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Intel's Haswell, U brought improvements on power consumption, but to be expected blessing. Back in January, Intel said the new Haswell will bring "Intel Historically, the energy consumption improved leap across time." And he says this is their first time U is designed for ultra-pole and flat design, New CPU running at a lower clock frequency and smaller power on. In the conference, did not hear about "Maverick" system in mobile use situation on the power, but in the power of new technology to improve on to mention a few. Until more information in a subsequent disclosure to explain the technical details of the PDF, we will know how "Dallas" to see what all the system power-saving technology. Electricity efficiency improvements, the first goal of course is to let the battery can sustain longer, but Apple also claims that they can achieve this goal, but not to the expense of speed corresponding loss system, through the following three techniques: First of all: the memory compression technology. And traditional thinking in the power-saving technology is not the same, Apple's memory compression technology "Automatically recently used objects in memory internally compressed to half its original size." When an object is called again when needed, and then decompress objects. Apple claims that this memory compression / decompression technology, compared to the temporary swap hard disk space much faster, and even compared to the fastest SSD solid state drive, too, which must thank WKdm fast compression algorithms. A paper published in 2003 compared three memory compression algorithm for real-time performance, WKdm compression and decompression performance very good, faster than the other two algorithms. This can save a lot of memory and increase speed, save disk space. And Apple has also claimed that: "This can reduce the system to read and write disk swap data frequency, and ultimately improve the performance of Apple notebook power consumption." And occupies only a very small amount of CPU resources to handle the compression / decompression process. Then, is the "program hangs." This new feature tough restrictions not in the foreground operations / visible more thorough program enters a suspended state. The new strategy is that when a program status window is not visible, and there is no audio playback, strictly limit the program's resource usage. OSX system limits the program counter, limiting the background idle interrupt request to the CPU program, "the program frequently by limiting resource requests, which greatly improved the efficiency of CPU utilization." Disk and network activity compared to the previous version, with more stringent restrictions. A pending procedure is given access to the network and disk resources of the "lowest priority", which means lower power consumption and speed up the foreground program disk corresponding speed. "I / O limit reduces the overhead of background processes." "Maverick" system also reduces the UNIX process priority is lower than the suspended program to reduce the CPU resources. Overall, these changes will be more lower overhead daemon, for those who design programs that run at full speed for the background, the system will give the more severe restrictions. Finally, Apple introduced called "clock scheduling" technology, which is only in the notebook on battery state. OSX system will take "constant CPU counters" strategy, including disk and network resources, as well as all requests, like DHCP to obtain, wifi connected to the system upgrade notification triggers, because the program is no mutual coordination between the requesting action, so a station is idle macbook various procedural requests may be harassed, so that the CPU had been active, the CPU and the disk can not really get into power saving mode.Apple Laptop batteries
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