Google has been experimenting with the ART runtime compiler for quite some time now. Introduced initially alongside Android 4.4 KitKat, it was far from ready to be deployed as the default. However, over the months stability has improved multi fold and so has application compatibility. What exactly is the difference between the two compilers? The current compiler ie Dalvik is a JIT compiler. JIT means Just In Time. What this means is that it will compile code only when the app needs it. In comparison, ART relies on Ahead Of Time compiling which will run the code before it is needed. Since it compiles the code at the time of installation, it will offer improved performance, better battery life with slightly larger installed app sizes being a tradeoff. Another possible tradeoff is that applications that haven't been rewritten for ART may not work properly. That said, most popular applications have long since been updated. Dalvik is dead, long live Dalvik! DO NOT MERGE croot cd libcore repo start dalvik-is-dead-long-live-dalvik . repo sync -c . git rm -r libdvm git add JavaLibrary.mk (after removing libdvm references, adding explict core-libart references) git add Docs.mk (after replacing references to libdvm with libart) git add ...
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