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bytecodealliance/wasmtime

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A lightweight WebAssembly runtime that is fast, secure, and standards-compliant

102 mentions on Hacker News by 92 people: 9 stories, 93 comments · first 2018-12-12 · latest 2026-07-25

Mentions per year 102 mentions · busiest year 2022 (23)
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  1. …found the list of open stack-switching issues[3] useful. (also, minor nit - Wasm != Wasmtime) [0]: https://github.com/bytecodealliance/wasmtime/issues/10248 [1]: https://github.com/bytecodealliance/wasmtime/issues/12941 [2]:…
    comment by boomskats · 2026-07-25 · in GC and Exceptions in Wasmtime
  2. …they can run `wasmtime pdfconverter.wasi input.pdf output.pdf` from the command line (see https://github.com/bytecodealliance/wasmtime/blob/main/docs/... for details). In addition to the web site, the Electron app and the Chrome extension,…
    comment by ptspts · 2026-01-19 · in Show HN: Pdfwithlove – PDF tools that run 100% locally (no uploads, no back end)
  3. …There are also codegen projects that don't use LLVM IR that are faster like Cranelift: https://github.com/bytecodealliance/wasmtime/tree/main/crane...
    comment by circuit10 · 2026-01-12 · in LLVM: The bad parts
  4. …for example, this file, which implements part of the instruction generation logic for x64: https://github.com/bytecodealliance/wasmtime/blob/main/crane... Copy-and-patch is a technique for reducing the amount of effort it takes to write a…
    comment by IainIreland · 2025-10-14 · in Copy-and-Patch: A Copy-and-Patch Tutorial
  5. …has a clear pathway for doing so, for example Wasmtime still doesn't implement that functionality: https://github.com/bytecodealliance/wasmtime/issues/3017
    comment by kragen · 2025-09-05 · in Fil's Unbelievable Garbage Collector
  6. …model. That’s worse than the JVM. (It seems like they want to implement one… someday. It’s vague: https://github.com/bytecodealliance/wasmtime/blob/main/docs/... )
    comment by rafram · 2025-07-30 · in Microsoft Flight Simulator 2024: WebAssembly SDK
  7. That is amazing news! Thank you. https://github.com/bytecodealliance/wasmtime/blob/main/pulle...
    comment by sitkack · 2025-06-11 · in Show HN: Munal OS: a graphical experimental OS with WASM sandboxing
  8. …mechanisms. Turning epochs on should be trivial if your system provides any sort of concurrency: https://github.com/bytecodealliance/wasmtime/blob/main/examp...
    comment by phickey · 2025-06-09 · in Show HN: Munal OS: a graphical experimental OS with WASM sandboxing
  9. …every once in a while? This probably makes no sense, ignore it, I'm way in over my head. [1] https://github.com/bytecodealliance/wasmtime/issues/4109 [2] https://github.com/bytecodealliance/wasmtime/blob/main/examp...
    comment by 9d · 2025-06-09 · in Show HN: Munal OS: a graphical experimental OS with WASM sandboxing
  10. I think I was a bit spooked by the examples ( https://github.com/bytecodealliance/wasmtime/tree/main/examp... ), and the need to implement platform dependencies in C code (which would have complicated the build process). Makes sense since…
    comment by Gazoche · 2025-06-09 · in Show HN: Munal OS: a graphical experimental OS with WASM sandboxing
  11. …the maintainers, myself included, created and are using in production at their day jobs. More info: https://github.com/bytecodealliance/wasmtime/issues/8036 Several folks have volunteered work on the C bindings over the last year or two,…
    comment by phickey · 2025-05-21 · in Roto: A Compiled Scripting Language for Rust
  12. Yes: Go: https://go.dev/blog/wasi Rust: https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by xena · 2025-03-03 · in Yoke: Infrastructure as code, but actually
  13. …It is of comparable size and actually includes 12kloc of documentation, not just comments. https://github.com/bytecodealliance/wasmtime/tree/main/crane...
    comment by sitkack · 2025-02-21 · in TinyCompiler: A compiler in a week-end
  14. …is open to end users, they won't be able to crash your application shell. https://wasmtime.dev/ https://github.com/bytecodealliance/wasmtime
    comment by sitkack · 2025-01-25 · in Wild – A fast linker for Linux
  15. …full x86-64 ABI for C99. [1] https://github.com/michaelforney/cproc?tab=readme-ov-file#wh... [2] https://github.com/bytecodealliance/wasmtime/issues/1030
    comment by fuhsnn · 2025-01-24 · in Tilde, My LLVM Alternative
  16. You should look at embedding Wasmtime into your C. https://github.com/bytecodealliance/wasmtime/tree/main/examp...
    comment by sitkack · 2024-11-20 · in Query Your Python Lists
  17. …s://github.com/WebAssembly/component-model/blob/5a34794d... [2] https://github.com/WebAssembly/gc [3] https://github.com/bytecodealliance/wasmtime/blob/ba8131c6bf... [4] https://www.digitalocean.com/community/tutorials/java-classl...
