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[Note: This is a followup to the question about running an Android service in a separate process: How can an Android application have more than one process?]
If I specify a service to run in a separate process, will it have its own heap limit (or does it share the heap limit with that the main process)? In short, are heap limits per-process or per-app?
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Every process will get separate heap, stack independent of other process.
While you might never have to build a multi-process app, it's possible to have an Android app with components running in different processes. You get several benefits like more memory, performance improvement (depends on implementation) and more by going multi-process.
Most devices running Android 2.3 or later will return this size as 24MB or higher but is limited to 36 MB (depending on the specific device configuration). If your app hits this heap limit and tries to allocate more memory, it will receive an OutOfMemoryError and will terminate. Heap memory is used to allocate objects.
The Memory Profiler in Android Studio helps you find and diagnose memory issues in the following ways: See how your app allocates memory over time. The Memory Profiler shows a realtime graph of how much memory your app is using, the number of allocated Java objects, and when garbage collection occurs.
Each process has own virtual memory and address space. Thus, each process also has own heap it manages itself.
However, all processes share the same physical memory, managed by the OS. Thus having a separate process can help with memory issues sometimes, but not always.
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