Green Computing is the effort to reduce the poffwer coffnsumption of computers through efficiency. It follows the ideal of sustainable development, progress without compromising the future. Though computers use just 3% of the power in the U.S., computer based solutions make Green Computing’s in uence have more a ect.
The terms Green Computing, Green IT and Sustainable Computing can be used interchangeably. When they are actively pursued, they address the ethical responsiblity to protect the environment by promoting power efficiency. For corporations, Green Computing is an integral part of a Corporate Social Responsibility program. Three motivations for Green Computing are Profit, regulation and ethics.
Power efficiency of use and manufacture are design issues. To recycle computers, they must be manufactured to facilitate recycling. To fully enable reduced power consumption, the components must be designed to consume power proportional to the amount of useful work done. Special Green Computing sustainability efforts will not be necessary when these principles are fully integrated into computer computer design.
Computer technology can be used to facility energy efficiency in other areas. For example, telecommuting could save huge amounts of fuel. Also, using software to power manage buildings has proven significant savings.
CMOS CPU power usage can be calulated by the number of transistors that switch. Because of scaling, static power consumption is a significant problem which represent wasted power.
Power measurement in Watts is a point in time measurement. Power measurement in Joules is the sum of the point in time measurements. Because of the high clock rate, and rapid changes in Watts, CPU measurements in Joules are estimates based on the sampling rate. Because of this, average Watts are used as the power part of the current leading power/performance metrics.
Reducing power in data centers must address the cooling issue. Running systems at higher temperatures increases energy costs and reduces reliability. Data centers which can avoid active cooling or use more efficient sources of power are able to reduce the total power consumed and have a lower PUE.
Power measurement can be accurately done with inexpensive equipment. Standard tools include the Watts Up! Pro meter, which is less than $200, and is the standard for the Green 500. More advanced meters allow the monitoring to be done at higher rates or be permanently installed, but do not provide more accurate average power consumption.
The optimal power to performance ratio is predicted to be slightly below the optimal performance settings. This is because components consume more power as they heat up.
Idle desktop computers waste a huge amount of electricity. Approximatedly 1.5 TWh of electricity are wasted each year by idle computers. This energy could be saved by implementing proper desktop computer power management. Proper desktop computer power management means turning o computer components and whole computers when they are not in use.
The naive power management solution for desktop computers is to turn the com-puter o when not in use. This solution is viable will save 50% or more power when compared to a computer that is not power managed. Remote wakeup and access, and 24/7 production boxes must be addressed for large scale deployment inside organizations like a city government.
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