simd
exception-handling
simd | exception-handling | |
---|---|---|
5 | 7 | |
463 | 145 | |
- | 2.8% | |
8.8 | 6.8 | |
over 2 years ago | 8 days ago | |
WebAssembly | WebAssembly | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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simd
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The IMPOSSIBLE RISCV HACK: Vector Extension 0.7.1-draft w/ current Linux kernel! – René Rebe
I'd love to see OpenCL or WasmSIMD support for RVV 071.
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WASM vs Native Rust performance
Wasm SIMD supports only 128-bit registers, no? https://github.com/WebAssembly/simd/blob/a78b98a6899c9e91a13095e560767af6e99d98fd/proposals/simd/SIMD.md
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A Look at Performance in Wasmtime and Cranelift
According to the WebAssembly Roadmap, the 128-bit packed SIMD Extension proposal has been accepted and is already implemented in every major runtime except Safari, and the Relaxed SIMD proposal is planned, with Firefox already having an experimental implementation in nightly-channel builds.
- Pay Attention to WebAssembly
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There are many like it, but this is my Rust raytracer running in WebAssembly
Thanks! You're probably right about spatial filtering with a low sphere count. SIMD is supported, that looks to work in every recent browser except Safari. Looking forward to trying that out. A really quick search of wasm-bindgen docs don't reveal an interface to use that SIMD support though. I wonder if you can unsafely inline some raw wasm like you can with asm!
exception-handling
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Bring garbage collected programming languages efficiently to WebAssembly
Interesting article, thanks!
Notes on the issues mentioned there:
* The need for a manual shadow stack: This is fixed in WasmGC (in the same way it works in JS, as the link mentions).
* Lack of try-catch: This is fixed by the Wasm exception handling proposal, which has already shipped in browsers, https://github.com/WebAssembly/exception-handling/blob/main/...
* Null checks: Mostly fixed by WasmGC. The spec defines non-nullable local types, and VMs can use the techniques the article mentions to optimize them using signals (Wizard does, for example).
* Class initialization: This is a difficult problem, as the article says. J2Wasm and Binaryen are working to optimize it through static analysis at the toolchain level. Here is a recent PR I wrote that makes progress there: https://github.com/WebAssembly/binaryen/pull/6061
* The vtable overhead issue the article mentions may be a problem. I'm not aware of good measurements on it, through. There are some ideas on post-MVP solutions for method dispatch that might help, but nothing concrete yet.
* Checks for null and trapping: There has been discussion of variants on the GC instructions that throw instead of trap. Measurements, however, have not shown it to be a big problem atm, so it is low priority.
The author is right that stack walking, signals, and memory control are important areas that could help here.
Overall with WasmGC and exceptions we are in a pretty good place for Java as emitted by J2Wasm today: it is usually faster than J2CL which compiles Java to JavaScript. But there is definitely room for improvement.
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In the latest demo with Dart, WebAssembly and GC in Chrome how was the Exception Handling solved?
It uses https://github.com/WebAssembly/exception-handling/blob/master/proposals/exception-handling/Exceptions.md which is actually supported by all major browsers already.
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'The best thing we can do today to JavaScript is to retire it,' says JSON creator Douglas Crockford
Yep, you're right. It's also more than just the DOM, it's web APIs in general, such as fetch, audio, webgl/webgpu, etc. WASM still needs GC, exceptions, and WASI to be able to fully interop with any host without any of the current limitations. This'll take a few years. I'm looking forward to the future in which I will be shipping WASM-only web apps to my users.
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WebAssembly Everywhere
Its a part of the wasm plan to support gc https://github.com/WebAssembly/gc exceptions https://github.com/WebAssembly/exception-handling
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What's New in Node.js 17
As of Node.js 17, the v8 JavaScript engine has been updated to v9.5. The changes in this release are primarily aimed at expanding internationalization for dates and calendars as well as for the output of time zones. It also implements the WebAssembly Exception Handling proposal, designed to reduce overhead compared to current JavaScript-based workarounds.
- WebContainers: Run Node.js natively in the browser
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Google admits Kubernetes container tech is too complex
Agreed, although at some point in a not very far feature most of those missing features will resolved. So in my mind is just a matter of time. The Wasm Community group is doing an awesome work on that :)
Here are a few examples of what needs move forward in Wasm:
* [1] Wasm Exceptions Handling: Right now Wasm is missing a way to handle exceptions natively (C++ programs can only compile to Wasm using the asyncify or longjmp/setjmp tricks via Js try/catch)
* [2] Wasm GC: Wasm Binary files are quite big (specially in interpreted languages). This is partially caused by the GC being included in the Binary itself. The GC proposal will solve this while also providing faster execution.
* [3] Wasm 64-bit Memory: currently Wasm can only operate with 32-bit data. In some contexts you may want you operate with more than 4GB of memory (for example, when operating over terabytes of data). The 64-bit memory proposal will solve that.
[1]: https://github.com/WebAssembly/exception-handling
What are some alternatives?
gc - Branch of the spec repo scoped to discussion of GC integration in WebAssembly
Uno Platform - Build Mobile, Desktop and WebAssembly apps with C# and XAML. Today. Open source and professionally supported.
fast-math - Play fast and loose with IEEE-754 rewrite RULES
Flutter - Flutter makes it easy and fast to build beautiful apps for mobile and beyond
wasmer - 🚀 The leading Wasm Runtime supporting WASIX, WASI and Emscripten
schism - A self-hosting Scheme to WebAssembly compiler
multi-value - Proposal to add multi-values to WebAssembly
Dokku - A docker-powered PaaS that helps you build and manage the lifecycle of applications
design - WebAssembly Design Documents
webcontainer-core - Dev environments. In your web app.
wasi-libc - WASI libc implementation for WebAssembly
kubevious - Kubevious - Kubernetes without disasters