Examination Of Energy Efficiency For Mac

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MacBook Air is designed to be energy efficient right out of the box. It’s even earned the EPA’s ENERGY STAR qualification for its low power consumption.

Efficient power supply.

MacBook Air includes a highly efficient power supply that reduces the amount of power wasted when bringing electricity from the wall to your computer. Lower power consumption reduces energy bills and lessens the environmental impact of greenhouse gas emissions from power plants.

Advanced power management.

Unlike a lot of Windows-based PC systems, MacBook Air uses energy-efficient hardware components that work hand in hand with the operating system to conserve power. OS X activates sleep mode on already energy-efficient LED-backlit displays. And it balances tasks across both central processors and graphics processors. OS X never misses a power-saving opportunity, no matter how small. It even regulates the processor between keystrokes, reducing power between the letters you type. That’s just one of many ways Apple manages small amounts of power that add up to big savings.

ENERGY STAR qualification.

MacBook Air meets the stringent low power requirements set by the EPA in their ENERGY STAR 5.2 qualification. ENERGY STAR 5.2 sets significantly higher efficiency limits for power supplies and aggressive limits for the computer’s typical annual power consumption.

It’s what MacBook Air doesn’t have that makes it more environmentally friendly. It’s free of many harmful toxins like mercury, arsenic, BFRs, and PVC.

Fewer toxins.

The greatest environmental challenge facing the computer industry today is the presence of arsenic, brominated flame retardants (BFRs), mercury, phthalates, and polyvinyl chloride (PVC) in products. Apple engineers have worked hard to eliminate BFRs and PVC from MacBook Air circuit boards, internal and external cables, connectors, insulators, adhesives, and more.¹ And they’ve eliminated many other toxins that are a common part of notebook computer manufacturing — choosing, for example, mercury-free backlighting and arsenic-free glass for the MacBook Air display.

Because MacBook Air is made from aluminum, it’s more likely to be recycled and reused at the end of its long, productive life.

Recyclable materials.

Apple has minimized the waste when MacBook Air reaches end of life through its ultraefficient design and the use of aluminum, which recyclers can reuse for other products.

Free recycling for your old computer.

If you live in the U.S., Apple offers a free recycling program for old computers and displays with the purchase of any new Mac. Learn more on the Apple Recycling site

Apple takes a complete product life cycle approach to determining our environmental impact.

Life cycle impact.

Apple’s life cycle analysis accounts for all emissions associated with our products. That includes raw material extraction, manufacturing, packaging, transportation, energy consumed during use,² and recycling. In the course of this analysis, we determined that 97 percent of Apple’s total greenhouse gas emissions come from the products we make.

Learn more on the Apple and the Environment site

Energy Efficiency and the User Experience

All apps consume energy—whenever they update the user interface, perform networking operations, write to disk, or run code on the CPU. As users rely increasingly on battery power—and as apps proliferate—energy efficiency becomes integral to the user experience.

A great user experience requires:

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Great battery life. As energy efficiency goes down, so does battery life. Users want all-day battery life on their portable devices.

Awesome speed. OS X is designed to provide great performance during complex operations—and to make your app fly.

Responsiveness. Too many resources being consumed at once can result in a laggy interface that’s slow to respond to user input.

Examination of energy efficiency for mac 2017

Cool, quiet system. As more apps use more resources, the system works harder and faster, and the physical temperature of a device gradually rises. When this occurs, the system takes steps to cool down to a more acceptable level. On devices with fans, those fans may become active and audible to the user.

OS X Energy-Saving Technologies

OS X employs advanced energy-saving technologies that help users get the most out of their Macs. These features help the system make smart decisions about how to utilize resources and run code as efficiently as possible.

Centralized Task Scheduling and Grand Central Dispatch

Intensive background operations, such as software updates or file backups, may be unavoidable. Centralized Task Scheduling (CTS) and Grand Central Dispatch (GCD) APIs let you designate criteria that indicate when and how often a task should be deferred, how long it can be deferred, and under what circumstances. The system then makes an intelligent decision about when to perform the task based on the specified criteria.

Quality of Service Levels

Tasks that affect the user, such as downloading and playing music, take priority over background and discretionary work. Quality of service class APIs allow you to assign distinct priority levels to the work your app performs, giving you fine grained control over task prioritization.

Event-Based APIs and Services

Timers deliver events, or fire, at prescribed time intervals. If a timer fires when the system is idle, the CPU and numerous other systems are awakened from their low-power states. Yet many of these systems aren’t always needed to perform the work invoked by the timer. If the work can be performed when the system hardware is already running, the additional cost is not incurred and the CPU can remain idle longer. OS X provides services and APIs that efficiently deliver events without unnecessarily waking the CPU.

App Nap

When your app isn’t busy performing user-initiated work, the system may put your app in App Nap. App Nap conserves energy by regulating your app’s CPU usage, I/O, and timers. As soon as the user resumes interacting with your app, OS X switches it back to full speed. Transitions are so seamless that the user thinks your app has been running at full speed all along. You can enhance App Nap by implementing notifications that tell your app when it becomes inactive, so it can immediately start reducing activity.

Battery Menu, Activity Monitor, and Developer Tools

The Battery Status menu and Activity Monitor let you quickly identify apps that are using significant amounts of energy in OS X. Xcode, Instruments, and numerous command-line tools help you identify and address energy problems as you develop your app, rather than after those problems are encountered by users.

Your Obligation as a Developer

Even small inefficiencies in apps add up across the system, significantly affecting battery life, performance, responsiveness, and temperature. As an app developer, you have an obligation to make sure your app runs as efficiently as possible. Use recommended APIs so the system can make smart decisions about how best to manage your app and the resources it uses. Whenever possible, avoid unnecessary updates to the user interface and I/O. Power-intensive operations should be under the user’s control. If a user initiates a large iMovie render, Automator batch job, Compressor conversion, or Xcode compile, for example, the user should not be surprised if the activity consumes power. Strive to make your app absolutely idle when it is not responding to user input.

By adhering to recommended guidelines, you can make big contributions to the overall energy efficiency of the platform and the satisfaction of your users.