ResourceLimits don't work for node:worker_threads

[josephrocca]

Version: Deno v2.0.0 (tested as far back as v1.41.3)

Below is a simplified version of this test:

• https://github.com/denoland/node_test/blob/main/test/parallel/test-worker-resource-limits.js

import worker_threads from 'node:worker_threads';
const worker = new worker_threads.Worker(new URL("./worker.mjs", import.meta.url), {
  resourceLimits: {
    maxYoungGenerationSizeMb: 4,
    maxOldGenerationSizeMb: 16,
    codeRangeSizeMb: 16,
    stackSizeMb: 1,
  },
});

And here's ./worker.mjs:

import { resourceLimits } from 'node:worker_threads';
console.log(resourceLimits);

In Node.js it logs this:

resourceLimits: {
  maxYoungGenerationSizeMb: 4,
  maxOldGenerationSizeMb: 16,
  codeRangeSizeMb: 16,
  stackSizeMb: 1
}

And a simple large string allocation test shows that the limit is respected - i.e. it crashes with FATAL ERROR: Reached heap limit Allocation failed if the limit is hit.

In Deno it logs the default values:

resourceLimits: {
  maxYoungGenerationSizeMb: 48,
  maxOldGenerationSizeMb: 2048,
  codeRangeSizeMb: 0,
  stackSizeMb: 4
}

Related Context:

• https://docs.deno.com/api/node/worker_threads/
• https://docs.deno.com/api/node/worker_threads/~/ResourceLimits

[lucacasonato]

@josephrocca Are you suggesting that Deno is respecting the set resource limits, but it is not showing the correct values? Or are you saying it does neither?