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Questions tagged [dex2oat]

dex2oat is an on-device compiler suite that converts DEX files generated by the Android compiler into OAT files at install time, which are used by the new Android 5.0 runtime, ART, to enable higher performance by using Ahead of Time compilation instead of the older Just in Time (JIT) used in older versions of Android. It features several backends for the actual compilation and code generators for all platforms supported by Android.

See also the Configuring ART Guide, which is part of the Android documentation, for further details.

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Difference between dexopt and dex2oat?

Google is moving from Dalvik to ART(Android Runtime). I was trying to understand, how it is going to improve the performance. The best explanation I found is the below image: One of the main component which has changed is dexopt to dex2oat. Since I…
Gokul Nath KP
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Load DEX file dynamically on Android 5.0

Prior to Android 5.0 I was able to load DEX files dynamically using DexClassLoader and calling loadClass() method but with the latest Android version I get a ClassNotFoundException. Here is what I am doing: Generate DEX…
garibay
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Marshmallow - dex2oat ~ permission denied

Got forced close when trying to start CameraApp: 08-15 15:36:19.807 E/dex2oat (29758): Failed to create oat file: /data/dalvik-cache/arm/system@priv-app@LGCameraApp@LGCameraApp.apk@classes.dex: Permission denied the file does exist on the stated…
wez
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Installing app takes minutes with dex2oat warnings

I have re-opened an Android Studio project after quite some time, and I'm seeing fast builds as usual, but now the "Install" step from Android Studio (3.5) is taking minutes, while it used to take seconds. If I open the device Logcat while…
natario
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Android compiler, architecture and runtime, how doeas it work together?

I am studying Android runtime recently, especially focusing on dex2oat tool which is the heart. However dex2oat is not isolated but works together with Android's boot-image, android-root, instruction-set, runtime-arg etc. Can anyone explain what…
Harvey Dent
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Does dex2oat compile all methods?

I understand that on recent versions of Android, Dex files are compiled into OAT files on-device. Do OAT files contain compiled versions of all methods in a Dex file, or are some methods left as Dex bytecode and interpreted at run time?
er0
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Does Android 6 (Marshmallow) have JIT enabled by default?

I have a question regarding the build method used in version 6 of the Android platform. I have a rooted LG Nexus 5,running version 6.0.1, and I am conducting a performance study of Android applications, where I run applications several times and…
Maniche
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java.lang.ClassNotFoundException: Didn't find class ... on path: DexPathList

I am making an android project game which I recently added some libraries to this project, and since I did I get the same error: dex2oat : Failed to create oat file: /data/dalvik-cache/arm/data@app@***.*******.*************-2@base.apk@classes.dex:…
gever
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How to convert Dalvik Bytecode to LLVM IR?

I want to convert Dalvik bytecode to LLVM IR. I know google's ART can convert dalvik bytecode to oat file via dex2oat. Dex2oat is based on LLVM, and I only want to convert the dex to LLVM IR rather than oat. So, could you show me the front end used…
YjyJeff
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Optimizing installed app after install using dex2oat

I am working on an app store application. Google Play optimizes apps at install time by the baseline-profile provided by the developer. As an app store, I want to do the same thing at install time. I researched about it and faced dex2oat and…
David
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Compiling APK with dex2oat on Linux host

I am trying to compile an APK (more specifically, a dex file) to an OAT using dex2oat on a Linux host. I followed the instructions given here and I get the following error: Could not create image space with image file…
marteng
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why App is Starting with 40 seconds of delay?

in my SplashActivity I used retrofit and eventbus . I must wait for starting retrofit request or maybe starting APP at least 40 second . before that is just showing a white page. in each second I get two Log series like this : 01-04 09:36:08.104…
Simon
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how to compile dex2oat which can run in ubuntu

I have downloaded AOSP, but I don't know how to compile android shell program, like dex2oat, which can be run in Ubuntu.
Blueke.Zhou
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samsung rom art file

I used Samsung ROM, install a apk when it used dex2oat, when parameter is --art-fd=13, there is a *.art file, then app crash. when parameter is --art-fd=-1, there is not a *.art file, then app runs normal. I want to know what is art file. anybody…
zhengwei
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Is it possible turn all dex in one apk to oat when installing apk?

I found this code in Android: bool DexFile::OpenFromZip(const ZipArchive& zip_archive, const std::string& location, std::string* error_msg, std::vector* dex_files) { ZipOpenErrorCode error_code; …
wawa
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