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| Android 4.3 supports TRIM for all the Nexus line, data access performance |
One of the complaints about the Nexus 7 is early access speeds (I / O) memory of the machine slowed down after a few months of use. After reset, the machine run faster, but some time later, the phenomenon appears. Now, with Android version 4.3 has just been released, Google has overcome this issue not only on the Nexus 7, but also on all the other machines in the Nexus family thanks the support TRIM. TRIM is a command that tells the operating system controller (controller) SSD eMMC memory chip or memory cells that are no longer used and can be removed prior to the recording of data can take place more quickly.
In the world of solid-state storage media (SSD or eMMC), deleting a file does not mean that the file had disappeared completely. It disappeared in the user side and the operating system, but the eMMC controller or SSD is still treated as a part of the cell that contains the data. For example, you copy the movie 3GB internal memory of the phone, watch, then delete them. As such, the amount of free memory you added 3GB, but only when the memory block was overwritten by other data, the SSD controller / eMMC new look is the real box. Controller is a technique for tracking vacancies, but more and more cell / block of memory to keep track of (ie, after a long time use and store data), the memory manager will go slower.
To solve it, TRIM appears. It establishes a line of communication between the controller's file system with SSD / eMMC. When a block is TRIM, a signal is sent to the controller to say "empty memory block that already, no need to keep track anymore." Then, a good controller will schedule the cleanup of this memory block to increase performance and reduce the time required to write new data. Of course, the controller must be good enough to be able to do this, is to enable TRIM in the operating system is only the first step. If interested, you can learn more about the mechanism of the deleted file has been TRIM.
According AnandTech, Android 4.3 conditions for conduct that TRIM is: the user does not touch the device for more than 1 hour, without any cleanup commands are sent in the past 24 hours, or the equipment is plugged in with space over 30% battery charger with batteries or plugged in 80%. Goal will be running Android 4.3 TRIM command once every 24 hours if you regularly plugged into the night air. Of course, users can still comfortably spend machine, the OS TRIM will do by themselves, and a few days, not even weeks conducting TRIM is not much affected.
Source: AnandTech