Roadmaps for 16KB Page Size Support and Cross-Platform Progress

[crowforkotlin]

• The project is currently built based on Release-version Android .so libraries, which do not yet support 16KB page sizes. We are looking forward to supporting this in future updates.

• Currently, Wasmline successfully runs on Kotlin Multiplatform (Android, Windows, and Ubuntu) via JNI using Wasmtime. For iOS support, the implementation will be handled through the Kotlin/Native side.

Project Link: https://github.com/crowforkotlin/wasmline

Reference (Android 16KB Page Size): Android Developer Documentation

[alexcrichton]

Do you know what we would need to do to modify our binaries to work with 16k page sizes? Is it just a compiler a flag? A linker flag? An updated SDK?

Most of us aren't Android experts so outside guidance on how to solve this would be much appreciated.

[crowforkotlin]

@alexcrichton

Hi there,

I am very glad to see your reply!

I would like to share that I’ve successfully built the Android library with 16KB page size alignment tonight by modifying ./ci/build-release-artifacts.sh. The process was quite smooth and didn't require any additional configuration changes.

Currently, I am working on a project called wasmline, which is a Kotlin Multiplatform (KMP) project. My goal is to provide cross-platform support leveraging a minimized version of Wasmtime. Initially, I found that the default min build profile stripped too many features required to execute Wasm binaries produced by the Kotlin/WASI compiler.

To address this, I customized the build parameters to restore the essential features while opting for a JIT-less configuration. This allowed me to significantly reduce the binary footprint from 29MB to 3.9MB.

I have verified that the 16KB ELF alignment is correctly supported, and I am currently integrating these .so libraries into the wasmline project to enable Android support.

You can find my modifications and the project structure here:

• Modified build script: https://github.com/crowforkotlin/wasmtime/blob/main/ci/build-release-artifacts.sh
• Wasmline project: https://github.com/crowforkotlin/wasmline/tree/main/wasmline-multiplatform

Thank you very much for your support!

[crowforkotlin]

@alexcrichton

[crowforkotlin]

[alexcrichton]

I've sent #12246 to attempt to fix this. I don't have a great way of verifying the result, so @crowforkotlin you'll need to verify yourself too. Additionally if you're performing your own build then you can set RUSTFLAGS to pass -Clink-arg and that's not something we'd bake into Wasmtime itself.

Also, FWIW, if you're able to copy/paste text instead of pasing screenshots that'd be appreciated as they're easier to digest and analyze. Thanks!