makepad/relax
Relax Rust JIT
From the publisher
README & documentation
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rustc builds your program, then you run it. Relax runs your program while it builds it. Relax is a live compiler and JIT runtime for Rust, written in Rust. It runs a Cargo package straight from source, with no rustc, LLVM or linker in the loop: it compiles each function when it is first called, optimises the hot ones while the program runs, and patches your edits into the running process. Code generation for x86-64 and AArch64; from a fresh clone the repository builds and its tests pass on Linux x86-64 and macOS arm64. Windows isn't tested. and 1.24× on arm64 (geomean of 21 workloads), 1.22× and 1.25× against a native-CPU build. It is faster on only a few workloads: see where LLVM still wins. process, and JIT code is append-only. relax inspect memory shows the split, code the growth. The code cache in a package's target/relax takes 120 to…
Read the full README ↗ · Preview checked 2026-11-14T15:39:57.771Z
Inside the original README — Document outline
- Relax
- Rust without the wait.
- Relax vs cargo and rustc
- The tradeoffs
- What you get from a JIT
- Try it
- What it took: a new Rust toolchain
- How Makepad uses Relax
- Built for AI agents
- Where LLVM still wins
- Architecture
- Repository layout
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What this repository does
Relax Rust JIT
Repository facts
- Owner
- makepad
- Primary language
- Rust
- Stars
- 523
- Forks
- 27
- Open issues + pull requests
- 7
- License
- MIT
- Archived
- No
- Default branch
- main
- Created
- 2026-11-11T19:12:58.000Z
- Last push
- 2026-11-14T11:33:40.000Z
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