Package Exports

event-loop-delay

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Readme

event-loop-delay

A minimal overhead event loop delay sampler.

npm install event-loop-delay

Bundles a prebuilt N-API addon that makes the overhead of the sampler very minimal (around 0.2% on my machine, ymmv).

If the addon fails for some reason a JS fallback is used with a bit higher overhead (around 1-2% on my machine).

Usage

const loopDelay = require('event-loop-delay')

const sampler = loopDelay()

setInterval(function () {
  console.log('Accumulated delay in ms is', sampler.delay)
  console.log('Accumulated times a delay was detected', sampler.times)
}, 1000)

setInterval(function () {
  for (let i = 0; i < 1e7; i++) {
    // simulate event loop blocking
  }
}, 3000)

Running the above should should the sampler meassuring the event loop delay.

API

`sampler = loopDelay()`

Make a new sampler. Will sample the event loop every 10ms.

`sampler.delay`

Accumulated event loop delay in ms meassured since sampler was created.

`sampler.times`

Accumulated times the event loop delay was detected.

`sampler.destroy()`

Destroys the sampler.

`sampler.native`

Boolean telling you if the native addon is used.

License

MIT