Add manyProperties benchmark, illustrates expense of iterating throug…

…h many properties

benchmark/manyProperties.js

@@ -0,0 +1,65 @@
+var State = require('../ampersand-state');
+
+// State slows down massively with many properties.
+// We benchmark this here.
+function createModel() {
+  var aModel = State.extend({
+    derived: {
+      foo: {
+        deps: ['a', 'b'],
+        fn: function derived () {
+          return this.a + this.b;
+        }
+      }
+    }
+  });
+  return aModel;
+}
+
+// Go through most of the normal ascii range.
+// Adjust I and J for larger objects.
+var properties = {};
+for (var i = 0; i < 1; i++) {
+  for (var j = 0; j < 83; j++) {
+    properties[String.fromCharCode(j + 33) + i] = j;
+  }
+}
+
+//Function that contains the pattern to be inspected
+var aModel = createModel();
+function benchFn() {
+  return new aModel(properties).foo;
+}
+
+function printStatus(fn) {
+    switch(%GetOptimizationStatus(fn)) {
+        case 1: console.log("Function is optimized"); break;
+        case 2: console.log("Function is not optimized"); break;
+        case 3: console.log("Function is always optimized"); break;
+        case 4: console.log("Function is never optimized"); break;
+        case 6: console.log("Function is maybe deoptimized"); break;
+    }
+}
+
+//Fill type-info
+benchFn();
+// 2 calls are needed to go from uninitialized -> pre-monomorphic -> monomorphic
+benchFn();
+benchFn();
+benchFn();
+benchFn();
+benchFn();
+
+%OptimizeFunctionOnNextCall(benchFn);
+//The next call
+benchFn();
+
+//Check
+printStatus(benchFn);
+
+
+console.time('manyProperties');
+for (var i = 0; i < 10000;i++) {
+  benchFn();
+}
+console.timeEnd('manyProperties');

package.json

@@ -66,7 +66,7 @@
     "coverage": "rm -rf coverage && istanbul cover -- tape test/index.js --verbose",
     "validate": "npm ls",
     "lint": "jshint ampersand-state.js ./test/*",
-    "benchmark": "node --allow-natives-syntax benchmark/massCreate.js",
+    "benchmark": "for f in benchmark/*.js; do node --allow-natives-syntax --trace-deopt $f; done",
     "preversion": "git checkout master && git pull && npm ls",
     "publish-patch": "npm run preversion && npm version patch && git push origin master --tags && npm publish",
     "publish-minor": "npm run preversion && npm version minor && git push origin master --tags && npm publish",