simple perf testing harness with JSON parsing tests

- all tests should be under perf/
- all payloads should be under perf/data
- run tests with ./server.sh + ./test-perf.sh

We still lack a way to compare results against a baseline, but
this is better than nothing.

jsTestDriver-perf.conf

@@ -0,0 +1,13 @@
+server: http://localhost:9876
+
+load:
+  - lib/jasmine-1.0.1/jasmine.js
+  - lib/jasmine-jstd-adapter/JasmineAdapter.js
+  - lib/jquery/jquery-1.4.2.js
+  - test/jquery_remove.js
+  - build/angular.min.js
+  - perf/data/*.js
+  - perf/testUtils.js
+  - perf/*.js
+
+exclude:

perf/data/jsonParserPayload.rb

@@ -0,0 +1,49 @@
+def generate_object(f, objName, iterations)
+  f.write("var #{objName}='[");
+ 
+  iterations.times do |i| 
+    f.write('{')
+
+    f.write('"simpleStringProperty":')     #23
+    f.write('"some string value ' + ('%07d' % i) + '"')  #27
+    f.write(',')
+    
+    f.write('"stringWithQuotes":')         #19
+    f.write('"some string with \\\\"quotes\\\\" ' + ('%07d' % i) + '"')  #36
+    f.write(',')
+ 
+    f.write('"stringWithUnicode":')
+    f.write('"short string with \\u1234 unicode \\u2345 chars ' +  ('%07d' % i) + '"')
+    f.write(',')
+
+    f.write('"aNumber":')  #10
+    f.write(i)  #?
+    f.write(',')
+   
+    f.write('"smallArray":')
+    f.write('["a",23,"b",42,' + i.to_s + ']')
+    f.write(',')
+
+    f.write('"smallObj":')
+    f.write('{"foo":"bar","baz":543,"num":' + i.to_s + ',"fuz":"fuz buz huz duz ' + i.to_s + '"}')
+    f.write(',')
+
+    f.write('"timeStamp":')
+    f.write('"2010-12-22T04:58:01.' + ("%03d" % (i%1000)) + '"')
+
+    f.write('},')
+  end
+
+  f.write('"just a padding string"]\';' + "\n\n");
+end
+
+file_path = File.join(File.dirname(__FILE__), 'jsonParserPayload.js')
+
+File.open(file_path, 'w') do |f|
+  generate_object(f, 'superTinyJsonString', 1)  #~300b
+  generate_object(f, 'tinyJsonString', 3)       #~1kb
+  generate_object(f, 'smallJsonString', 30)     #~10kb
+  generate_object(f, 'mediumJsonString', 600)   #~200kb
+  generate_object(f, 'largeJsonString', 2000)   #~650kb
+end
+

perf/jsonPerfSpec.js

@@ -0,0 +1,55 @@
+describe('json', function() {
+  xit('should parse json in a reasonable time', function() {
+    var totalSubstr = 0,
+        totalGetMatch = 0,
+        totalConsume = 0,
+        totalTime = 0,
+        runTimes = [];
+    
+    for (var i=0; i<10; i++) {
+      window.substrTime = 0;
+      window.getMatchTime = 0;
+      window.consumeTime = 0;
+      var start = Date.now();
+      expect(angular.fromJson(largeJsonString)).toBeTruthy();
+      var time = Date.now() - start;
+//      dump('parse time', time, 'consume', window.consumeTime,
+//                               'substr', window.substrTime,
+//                               'getMatch', window.getMatchTime);
+      totalTime += time;
+      totalSubstr += window.substrTime;
+      totalGetMatch += window.getMatchTime;
+      totalConsume += window.consumeTime;
+      runTimes.push(time);
+    }
+
+    totalGetMatch = totalGetMatch - totalSubstr;
+
+    dump("totals", totalTime,
+          "| consume", totalConsume, '' + Math.round(totalConsume/(totalTime/100)) + '%',
+          "| substr", totalSubstr, '' + Math.round(totalSubstr/(totalTime/100)) + '%',
+          "| getMatch", totalGetMatch, '' + Math.round(totalGetMatch/(totalTime/100)) + '%');
+    dump("run times", runTimes);
+    delete window.consumeTime;
+    delete window.substrTime;
+    delete window.getMatchTime;
+  });
+
+
+  it('angular parser', function() {
+    var duration = time(function() {
+      expect(angular.fromJson(largeJsonString)).toBeTruthy();
+    }, 1);
+
+    expect(duration).toBeLessThan(4000);
+  });
+
+
+  it('native json', function() {
+    var duration = time(function() {
+      expect(JSON.parse(largeJsonString)).toBeTruthy();
+    }, 1);
+
+    expect(duration).toBeLessThan(200);
+  });
+});

perf/testUtils.js

@@ -0,0 +1,20 @@
+if (window.jstestdriver) {
+  jstd = jstestdriver;
+  dump = angular.bind(jstd.console, jstd.console.log);
+}
+
+function time(fn, times) {
+  times = times || 1;
+
+  var i,
+      start,
+      duration = 0;
+
+  for (i=0; i<times; i++) {
+    start = Date.now();
+    fn();
+    duration += Date.now() - start;
+  }
+
+  return duration;
+}

server.sh

@@ -1,3 +1,3 @@
 #!/bin/bash
 
-java -jar lib/jstestdriver/JsTestDriver.jar --port 9876 --browserTimeout 20000
+java -jar lib/jstestdriver/JsTestDriver.jar --port 9876 --browserTimeout 90000

test-perf.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+tests=$1
+norecompile=$2
+
+if [[ $tests = "" ]]; then
+  tests="all"
+fi
+
+if [[ $norecompile = "" ]]; then
+  rake compile
+fi
+
+java -jar lib/jstestdriver/JsTestDriver.jar --tests "$tests" --config jsTestDriver-perf.conf