The Dalvik VM is an interpreter only virtual lmachine that executes file in the Dalvik Executable (.dex) format, a format that is optimized for efficient storage and memory mappable execution. (As of Android version 2.1 (eclair), the list of classes preloaded by zygote had 1,942 entries). At boot time, a single virtual machine, called 'zygote' is created, which preloads a long list of classes. Every Android application runs in its own process, with its own instance of the Dalvik virtual machine. Setting dalvik.vm.heapgrowthlimit slightly too low causes apps to run slower than normal because GC. If you set dalvik.vm.heapgrowthlimit too low, normal apps will be killed when the virtual machine runs out of memory. The dalvik.vm.heapgrowthlimit sets the maximum limit for the amount of RAM given to Dalvik/ART virtual machine for normal apps. The virtual machine runs the Java platform on compatible mobile devices. It is developed by French/Swiss firm Myriad Group. Dalvik Turbo is a proprietary alternative to Google's implementation of the Dalvik virtual machine that runs on the Android operating system and other platforms.
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