    comment by no_circuit · 2024-11-13 · in Spin 3.0 – open-source tooling for building and running WASM apps
  18. …hole (though SIMD in Rust is usually very annoying to write) Best of luck, hope this helps! [0] https://github.com/bytecodealliance/wasmtime/blob/7dcb9bd6ea...
    comment by luizfelberti · 2024-07-24 · in Ask HN: Fast data structures for disjoint intervals?
  19. Just a documentation change, fortunately: https://github.com/bytecodealliance/wasmtime/commits?author=... They've submitted little documentation tweaks to other projects, too; for example: https://learn.microsoft.com/en-us/cpp/overview/what…
    comment by mintplant · 2024-03-29 · in Backdoor in upstream xz/liblzma leading to SSH server compromise
  20. As far as I know, you should be able to generate textual CLIF files and feed them to Cranelift: https://github.com/bytecodealliance/wasmtime/blob/main/crane...
    comment by kibwen · 2024-03-18 · in Cranelift code generation comes to Rust
  21. …try some of my favorites: https://github.com/wasm3/wasm3 , https://github.com/WebAssembly/wabt , https://github.com/bytecodealliance/wasmtime
    comment by TachyonicBytes · 2024-01-08 · in Show HN: Auto Wiki – Turn your codebase into a Wiki
  22. …you say wasm container, you mean something like wasmtime that provides a non-browser wasm runtime? https://github.com/bytecodealliance/wasmtime
    comment by gpm · 2024-01-08 · in MotorOS: a Rust-first operating system for x64 VMs
  23. …[2] https://bytecodealliance.org/articles/webassembly-the-update... [3] https://github.com/bytecodealliance/wasmtime/pull/7285 [4] https://github.com/WebAssembly/shared-everything-threads
    comment by slimsag · 2023-11-27 · in $20k bounty was claimed
  24. …have pre-built binaries for. Specifically, we could run on all platforms Wasmtime supports today ( https://github.com/bytecodealliance/wasmtime/releases/tag/v1... ), including RISC and S390X, for example. And while we have been…
    comment by matei_radu · 2023-11-06 · in Spin 2.0 – open-source tool for building and running WASM apps
  25. …status-quo-reinforcing regressive single-runtime-backed alternatives win in the meantime.) [0]: https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by Philpax · 2023-10-22 · in Dave Cutler on Windows [video]
  26. …[2]: https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#... [3]: https://github.com/bytecodealliance/wasmtime/pull/2611 [4]: https://github.com/bytecodealliance/wasmtime/pull/3699
    comment by tombl · 2023-10-21 · in Should you be scared of Unix signals? (2016)
  27. …WasmTime finished the RFC for the implementation details in June: https://github.com/bytecodealliance/wasmtime/issues/5032
    comment by ReleaseCandidat · 2023-10-19 · in Requiem for a stringref
  28. Take your pick of runtimes. Wasmtime is the most popular right now. https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by ramesh31 · 2023-10-04 · in Extism makes WebAssembly easy
  29. re LLVM: Yes, Cranelift was designed to address these issues https://github.com/bytecodealliance/wasmtime/blob/main/crane... https://blog.benj.me/2021/02/17/cranelift-codegen-primer https://jason-williams.co.uk/posts/a-possible-new-backend-…
    comment by __s · 2023-09-21 · in MongoDB’s new query engine
  30. …break all security, or at least not by default. Here's a document about capabilities-based design: https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by skybrian · 2023-09-13 · in WASI Support in Go
  31. …systems up to beefy arm/x86 racks: - https://github.com/bytecodealliance/wasm-micro-runtime - https://github.com/bytecodealliance/wasmtime - https://github.com/wasmerio/wasmer - https://github.com/tetratelabs/wazero -…
    comment by nilslice · 2023-07-19 · in Val, a high-level systems programming language
  32. …It's written in Rust and can be used from Go [2] but requires CGo (as mentioned by GP). [1] https://github.com/bytecodealliance/wasmtime [2] https://github.com/bytecodealliance/wasmtime-go
    comment by alecthomas · 2023-07-01 · in Wazero: Zero dependency WebAssembly runtime written in Go
  33. https://github.com/bytecodealliance/wasmtime/blob/main/crane...
