16KB pagination support for PyTorch ExecuTorch

[darriousliu]

🐛 Describe the bug

• System information

  • PyTorch ExecuTorch Android Vision 0.6.0: https://mvnrepository.com/artifact/org.pytorch/executorch-android/0.6.0

• Code

  • Checked ELF Alignment to app with libs and the following shared libraries are not aligned.

  • libexecutorch.so, libfbjni.so and libc++_shared.so from Lite lib do not support 16KB alignment.
    google guide :https://developer.android.com/guide/practices/page-sizes?hl=en

From Nov. 1st, 2025, all the apps submitted to Google Play and targeting Android 15+ need to support 16 KB page sizes.
Source: https://android-developers.googleblog.com/2024/12/get-your-apps-ready-for-16-kb-page-size-devices.html

when is ETA for supporting 16KB so alignment?

Versions

0.6.0

[almerbuda]

I have also apps in Google play which will need to be 16K aligned on November 2025. Is it planned for executorch?

[nrburnett]

Agreed this is making me quite worried given the deadline. I’m surprised none of the logged pagination issues have received any attention. Thought the whole of Executorch was mobile deployment of which android is a huge chunk.

[YuHayring]

Maybe we can build ourselves. Like add this line into .configure parameter --extra-ldflags=" -Wl,-z,max-page-size=16384"

[SS-JIA]

It seems that this issue has now been fixed! Please refer to #11597.

Feel free to re-open if this is inaccurate.

[yong543210]

This issue is marked closed. I wonder what is the solution?

I have use the latest executorch 1.0.0-rc3 and still get the same problem.

implementation("org.pytorch:executorch-android:1.0.0-rc3" but still get not 16kb compatible on android 16kb emulator as recommended by Google. See attached.

[SS-JIA]

cc: @kirklandsign any idea why the app compatibility things is still showing up?

[kirklandsign]

This issue is marked closed. I wonder what is the solution?

I have use the latest executorch 1.0.0-rc3 and still get the same problem.

implementation("org.pytorch:executorch-android:1.0.0-rc3" but still get not 16kb compatible on android 16kb emulator as recommended by Google. See attached.

Hi @yong543210 thank you for the feedback! Mind trying this one? https://gha-artifacts.s3.us-east-1.amazonaws.com/pytorch/executorch/18572029650/artifacts/executorch.aar

[yong543210]

This issue is marked closed. I wonder what is the solution?
I have use the latest executorch 1.0.0-rc3 and still get the same problem.
implementation("org.pytorch:executorch-android:1.0.0-rc3" but still get not 16kb compatible on android 16kb emulator as recommended by Google. See attached.

Hi @yong543210 thank you for the feedback! Mind trying this one? https://gha-artifacts.s3.us-east-1.amazonaws.com/pytorch/executorch/18572029650/artifacts/executorch.aar

Thanks. Here is the result below . 2 issues left.

[kirklandsign]

Hi @yong543210 what app do you use? I didn't see this on Android Studio APK analyze tool

[kirklandsign]

Also I see

$ANDROID_HOME/ndk/29.0.13113456/toolchains/llvm/prebuilt/darwin-x86_64/bin/llvm-objdump -p cmake-out-android-so/arm64-v8a/libexecutorch.so| grep LOAD
    LOAD off    0x0000000000000000 vaddr 0x0000000000000000 paddr 0x0000000000000000 align 2**14
    LOAD off    0x0000000000b9adb0 vaddr 0x0000000000b9edb0 paddr 0x0000000000b9edb0 align 2**14
    LOAD off    0x0000000000bbf4d0 vaddr 0x0000000000bc74d0 paddr 0x0000000000bc74d0 align 2**14

[kirklandsign]

Here is from 1.0.0

    LOAD off    0x0000000000000000 vaddr 0x0000000000000000 paddr 0x0000000000000000 align 2**14
    LOAD off    0x0000000000bc4fb0 vaddr 0x0000000000bc8fb0 paddr 0x0000000000bc8fb0 align 2**14
    LOAD off    0x0000000000be98b0 vaddr 0x0000000000bf18b0 paddr 0x0000000000bf18b0 align 2**14

[yong543210]

Hi I am using 16kb emulator which auto runs the app to check 16kb compatibility.

Attached screenshot.

The link is at https://developer.android.com/guide/practices/page-sizes#16kb-emulator

Maybe you can post the link to version 1.0.0 where I can download and try.