phantom-perf.js

   1 // dygraphs command-line performance benchmark.
   2 //
   3 // Invoke as:
   4 //
   5 //   phantomjs phantom-perf.js 1000 100 5
   6 //
   7 // If the test succeeds, it will print out something like:
   8 //
   9 //   1000/100/5: 1309.4+/-43.4 ms (1284, 1245, 1336, 1346, 1336)
  10 //
  11 // This is mean +/- standard deviation, followed by a list of the individual
  12 // times for each repetition, in milliseconds.
  13
  14 var system = require('system'),
  15     fs = require('fs');
  16
  17 var tmpfile = "tmp-dygraph-test-params.js";
  18 var url = 'tests/dygraph-many-points-benchmark.html';
  19
  20 function fail(msg){
  21   console.warn(msg);
  22   phantom.exit(1);
  23 }
  24
  25 function assert(condition, msg){
  26   if (condition) return;
  27   fail(msg);
  28 }
  29
  30 var config_file_template =
  31     "document.getElementById('points').value = (points);\n" +
  32     "document.getElementById('series').value = (series);\n" +
  33     "document.getElementById('repetitions').value = (repetitions);\n";
  34
  35 var RunBenchmark = function(points, series, repetitions, done_callback) {
  36   var page = require('webpage').create();
  37
  38   // page.evalute() is seriously locked down.
  39   // This was the only way I could find to pass the parameters to the page.
  40   fs.write(tmpfile,
  41       config_file_template
  42         .replace("(points)", points)
  43         .replace("(series)", series)
  44         .replace("(repetitions)", repetitions),
  45       "w");
  46
  47   page.open(url, function(status) {
  48     if (status !== 'success') {
  49       console.warn('Page status: ' + status);
  50       console.log(page);
  51       phantom.exit();
  52     }
  53
  54     assert(page.injectJs(tmpfile), "Unable to inject JS.");
  55     fs.remove(tmpfile);
  56
  57     var start = new Date().getTime();
  58     var rep_times = page.evaluate(function() {
  59       var rep_times = updatePlot();
  60       return rep_times;
  61     });
  62     var end = new Date().getTime();
  63     var elapsed = (end - start) / 1000;
  64     done_callback(rep_times);
  65   });
  66 };
  67
  68
  69 var points, series, repetitions;
  70 if (4 != system.args.length) {
  71   console.warn('Usage: phantomjs phantom-driver.js (points) (series) (repititions)');
  72   phantom.exit();
  73 }
  74
  75 points = parseInt(system.args[1]);
  76 series = parseInt(system.args[2]);
  77 repetitions = parseInt(system.args[3]);
  78 assert(points != null, "Couldn't parse " + system.args[1]);
  79 assert(series != null, "Couldn't parse " + system.args[2]);
  80 assert(repetitions != null, "Couldn't parse " + system.args[3]);
  81
  82
  83 RunBenchmark(points, series, repetitions, function(rep_times) {
  84   var mean = 0.0, std = 0.0;
  85   rep_times.forEach(function(x) { mean += x; } );
  86   mean /= rep_times.length;
  87   rep_times.forEach(function(x) { std += Math.pow(x - mean, 2); });
  88   std = Math.sqrt(std / (rep_times.length - 1));
  89
  90   console.log(points + '/' + series + '/' + repetitions + ': ' +
  91       mean.toFixed(1) + '+/-' + std.toFixed(1) + ' ms (' +
  92       rep_times.join(', ') + ')');
  93   phantom.exit();
  94 });