Created
April 3, 2013 22:39
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A little hacky effort at testing YUI javascript memory usage using Node.js and phantomjs
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| var util = require('util') | |
| http=require('http'), | |
| phantom=require('node-phantom'), | |
| // simple logging of memory use: | |
| memoryCache = [0], | |
| logMemory = function (msg) { | |
| var mem = process.memoryUsage(); | |
| //console.log(msg + " current memory use: ", util.inspect(process.memoryUsage())); | |
| console.log(msg + " heapUsed change: " + (mem.heapUsed - memoryCache[memoryCache.length - 1])); | |
| memoryCache.push(mem.heapUsed); | |
| }; | |
| console.log("hello, testing some memory."); | |
| logMemory("Start up"); | |
| // Serve a very boring page, with YUI seed and a bunch of spans | |
| var server = http.createServer(function (request,response) { | |
| response.writeHead(200,{"Content-Type": "text/html"}); | |
| var doc = '<html><head>' + | |
| '<title>Testing memory use</title>' + | |
| '<script src="http://yui.yahooapis.com/3.9.1/build/yui/yui-min.js"></script>' + | |
| '</head>' + | |
| '<body>' + | |
| '<h1>The original page</h1>', | |
| i = 0; | |
| for (; i < 500; i = i + 1) { | |
| doc += '<span class="t' + i + '">' + i + '</span>'; | |
| } | |
| //doc += '<script type="text/javascript">YUI();</script>'; | |
| doc += '</body></html>'; | |
| response.end(doc); | |
| }).listen(1337); | |
| logMemory("Server started"); | |
| // Use phantomjs to load the page we're serving above, inject some YUI-ness | |
| // and see what happens to the memory: | |
| phantom.create(function (err, ph) { | |
| ph.createPage(function(err,page){ | |
| logMemory("Create page"); | |
| page.open('http://localhost:1337', function (err,status) { | |
| logMemory("Page opened " + status); | |
| // findAllSpans does a Y.all("span") to create a bunch of (YUI) Node | |
| // instances | |
| page.injectJs('memtest/findAllSpans.js', function (err) { | |
| logMemory("Just injected js "); | |
| // the timeout is so that the YUI().use("node") can download | |
| // the required node modules from Yahoo and then call the callback | |
| // to do Y.all() | |
| setTimeout(function () { | |
| page.evaluate(function () { | |
| // Sanity check - the injected script modifies the h1 | |
| // to say how many spans it found (and how many Y.Node instances | |
| // there are) | |
| return document.getElementsByTagName('h1')[0].innerText; | |
| }, function (err, res) { | |
| console.log("h1 content: " + res); | |
| logMemory("After YUI.all has happened"); | |
| page.close(); | |
| logMemory("Page closed"); | |
| }); | |
| }, 10000); | |
| }); | |
| }); | |
| }); | |
| }); |
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