99 lines
2.9 KiB
JavaScript
99 lines
2.9 KiB
JavaScript
/**
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* @author mrdoob / http://mrdoob.com/
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* @author jetienne / http://jetienne.com/
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* @author paulirish / http://paulirish.com/
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*/
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var MemoryStats = function (){
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var msMin = 100;
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var msMax = 0;
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var container = document.createElement( 'div' );
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container.id = 'stats';
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container.style.cssText = 'width:80px;opacity:0.9;cursor:pointer';
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var msDiv = document.createElement( 'div' );
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msDiv.id = 'ms';
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msDiv.style.cssText = 'padding:0 0 3px 3px;text-align:left;background-color:#020;';
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container.appendChild( msDiv );
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var msText = document.createElement( 'div' );
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msText.id = 'msText';
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msText.style.cssText = 'color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px';
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msText.innerHTML= 'Memory';
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msDiv.appendChild( msText );
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var msGraph = document.createElement( 'div' );
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msGraph.id = 'msGraph';
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msGraph.style.cssText = 'position:relative;width:74px;height:30px;background-color:#0f0';
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msDiv.appendChild( msGraph );
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while ( msGraph.children.length < 74 ) {
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var bar = document.createElement( 'span' );
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bar.style.cssText = 'width:1px;height:30px;float:left;background-color:#131';
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msGraph.appendChild( bar );
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}
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var updateGraph = function ( dom, height, color ) {
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var child = dom.appendChild( dom.firstChild );
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child.style.height = height + 'px';
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if( color ) child.style.backgroundColor = color;
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}
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var perf = window.performance || {};
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// polyfill usedJSHeapSize
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if (!perf.memory){
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perf.memory = { usedJSHeapSize : 0 };
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}
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// support of the API?
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if( perf.memory.totalJSHeapSize === 0 ){
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console.warn('totalJSHeapSize === 0... performance.memory is only available in Chrome .')
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}
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// TODO, add a sanity check to see if values are bucketed.
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// If so, remind user to adopt the --enable-precise-memory-info flag.
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// open -a "/Applications/Google Chrome.app" --args --enable-precise-memory-info
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var lastTime = Date.now();
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var lastUsedHeap= perf.memory.usedJSHeapSize;
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return {
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domElement: container,
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update: function () {
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// refresh only 30time per second
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if( Date.now() - lastTime < 1000/30 ) return;
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lastTime = Date.now()
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var delta = perf.memory.usedJSHeapSize - lastUsedHeap;
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lastUsedHeap = perf.memory.usedJSHeapSize;
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var color = delta < 0 ? '#830' : '#131';
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var ms = perf.memory.usedJSHeapSize;
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msMin = Math.min( msMin, ms );
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msMax = Math.max( msMax, ms );
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msText.textContent = "Mem: " + bytesToSize(ms, 2);
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var normValue = ms / (30*1024*1024);
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var height = Math.min( 30, 30 - normValue * 30 );
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updateGraph( msGraph, height, color);
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function bytesToSize( bytes, nFractDigit ){
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var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
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if (bytes == 0) return 'n/a';
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nFractDigit = nFractDigit !== undefined ? nFractDigit : 0;
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var precision = Math.pow(10, nFractDigit);
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var i = Math.floor(Math.log(bytes) / Math.log(1024));
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return Math.round(bytes*precision / Math.pow(1024, i))/precision + ' ' + sizes[i];
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};
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}
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}
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};
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