Add a command-line performance test

diff --git a/phantom-perf.js b/phantom-perf.js
new file mode 100644 (file)
index 0000000..b98c3f0
--- /dev/null
+++ b/phantom-perf.js
@@ -0,0 +1,94 @@
+// dygraphs command-line performance benchmark.
+//
+// Invoke as:
+//
+//   phantomjs phantom-perf.js 1000 100 5
+//
+// If the test succeeds, it will print out something like:
+//
+//   1000/100/5: 1309.4+/-43.4 ms (1284, 1245, 1336, 1346, 1336)
+//
+// This is mean +/- standard deviation, followed by a list of the individual
+// times for each repetition, in milliseconds.
+
+var system = require('system'),
+    fs = require('fs');
+
+var tmpfile = "tmp-dygraph-test-params.js";
+var url = 'tests/dygraph-many-points-benchmark.html';
+
+function fail(msg){
+  console.warn(msg);
+  phantom.exit(1);
+}
+
+function assert(condition, msg){
+  if (condition) return;
+  fail(msg);
+}
+
+var config_file_template =
+    "document.getElementById('points').value = (points);\n" +
+    "document.getElementById('series').value = (series);\n" +
+    "document.getElementById('repetitions').value = (repetitions);\n";
+
+var RunBenchmark = function(points, series, repetitions, done_callback) {
+  var page = require('webpage').create();
+
+  // page.evalute() is seriously locked down.
+  // This was the only way I could find to pass the parameters to the page.
+  fs.write(tmpfile,
+      config_file_template
+        .replace("(points)", points)
+        .replace("(series)", series)
+        .replace("(repetitions)", repetitions),
+      "w");
+
+  page.open(url, function(status) {
+    if (status !== 'success') {
+      console.warn('Page status: ' + status);
+      console.log(page);
+      phantom.exit();
+    }
+
+    assert(page.injectJs(tmpfile), "Unable to inject JS.");
+    fs.remove(tmpfile);
+
+    var start = new Date().getTime();
+    var rep_times = page.evaluate(function() {
+      var rep_times = updatePlot();
+      return rep_times;
+    });
+    var end = new Date().getTime();
+    var elapsed = (end - start) / 1000;
+    done_callback(rep_times);
+  });
+};
+
+
+var points, series, repetitions;
+if (4 != system.args.length) {
+  console.warn('Usage: phantomjs phantom-driver.js (points) (series) (repititions)');
+  phantom.exit();
+}
+
+points = parseInt(system.args[1]);
+series = parseInt(system.args[2]);
+repetitions = parseInt(system.args[3]);
+assert(points != null, "Couldn't parse " + system.args[1]);
+assert(series != null, "Couldn't parse " + system.args[2]);
+assert(repetitions != null, "Couldn't parse " + system.args[3]);
+
+
+RunBenchmark(points, series, repetitions, function(rep_times) {
+  var mean = 0.0, std = 0.0;
+  rep_times.forEach(function(x) { mean += x; } );
+  mean /= rep_times.length;
+  rep_times.forEach(function(x) { std += Math.pow(x - mean, 2); });
+  std = Math.sqrt(std / (rep_times.length - 1));
+
+  console.log(points + '/' + series + '/' + repetitions + ': ' +
+      mean.toFixed(1) + '+/-' + std.toFixed(1) + ' ms (' +
+      rep_times.join(', ') + ')');
+  phantom.exit();
+});

diff --git a/tests/dygraph-many-points-benchmark.html b/tests/dygraph-many-points-benchmark.html
index 7aadb19..79566de 100644 (file)
--- a/tests/dygraph-many-points-benchmark.html
+++ b/tests/dygraph-many-points-benchmark.html
@@ -124,6 +124,8 @@
           document.getElementById("metaperformance").innerHTML =
               "completed in " + (end2 - start2) + " milliseconds.";
         }
+
+        return millisecondss;
       };
       
       clickedRadioButton = function(radiobutton) {