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David Alsh

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•Created by David Alsh on 11/14/2024 in #support

Is WebVM faster on x86_64 hosts compared to arm64 MacOS hosts?

I am evaluating WebVM as a tool to sandbox a "playground" environment for a internal company compiler tool as it allows us the ability to run unmodified linux-x86 (does it support 64 bit binaries?) binaries which simplifies our execution environment as compared to compiling the compiler to WASM and writing JavaScript bindings. One concern I have is that the performance is quite poor - but I have only had the chance to evaluate it on an M1 MacBook Pro host so I am wondering if x86 translation is the cause of this poor performance? Is WebVM faster on an x86_64 host? If so, are there plans to add support for linux-arm64 virtualization so arm hosts can perform better?

2 replies

DDeno

•Created by David Alsh on 3/8/2024 in #help

Rust: Unable to bootstrap MainWorker

My message was too long, moved it to a GitHub discussion: https://github.com/denoland/deno/discussions/22788

2 replies

DDeno

•Created by David Alsh on 1/29/2024 in #help

How to call a JS function from Rust?

Hi, I'd like to call a JS function from Rust but I can't seem to find an example that does so. I got this far with the examples and blog tutorials.

// index.js
function add(a, b) {
  return a + b
}

// Do I need these?
// globalThis.add = add
// export { add }

// index.js
function add(a, b) {
  return a + b
}

// Do I need these?
// globalThis.add = add
// export { add }

// main.rs
async fn main_async() {
  let main_module = resolve_path(
    "./index.js",
    env::current_dir().unwrap().join("js").as_path()
  ).unwrap();
  
  let mut js_runtime = JsRuntime::new(RuntimeOptions {
      module_loader: Some(Rc::new(FsModuleLoader)),
      ..Default::default()
  });

  let mod_id = js_runtime.load_main_module(&main_module, None).await.unwrap();

  let result = js_runtime.mod_evaluate(mod_id);
  
  js_runtime.run_event_loop(PollEventLoopOptions::default()).await.unwrap();
  
  result.await.unwrap();
}

fn main() {
  let runtime = tokio::runtime::Builder::new_current_thread()
    .enable_all()
    .build()
    .unwrap();
  runtime.block_on(main_async())
}

// main.rs
async fn main_async() {
  let main_module = resolve_path(
    "./index.js",
    env::current_dir().unwrap().join("js").as_path()
  ).unwrap();
  
  let mut js_runtime = JsRuntime::new(RuntimeOptions {
      module_loader: Some(Rc::new(FsModuleLoader)),
      ..Default::default()
  });

  let mod_id = js_runtime.load_main_module(&main_module, None).await.unwrap();

  let result = js_runtime.mod_evaluate(mod_id);
  
  js_runtime.run_event_loop(PollEventLoopOptions::default()).await.unwrap();
  
  result.await.unwrap();
}

fn main() {
  let runtime = tokio::runtime::Builder::new_current_thread()
    .enable_all()
    .build()
    .unwrap();
  runtime.block_on(main_async())
}

How can I call add(1, 2) from rust?

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