    comment by steveklabnik · 2023-06-23 · in Making C++ safe without borrow checking, reference counting, or tracing GC
  34. Assuming you are serious, there is https://github.com/bytecodealliance/wasmtime/tree/main/crane... which is written in Rust and is targeted to become the default debug backend in rustc. LLVM has accumulated a lot of optimizations…
    comment by Voultapher · 2023-06-23 · in Making C++ safe without borrow checking, reference counting, or tracing GC
  35. …is well underway and the initial implementation is scheduled to land in wasmtime this June. https://github.com/bytecodealliance/wasmtime/issues/6370
    comment by dbfa · 2023-05-30 · in WASIX, the Superset of WASI Supporting Threads, Processes and Sockets
  36. …for whole functions/packages. [1] https://github.com/vmware-labs/webassembly-language-runtimes [2] https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by zifeo · 2023-05-17 · in Show HN: Metatype – an open-source HTTP/GraphQL query engine for APIs/data/WASM
  37. Permalink: https://github.com/bytecodealliance/wasmtime/blob/8eccc63c46... .
    comment by throwaway525142 · 2023-05-01 · in VSCode-WASM: Implement a first version of a WebShell
  38. …sockets, clocks, and random numbers, that we'll be proposing for standardization. Read more here - https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by nindalf · 2023-05-01 · in VSCode-WASM: Implement a first version of a WebShell
  39. …(WASI). WASI's design has been inspired by CloudABI. https://github.com/NuxiNL/cloudlibc edit: https://github.com/bytecodealliance/wasmtime/blob/main/docs/... is a good reference and also mentions the Capsicum framework (…
    comment by aduitsis · 2023-03-24 · in The tug-of-war over server-side WebAssembly
  40. This actually seems to be experimentally supported by some runtimes, like wasmtime[0]. [0]: https://github.com/bytecodealliance/wasmtime/pull/3153
    comment by cube2222 · 2023-01-21 · in Kernel-WASM: Sandboxed kernel mode WebAssembly runtime for Linux
  41. I believe this is what WASI is https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by peterhunt · 2022-12-21 · in WebAssembly: Docker Without Containers
  42. Support on the server side is planned, still waiting for standardization https://github.com/bytecodealliance/wasmtime/issues/888
    comment by ridruejo · 2022-12-21 · in WebAssembly: Docker Without Containers
  43. …and capability security (which I gather from a glance here that wasmtime is using on some level https://github.com/bytecodealliance/wasmtime/blob/main/docs/... ): https://groups.google.com/g/cap-talk/c/NSDM-05fEuU/
    comment by thingification · 2022-12-01 · in Extism: Make all software programmable with WebAssembly
  44. …about how it actually works. Wasmtime includes documentation on how to use their fuzzer, https://github.com/bytecodealliance/wasmtime/tree/main/fuzz In my cursory look at the WasmEdge codebase I see No application UBSan [1] No application…
    comment by nerpderp82 · 2022-11-30 · in WasmEdge
  45. …Cranelift [2]. If you mean addressing the poor quality of LLVM IR directly, then I don't know. [1]: https://github.com/bytecodealliance/wasmtime/blob/main/crane... [2]: https://github.com/bjorn3/rustc_codegen_cranelift
    comment by emi2k01 · 2022-10-27 · in How to speed up the Rust compiler in October 2022
  46. …binary is. It needs to run in a vm. Wasmtime is one such vm. In a browser context that vm is v8. https://github.com/bytecodealliance/wasmtime
    comment by lbhdc · 2022-10-03 · in mod_wasm: Run WebAssembly with Apache
  47. Nice job on the release… But still no multithreading? https://github.com/bytecodealliance/wasmtime/issues/888 It is strange to me to call it 1.0 without seamless threading support and while wasm & wasi still have standards to work out.…
    comment by survirtual · 2022-09-21 · in Wasmtime 1.0
  48. …it wouldn't be easy to just go and play with for fun, but the example is impressively simple: https://github.com/bytecodealliance/wasmtime#example Maybe I'll take it for a spin
    comment by brundolf · 2022-09-20 · in Wasmtime 1.0
  49. …compiler that supports it. [0] https://hacks.mozilla.org/2019/03/standardizing-wasi-a-webas... [1] https://github.com/bytecodealliance/wasmtime/blob/main/docs/...
    comment by afiori · 2022-06-16 · in Wasmer – Universal WebAssembly Runtime
  50. …-- to get the most mileage we can out of our efforts. It seems to be working OK so far! [0] https://github.com/bytecodealliance/wasmtime/blob/main/crane...
    comment by cfallin · 2022-06-10 · in Cranelift, Part 4: A New Register Allocator