You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
The formula:
E = Server utilization * Number of hours * Number of cores * TDP * TDP co-efficient
= (0.18 * 1 hour * 2 cores * 205 TDP * 0.32 TDP co-efficient)/1000
= 0.023
Contains two mistakes (according to me):
The usage is considered twice: 0.18 and 0.32, more explanation below.
The TDP is for the entire chip not for a single core, so I believe it should be 2/16. From Intel: Thermal Design Power (TDP) represents the average power, in watts, the processor dissipates when operating at Base Frequency with all cores active under an Intel-defined, high-complexity workload.
reacted with thumbs up emoji reacted with thumbs down emoji reacted with laugh emoji reacted with hooray emoji reacted with confused emoji reacted with heart emoji reacted with rocket emoji reacted with eyes emoji
-
Hi,
I was reading the case study in the sci repo (sci/case-studies/eshoppen.md at main · Green-Software-Foundation/sci · GitHub). During this, I noticed a few irregularities of math that doesn’t really add up, mainly with the energy part.
The formula:
E = Server utilization * Number of hours * Number of cores * TDP * TDP co-efficient
= (0.18 * 1 hour * 2 cores * 205 TDP * 0.32 TDP co-efficient)/1000
= 0.023
Contains two mistakes (according to me):
The usage is considered twice: 0.18 and 0.32, more explanation below.
The TDP is for the entire chip not for a single core, so I believe it should be 2/16. From Intel: Thermal Design Power (TDP) represents the average power, in watts, the processor dissipates when operating at Base Frequency with all cores active under an Intel-defined, high-complexity workload.
For the first point, let’s instead of using a TDP co-efficient, use the power curve (https://www.researchgate.net/figure/A-typical-CPU-Utilization-Server-Power-scatter-plot_fig4_352107996) directly. I think if the CPU uses 20% of the entire resource it will use 60W. If 2 cores of the 8 are used, 15W. A carbon intensity of 200gCO2e/kWh results in 4 gCO2e/hour of this resource.
Of course, I could be wrong and would be happy to be.
Thank you so much for your attention and participation.
Beta Was this translation helpful? Give feedback.
All reactions