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PONumber of Web Workers Limit
 

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    <p><strong>PROBLEM</strong></p> <p>I've discovered that there is a limit on the number of Web Workers that can be spawned by a browser.</p> <p><strong>Example</strong></p> <p>main HTML / JavaScript</p> <pre><code>&lt;script type="text/javascript"&gt; $(document).ready(function(){ var workers = new Array(); var worker_index = 0; for (var i=0; i &lt; 25; i++) { workers[worker_index] = new Worker('test.worker.js'); workers[worker_index].onmessage = function(event) { $("#debug").append('worker.onmessage i = ' + event.data + "&lt;br&gt;"); }; workers[worker_index].postMessage(i); // start the worker. worker_index++; } }); &lt;/head&gt; &lt;body&gt; &lt;div id="debug"&gt; &lt;/div&gt; </code></pre> <p>test.worker.js</p> <pre><code>self.onmessage = function(event) { var i = event.data; self.postMessage(i); }; </code></pre> <p>This will generate only 20 output lines in the container when using Firefox (version 14.0.1, Windows 7). </p> <p><strong>QUESTION</strong></p> <p>Is there a way around this? The only two ideas I can think of are:</p> <p>1) Daisy chaining the web workers, i.e., making each web worker spawn the next one</p> <p>Example:</p> <pre><code>&lt;script type="text/javascript"&gt; $(document).ready(function(){ createWorker(0); }); function createWorker(i) { var worker = new Worker('test.worker.js'); worker.onmessage = function(event) { var index = event.data; $("#debug").append('worker.onmessage i = ' + index + "&lt;br&gt;"); if ( index &lt; 25) { index++; createWorker(index); } }; worker.postMessage(i); // start the worker. } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="debug"&gt;&lt;/div&gt; </code></pre> <p>2) Limit the number of web workers to a finite number and modify my code to work with that limit (i.e., share the work load across a finite number of web workers) - something like this: <a href="http://www.smartjava.org/content/html5-easily-parallelize-jobs-using-web-workers-and-threadpool" rel="noreferrer">http://www.smartjava.org/content/html5-easily-parallelize-jobs-using-web-workers-and-threadpool</a></p> <p>Unfortunately #1 doesn't seem to work (only a finite number of web workers will get spawned on a page load). Are there any other solutions I should consider?</p>
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    1. CODo you encounter this limit in other browsers, too? If not, please tag your question with FF.
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    2. COEach browser has web workers limitations (Firefox has 20, Chrome 60+, Opera 16); however, you can change it in Firefox -> dom.workers.maxPerDomain; as for your actual question, if you can or cannot avoid this limitation, I'm not sure. "Workers (as these background scripts are called herein) are relatively heavy-weight, and are not intended to be used in large numbers." Can you give an exact situation where you would want to use more than 20 workers?
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    3. COhave a look [here](http://stackoverflow.com/questions/9339892/does-a-firefox-workers-limit-exist).
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