Comments (2)
dicej
commented on August 11, 2024
1
Hi @tiagoernst. You are correct that performance is not nearly as good as with NodeJS. spin-js-sdk is based on QuickJS, which is reasonably efficient as JS interpreters go but not nearly as efficient as a modern JIT-based JS runtime such as V8 (which is what NodeJS is based on). Here's a good comparison for reference: https://bellard.org/quickjs/bench.html.
spin-js-sdk does not compile JS to WebAssembly -- it merely bundles your JS code with the QuickJS interpreter, using the latter to interpret the former at runtime. Hence performance is no better than if you were to run your JS code in QuickJS natively.
There is ongoing work at Igalia and Fastly to improve JS-on-Wasm performance via certain AOT-compilation strategies, and we intend to adopt the results of that work when it's ready. Meanwhile, JS-on-Wasm is probably not a great choice for CPU-bound apps.
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tiagoernst
commented on August 11, 2024
Very clear! Thanks for the info 🙂
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