jitless nodejs

[darkmoon233]

We know v8 supports JavaScript execution without allocating executable memory at runtime.Is there any way i can use this feature in nodejs ?

I'm working for some benchmarks about wasm. I really need know whether node use jit when run wasm.

[targos]

You can enable JIT-less mode by running Node.js with the --jitless flag: node --jitless script.js

[darkmoon233]

I run node --jitless scripts.js and get an error: node: bad option: --jitless.
My node version is v10.16.0, my operation system is Ubuntu 18.042 LTS.

[targos]

It is only available since Node.js 12.0.0

[targos]

I think this is answered, but feel free to comment if you have more questions.

[darkmoon233]

It can't work when the Javascript file references a wasm file.

Some code about referencing a wasm file.

var wasmBinaryFile = 'a.out.wasm';
if (!isDataURI(wasmBinaryFile)) {
  wasmBinaryFile = locateFile(wasmBinaryFile);
}

I use emscritpten to compile my C++ file to JavaScript. Node.js can run the JavaScript file without --jitless.If i use command like node --jitless a.out.js ,i will get an error node: bad option: --jitless.

Is that mean Node.js can't deal with wasm without jit?

[devsnek]

That means you're still not on a version of node that supports jitless. Also worth noting, the WebAssembly global is removed in jitless mode because the wasm interpreter is not ready for production yet.

[darkmoon233]

Does this mean that no version of node is currently supported by wasm running without jit?

[devsnek]

@darkmoon233 correct.