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.js
let 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 problem, with...