WebAssembly Micro Runtime — interpreter (wamr) and AOT compiler (wamrc).
WebAssembly Micro Runtime distribution with two portable commands:
- wamr — stack-based interpreter that decodes and runs a .wasm binary.
- wamrc — AOT (ahead-of-time) compiler that lowers a .wasm module to native code.
A fork of bytecodealliance/wasm-micro-runtime ported from C to Zig and maintained with AI assistance.
Highlights — changes since v3.0.0-dev.12:
- Outbound HTTP futures sleep instead of busy-spinning — worker-thread-settled wasi:http futures get a cross-platform self-pipe Waker on PendingHttpFetchShared; httpFetchWorker signals it after publishing done, pollableBackend(.http_future_response) hands poll() the waker's read fd (P2 block path), and driveAsyncEvents parks on the waker fds rather than re-polling on a 1ms cadence (P3 waitable-set path). pollable.block over a future-incoming-response no longer burns a full core during the round-trip, matching wasmtime's "sleep on the socket" CPU profile; Windows keeps its short re-poll fallback via a comptime-guarded parkOnHttpWakers (#833, #839).
- Dead code elimination re-enabled safely — DCE is wired back into every default IR pipeline, with a regression test guarding that it stays installed across all pipelines (#834, #837).
Install:
ghr install cataggar/[email protected]
See INSTALL.md for more options.
| Publisher | cataggar |
|---|---|
| Version | 3.0.0-dev.13 |
| Release date | 2026-06-11 |
| License | Apache-2.0 |
| Installer type | zip |
| Architecture | x64, arm64 |
| Package ID | cataggar.wamr |
winget install --id=cataggar.wamr -ewinget upgrade --id=cataggar.wamr -ewinget uninstall --id=cataggar.wamr -ewamr adds these commands to the command line: wamr, wamrc.
Yes. wamr is free and open-source software released under the Apache-2.0 license.
The latest version is 3.0.0-dev.13, released on Jun 11, 2026.
The download button links to the official installer published on github.com, the same file Windows Package Manager installs. You can verify the downloaded file by comparing its SHA-256 checksum with 4c2f2530896d044260db8bdcaa8ab1f43b8917204cad495a5c09d0c60331760b.
wamr runs on Windows and is available for 64-bit (x64), ARM64 systems.
Open Settings › Apps › Installed apps, find wamr and select Uninstall. From the command line, run winget uninstall --id=cataggar.wamr -e.
Yes. wamr is available as a portable ZIP archive (wamr-3.0.0-dev.13-windows-x64.zip, 64-bit (x64)) that runs without installation. Copy it to any folder or USB drive and run it from there.
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