example/arraybuffer_benchmark.html

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<html>
<head>
<title>ArrayBuffer benchmark</title>
<script src="util.js"></script>
<script>
var PRINT_SIZE = true;

// Initial size of arrays.
var START_SIZE = 10 * 1024;
// Stops benchmark when the size of an array exceeds this threshold.
var STOP_THRESHOLD = 100000 * 1024;
// If the size of each array is small, write/read the array multiple times
// until the sum of sizes reaches this threshold.
var MIN_TOTAL = 100000 * 1024;
var MULTIPLIERS = [5, 2];

// Repeat benchmark for several times to measure performance of optimized
// (such as JIT) run.
var REPEAT_FOR_WARMUP = 3;

function writeBenchmark(size, minTotal) {
  var totalSize = 0;
  while (totalSize < minTotal) {
    var arrayBuffer = new ArrayBuffer(size);

    // Write 'a's.
    fillArrayBuffer(arrayBuffer, 0x61);

    totalSize += size;
  }
  return totalSize;
}

function readBenchmark(size, minTotal) {
  var totalSize = 0;
  while (totalSize < minTotal) {
    var arrayBuffer = new ArrayBuffer(size);

    if (!verifyArrayBuffer(arrayBuffer, 0x00)) {
      queueLog('Verification failed');
      return -1;
    }

    totalSize += size;
  }
  return totalSize;
}

function runBenchmark(benchmarkFunction,
                      size,
                      stopThreshold,
                      minTotal,
                      multipliers,
                      multiplierIndex) {
  while (size <= stopThreshold) {
    var maxSpeed = 0;

    for (var i = 0; i < REPEAT_FOR_WARMUP; ++i) {
      var startTimeInMs = getTimeStamp();

      var totalSize = benchmarkFunction(size, minTotal);

      maxSpeed = Math.max(maxSpeed,
                          calculateSpeedInKB(totalSize, startTimeInMs));
    }
    queueLog(formatResultInKiB(size, maxSpeed, PRINT_SIZE));

    size *= multipliers[multiplierIndex];
    multiplierIndex = (multiplierIndex + 1) % multipliers.length;
  }
}

function runBenchmarks() {
  queueLog('Message size in KiB, Speed in kB/s');

  queueLog('Write benchmark');
  runBenchmark(
      writeBenchmark, START_SIZE, STOP_THRESHOLD, MIN_TOTAL, MULTIPLIERS, 0);
  queueLog('Finished');

  queueLog('Read benchmark');
  runBenchmark(
      readBenchmark, START_SIZE, STOP_THRESHOLD, MIN_TOTAL, MULTIPLIERS, 0);
  addToLog('Finished');
}

function init() {
  logBox = document.getElementById('log');

  queueLog(window.navigator.userAgent.toLowerCase());

  addToLog('Started...');

  setTimeout(runBenchmarks, 0);
}

</script>
</head>
<body onload="init()">
<textarea
    id="log" rows="50" style="width: 100%" readonly></textarea>
</body>
</html>