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  <title>hardwareConcurrency — pool</title>
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  <pre id="out"></pre>
  <script>
    var workerList = [];
    for (var i = 0; i < navigator.hardwareConcurrency; i++) {
      workerList.push({ id: i, inUse: false });
    }
    document.getElementById("out").textContent =
      "planned workers: " + workerList.length +
      "\n" + JSON.stringify(workerList.slice(0, 3), null, 2);
  </script>
</body>
</html>

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hardwareConcurrency — Worker pool plan (Try It)