Learn ECMAScript - Second Edition

Fixing one billion count with atomics

Now we know the reason for our garbage value, and, with atomics, it should be easy to fix the problem. Right? Wrong.

There is a massive performance penalty on using atomic locking a billion times. Let's look at our updated worker.js code now:

// worker.jslet sharedMem;addEventListener('message', ({data}) => {  //console.log(data);    if(data.message == 'sab') {        sharedMem = data.memory;        console.log('Memory ready');    }    if(data.cmd == 'start') {      console.log('Iterations ready');        startCounting(data.iterations);    }});function startCounting(limit) {    const arr = new Uint32Array(sharedMem);    for(let i=0;i<limit;i++) {        Atomics.add(arr, 0, 1);    }    postMessage('done')}

This is similar to our previous implementation of the ...