Method for calculating energy efficiency of information technology equipment
The present invention provides a METHOD TO CALCULATE AN ENERGY EFFICIENCY RATING for information technology equipment. This method specifically pertains to information technology equipment that doubles its capabilities in a predetermined timeframe according to Moore's Law. This method uses a formula to calculate an energy efficiency rating based on power consumption and transactions per second. It further calculates a normalized rating where the absolute rating is adjusted based on Moore's Law prediction of improvements. As a result the method invented is the first and only method to compare information technology from various generations of hardware, processor and component architecture with each other in terms of their energy efficiency.
1. A method to calculate energy efficiency of information technology equipment, comprising:
providing a transactions per second value for a piece of information technology equipment;
determining a power consumption at 100% load value for the piece of information technology equipment; and
calculating an energy efficiency of the piece of information technology equipment by dividing the transactions per second value by the power consumption at 100% load value.
2. The method of claim 1 , wherein calculating the energy efficiency further comprises calculating an absolute rating of energy efficiency of the information technology equipment.
3. The method of claim 1 , wherein calculating the energy efficiency further comprises calculating a normalized rating of energy efficiency of information technology equipment over time.
4. The method of claim 1 further comprising generating a normalized ratings graph for information technology equipment that shows the expected rating of such equipment over time and in the future.
5. The method of claim 1 further comprising using the energy efficiency to give purchasing guidance based on said energy efficiency ratings so that equipment purchasing decisions can include performance per energy usage.
6. The method of claim 2 , wherein calculating the absolute rating of energy efficiency of the information technology equipment further comprises using the formula:
Log 2 (tps/watt)*100
wherein tps is the transactions per second value and watt is the power consumption at 100% load value.
7. The method of claim 3 , wherein calculating the normalized rating of energy efficiency further comprises using the formula:
Log 2 (tps/watt*proc*2 (cyr−nsyr)mly ))*100
wherein tps is the transactions per second value, watt is the power consumption at 100% load value, proc is a number of processors in the information technology equipment, cyr is a current year, nsyr is a start year of the normalization, and mly is a number of years per Moore's law for said equipment for a 2 times performance increase.
8. The method of claim 1 , wherein calculating an energy efficiency further comprises calculating an energy efficiency of the piece of information technology equipment by taking a logarithm of the transactions per second value divided by the power consumption at 100% load value.