Very fast endless loop without I / O lock

Question

Is there a faster alternative window.requestAnimationFrame()for infinite loops that don't block I / O?

What I am doing in the loop is not related to animation, so I don’t care when the next frame is ready, and I read that it is window.requestAnimationFrame()limited by the refresh rate of the monitor or at least waits until the frame can be taken.

I also tried the following:

function myLoop() {
    // stuff in loop
    setTimeout(myLoop, 4);
}

(4 is because this is the minimum interval in setTimeout, and lower defaults will be 4.) However, I need a better resolution than this.

Is there anything with even better performance?

I basically need a non-blocking version while(true).

Answer 1

, , setTimeout:

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, setInterval :

let counter = 0;

// setInterval schedules macrotasks
let timer = setInterval(() => {
  $("#ticker").text(++counter);
}, 100);

// Interrupt it
$("#hog").on("click", function() {
  let x = 300000;

  // Queue a single microtask at the start
  Promise.resolve().then(() => console.log(Date.now(), "Begin"));

  // `next` schedules a 300k microtasks (promise settlement
  // notifications), which jump ahead of the next task in the main
  // task queue; then we add one at the end to say we're done
  next().then(() => console.log(Date.now(), "End"));

  function next() {
    if (--x > 0) {
      if (x === 150000) {
        // In the middle; queue one in the middle
        Promise.resolve().then(function() {
          console.log(Date.now(), "Middle");
        });
      }
      return Promise.resolve().then(next);
    } else {
      return 0;
    }
  }
});

$("#stop").on("click", function() {
  clearInterval(timer);
});

<div id="ticker">&nbsp;</div>
<div><input id="stop" type="button" value="Stop"></div>
<div><input id="hog" type="button" value="Hog"></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Hide result

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Answer 2

, cron, https://www.npmjs.com/package/node-cron

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