[JST] Parallelism comparison - JSFiddle

HTML

xxxxxxxxxx
 
<h3>Compare WebWorker and setTimeout-based parallelism</h3>
<table cellpadding="5" border="1">
  <tr>
    <td></td>
    <td>Value</td>
    <td>Time</td>
  </tr>
  <tr>
    <td>WebWorker</td>
    <td id=webWorkerValue></td>
    <td id=webWorkerTime></td>
  </tr>
  <tr>
    <td>setTimeout</td>
    <td id=setTimeoutValue></td>
    <td id=setTimeoutTime></td>
  </tr>
</table>
<button id=compareButton>Compare</button>
​

JavaScript

Module

xxxxxxxxxx
 
// Some magic to run function as WebWorker
compareButton.onclick = function() {
  webWorkerValue.innerHTML = "";
  webWorkerTime.innerHTML = "";
  setTimeoutValue.innerHTML = "";
  setTimeoutTime.innerHTML = "";
​
  var workerMessage = {
    iterationCount: 400000000,
    splitInterval:  2000000
  };
  calculatePiUsingWebWorker(workerMessage);
  calculatePiUsingSetTimeout(workerMessage);
};
​
function calculatePiUsingWebWorker(workerMessage) {
  var workerBlob = new Blob(["(" + workerImplementation.toString() + ")()"], {
    type: 'text/javascript'
  });
  var workerInstance = new Worker(URL.createObjectURL(workerBlob));
  workerInstance.onmessage = createMessageHandler(webWorkerValue, webWorkerTime);
  workerInstance.postMessage(workerMessage);
}
​
function calculatePiUsingSetTimeout(workerMessage) {
  var workerInstance = new workerImplementation(true);
  workerInstance.postMessage = function(data) {
    createMessageHandler(setTimeoutValue, setTimeoutTime)({ data: data });
  };
  workerInstance.onmessage({ data: workerMessage });
}
​
function workerImplementation(isSetTimeoutCase) {
  var response = {},
    self = this,
    iterationCount, splitInterval;
  this.onmessage = function(e) {
    iterationCount = e.data.iterationCount;
    splitInterval = e.data.splitInterval;
​
    function calculatePi(pi, startN, iterationCount, splitInterval) {
      for (var n = startN; n < iterationCount; n += 4) {
        pi = pi + (4 / n) - (4 / (n + 2));
​
        if (n > startN + splitInterval) {
          if (isSetTimeoutCase) {
            setTimeout(function() {
              calculatePi(pi, n + 4, iterationCount, splitInterval);
            });
          } else {
            calculatePi(pi, n + 4, iterationCount, splitInterval);
          }
          return;
        }
      }
​
      response.end = performance.now();
      response.pi = pi
      self.postMessage(response);
    }
​
    response.start = performance.now();
    calculatePi(0, 1, iterationCount, splitInterval);
  };
}
​
function createMessageHandler(valueHolder, timeHolder) {
  return function(e) {
    valueHolder.innerHTML = e.data.pi;
    timeHolder.innerHTML = e.data.end - e.data.start;
  }
}
​

CSS

xxxxxxxxxx
 
td {
  width: 150px;
}
​
button {
  margin-top: 20px;
}
​

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