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Apple WWDC just released iOS 9 offers a new "power saving mode" by suspending background tasks, this energy-saving mode can help devices for up to three hours of use time, such as when the device is placed face down when even reaches, the screen will not be lit, after all, the biggest culprit is the power consumption of the screen.
Apple and mobile devices (Macbook) or a handheld device (iPhone) define very clearly at the outset, for their life time guarantee on the product definition phase has a high weight concerns. So when the General Windows PC laptop battery life is only about three hours of the time, Macbook battery life has been amazing at the time of 6-7 hours, when the PC finally increased to 4-6 after hours, Macbook Air battery life can reach 12 hours.
Lifting devices battery life is nothing more than increasing revenue and cutting expenditure
Open source work is primarily hardware, battery technology has come to a bottleneck stage at this stage, the most straightforward solution is nothing more than increase battery capacity, which increased cell volume, then greatly compressed board space, this is evident on the Macbook and the iPhone.
Throttle on the hardware Apple actually isn't too much at the beginning of the way, is nothing more than more low-power CPU and other components, but the iMac A4 chip in the iPhone 4 Retina display r, from the side showing the throttling determination on the Apple hardware.
Apple throttling is to spare no effort in software, which is the Apple than Windows, Android soft combination of advantages.
Decided to phone standby long is one of the most important factors when dealing with restrictions on background tasks disney
Most basic for, as a Taiwan intelligent phone, iPhone in a began on not provides background task, even system evolution has, iPhone of background task are not desktop system strictly meaning Shang of more task, in iOS 7 zhiqian, Apple only on music, and navigation, scene provides full of background service (that like excellent cool like of background video download task, will secretly to in behind put a mute of music); in iOS 7 yihou, on application for, Have a certain background task space (for example, do a small amount of computation in the background, download a small amount of data), and from a systems viewpoint, in order to ensure that these background tasks, the system can still save battery life, Apple also did very detail optimized at the system level, such as:
In, iOS 7 zhiqian, if you also has part not completed of task, iOS system will in you completed zhiqian actually also is belongs to active state, but in iOS 7 yihou, iPhone can in has was other work wake of situation Xia, again began this should completed of task; on for example said you put a App close has, but you also have calculation some data, these calculation in you lock closed iPhone soon on will was terminated, but if you received has a seal mail push sent, mail push sent put system to activated yihou, Your activation of the computing tasks with the system activated, allowing tasks planning and implementation.
There is an example of this is Apple's push mechanism (APNS). Apple in open development API of beginning on for application provides has APNS of push sent mechanism, let all of application total with a push sent of channel, both save has in standby time within, CPU of loss and network interactive, also improve has push sent of stability and timely sex (push sent message even is in GPRS network status Xia also can stable arrived); and he Shi of Android push sent development, also need each application up a background process to listens push sent message, even later regardless of is Google also is Baidu, and Tencent offers a relatively unified push interface, Android still has a lot of various processes in the background has been calculated, the monitoring network.
This type of power-saving technologies has a similar application in OS x. 2013 WWDC in OS x Macbook battery life is greatly improved on the Mavericks, there are technologies based on three points: first of all, memory compression technology, OS x will compress memory to most commonly used only about half the usual size, but at the user's request and released, which is why even if the Macbook Air is only 4GB of memory, experience is still smooth. Next is sleep (App Nap), Apple is not in the foreground shows the window fully suspend the application of is in fact the iOS on a single page application ported to OS x. Safari before even in the background, there is 15% CPU usage, so this feature and are very considerable energy saving. Finally, similar to the iOS, OS x include a technique called time merging (Timer Coalescing), is that applications and background processes are using many different timer function is triggered, and the technology is just all the tasks execute simultaneously, as shown in Figure:
In terms of increased equipment life time, so Apple users with broken hearts in this regard. Relative to the Android a lot of final results may only be caused by different product definition is different in the two directions, such as whether to allow background processes the technical decision, Google must consider more of a technology can achieve the integrity of, and Apple is considered more user experience, the relative merits and disadvantages of the whole there is no meaning, meaning what is it? Is like a high school teacher to teach it: to conjecture the intent of the examiners.
Author Sina micro-blog: Lee Music
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