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POMemory gradually increased using d3 for real time chart?
 

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  1. POMemory gradually increased using d3 for real time chart?
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    <p>I tried to simulate a real time chart with dynamic data using <code>d3.js</code>. I am running this using IE-10 browser.</p> <p><a href="https://drive.google.com/file/d/0B6wTfkJvzke_YlUtTkR4dktpS3M/edit?usp=sharing" rel="nofollow">My Source Code</a></p> <p>I come across to a problem where the memory of my IE browser will be gradually increased if left the web application running for a period of time.</p> <p>I Google searched the possible reason that caused this problem. </p> <p>Two things come into my mind for discussion:</p> <ol> <li><p>The timer prevents the garbage collection of IE</p></li> <li><p>The d3 chart does not release memory after <code>data.shift()</code></p></li> </ol> <p><strong>My question:</strong></p> <ol> <li><p>How could I diagnose if my problem actually originated from discussion 1 or 2 or neither?</p></li> <li><p>How could I solve the memory problem?</p></li> </ol> <p>You might need to download the code and run it with some time and monitor the <code>iexplorer.exe</code> using resource monitor in order to identify the problem.</p> <p>Thank you.</p> <p>Source Code:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;Animated Sparkline using SVG Path and d3.js&lt;/title&gt; &lt;script src="http://mbostock.github.com/d3/d3.v2.js"&gt;&lt;/script&gt; &lt;style&gt; /* tell the SVG path to be a thin blue line without any area fill */ path { stroke: steelblue; stroke-width: 1; fill: none; } &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;span&gt; &lt;b&gt;Size:&lt;/b&gt; 300x30 &amp;nbsp;&amp;nbsp;&lt;b&gt;Interpolation:&lt;/b&gt; basis &amp;nbsp;&amp;nbsp;&lt;b&gt;Animation:&lt;/b&gt; true &amp;nbsp;&amp;nbsp;&lt;b&gt;Transition:&lt;/b&gt; 1000ms &amp;nbsp;&amp;nbsp;&lt;b&gt;Update Frequency:&lt;/b&gt; 1000ms &lt;div id="graph1" class="aGraph" style="width:300px; height:30px;"&gt;&lt;/div&gt; &lt;/span&gt; &lt;script&gt; var myTimer; function FeedDataToChart(id, width, height, interpolation, animate, updateDelay, transitionDelay, data, startIndex) { // create an SVG element inside the #graph div that fills 100% of the div var graph = d3.select(id).append("svg:svg").attr("width", "80%").attr("height", "80%"); // X scale will fit values from 0-10 within pixels 0-100 var x = d3.scale.linear().domain([0, 48]).range([10, width-10]); // starting point is -5 so the first value doesn't show and slides off the edge as part of the transition // Y scale will fit values from 0-10 within pixels 0-100 var y = d3.scale.linear().domain([0, 20]).range([height-10, 10]); // create a line object that represents the SVN line we're creating var line = d3.svg.line() // assign the X function to plot our line as we wish .x(function(d,i) { // verbose logging to show what's actually being done //console.log('Plotting X value for data point: ' + d + ' using index: ' + i + ' to be at: ' + x(i) + ' using our xScale.'); // return the X coordinate where we want to plot this datapoint return x(i); }) .y(function(d) { // verbose logging to show what's actually being done //console.log('Plotting Y value for data point: ' + d + ' to be at: ' + y(d) + " using our yScale."); // return the Y coordinate where we want to plot this datapoint return y(d); }) .interpolate(interpolation) var counter = startIndex; //var myData = data.slice(); // display the line by appending an svg:path element with the data line we created above graph.append("svg:path").attr("d", line(data)); // or it can be done like this function redrawWithAnimation() { // update with animation graph.selectAll("path") .data([data]) // set the new data .attr("transform", "translate(" + x(1) + ")") // set the transform to the right by x(1) pixels (6 for the scale we've set) to hide the new value .attr("d", line) // apply the new data values ... but the new value is hidden at this point off the right of the canvas .transition() // start a transition to bring the new value into view .ease("linear") .duration(transitionDelay) // for this demo we want a continual slide so set this to the same as the setInterval amount below .attr("transform", "translate(" + x(0) + ")"); // animate a slide to the left back to x(0) pixels to reveal the new value } function redrawWithoutAnimation() { // static update without animation graph.selectAll("path") .data([data]) // set the new data .attr("d", line); // apply the new data values } function stopTimer() { clearInterval(myTimer); myTimer = null; graph.selectAll("path").data([data]).remove().append("svg:path").attr("d", line); buffer = null; signalGenerator(); } function startTimer() { if (myTimer == null) { myTimer = setInterval(function() { if (counter &lt; data.length - 1) { var v = data.shift(); // remove the first element of the array data.push(v); // add a new element to the array (we're just taking the number we just shifted off the front and appending to the end) if(animate) { redrawWithAnimation(); } else { redrawWithoutAnimation(); } counter++; } else { //alert("no more data in buffer"); stopTimer(); counter = startIndex; } }, updateDelay); } } startTimer(); } var buffer; function signalGenerator() { if (buffer == null) { buffer = new Array(100); var i; for (i = 0; i &lt; buffer.length; i++) { buffer[i] = Math.random() * 10; } FeedDataToChart("#graph1", 300, 300, "basis", true, 100, 100, buffer, 0); } } function startGenerator() { signalGenerator(); } startGenerator(); &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. COI don't know honestly if the amount of data could be it, but you could try removing unused/old data from the dataset and see how it goes. (Also I couldn't try running it on my machine since I'm on OSX)
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    2. COI think my source can run at chrome as well
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    3. COI left it running for 5 minutes or so(the bar covered the whole x axis and some data went out of the screen), didn't see any increased memory usage in my activity monitor using Safari
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