Node profiler, worker_threads+vm

/*
rm -rf ./profiling
node --cpu-prof --cpu-prof-dir=./profiling index.mjs
*/

import { fileURLToPath } from "node:url";
import vm from "node:vm";
import { Worker, isMainThread } from "node:worker_threads";

globalThis.variableInGlobalScope = "Hello world";

const code = `
function functionRunningInVm() {
    let sum = 0;
    for (const [i] of Array(50_000_000).fill(null).entries()) {
      sum += i;
    }
    console.log("sum in vm is", sum);
    return \`globalThis.variableInGlobalScope in vm is \${globalThis.variableInGlobalScope}\`;
}

console.log('Running functionRunningInVm');
functionRunningInVm();
`;

function functionRunningInMainThread() {
  let sum = 0;
  for (const [i] of Array(50_000_000).fill(null).entries()) {
    sum += i;
  }
  console.log("sum is", sum);
  return sum;
}

function functionRunningInWorkerThread() {
  let sum = 0;
  for (const [i] of Array(50_000_000).fill(null).entries()) {
    sum += i;
  }

  console.log("sum is", sum);
  return sum;
}

if (isMainThread) {
  const worker = new Worker(fileURLToPath(import.meta.url));
  worker.on("message", console.log);
  worker.on("error", console.error);
  worker.on("exit", console.log);

  functionRunningInMainThread();
} else {
  const output = vm.runInThisContext(code);
  console.log("output is", output);

  functionRunningInWorkerThread();
}