CODEWITHSUNDEEP
androiddalvikandroid-runtime
Nikola Zarić
Nikola Zarić

Reputation: 885

Is ART sandboxing application like Dalvik?

I was wondering and googling for an answer, but I didn't find it. So, is newer ART sandboxing apps like Dalvik VM? To be more precise, can image from this link be applied for ART too? http://davidchang168.blogspot.rs/2012/07/android-vm-and-application.html

Upvotes: 2

Views: 407

Answers (2)

Paschalis
Paschalis

Reputation: 12301

To be more precise, can image from this link be applied for ART too? enter image description here

You second question is irrelevant to the first one (sandboxing). ART, like Dalvik, exploits the paging mechanism, and actually it is even better than its predecessor. This is because the oat code is pageable, whereas the JITted code is not, as it is dynamically produced. Therefore, not just framework multimedia, ie images, but also code can be shared between applications.

For this to make sense, imagine the class String. I bet it is being used by 99% of Android applications. Therefore its code and a small heap of objects is created once, while a device boots up, on boot.oat and boot.art images. These images can then be shared among applications, and contain more classes than just the String class.

When an application attempts to modify something in such a class the copy-on-write mechanism ensures that the application will get a separate copy of that particular page, while the rest of the apps can continue sharing the original copy of the page.

This page-ability is good for both memory and performance.

Upvotes: 0

CommonsWare
CommonsWare

Reputation: 1007339

So, is newer ART sandboxing apps like Dalvik VM?

The Dalvik VM does not sandbox apps. The Android OS sandboxes apps. ART changes the nature of what is executed (AOT-compiled bytecode instead of JIT-compiled bytecode) in the app. It does not change the nature of the Android process model and the sandboxing approach.

To be more precise, can image from this link be applied for ART too?

Yes.

Upvotes: 5

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