs 
>>idling.
>>
>>Total # of keys to check = 2^64.
>>USD = Delta/10000/3600/Perf * 2^64  (Perf is in keys/sec)
>>
>>                Power in W                 Performance  M-USDto
>>System              Running RC5  idle   Delta   Mkeys/s complete***
>> 
>>486-DX4-OD 100 MHz     112.8     102.8   10      0.093     55.1 (621)
>>Alpha 21064 100 MHz**   88.8      85      3.8    0.086     22.6 (528)
>>Pentium-MMX 200 MHz     41        32      9      0.428     10.8  (49)
>>AMD-K6 233 MHz          72.5      35     37.5    0.400     48.0  (93)
>>AMD-K62 500 MHz         84        57     27      0.864     22.2  (69)
>>2xCeleron 450 MHz*     116.7      55     61.7    2.544     12.4  (23)
>>Athlon TB 1100 MHz     115        98.3   16.7    3.388      2.5  (17)
>>
>>	*   Celeron 300A overclocked to 450 MHz.
>>
>> 	**  Running OGR actually takes less power than idling.
>> 
>> 	*** Number in () is if machine is on because of crunching.
>> 	    This number is not really representative for the CPU since all
>> 	    machines have different pheripherals, like sound card, number
>> 	    of HD:s CD-ROM/CD RW, memory etc...
>> 
>> 
>>	/Thord.


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