feat(benchpress): also report the statistics in the generated file

modules/@angular/benchpress/src/reporter/console_reporter.ts

@@ -14,7 +14,8 @@ import {Math} from '../facade/math';
 import {MeasureValues} from '../measure_values';
 import {Reporter} from '../reporter';
 import {SampleDescription} from '../sample_description';
-import {Statistic} from '../statistic';
+
+import {formatNum, formatStats, sortedProps} from './util';
 
 
 /**
@@ -37,15 +38,6 @@ export class ConsoleReporter extends Reporter {
     return result + value;
   }
 
-  private static _formatNum(n: number) { return NumberWrapper.toFixed(n, 2); }
-
-  private static _sortedProps(obj: {[key: string]: any}) {
-    var props: string[] = [];
-    StringMapWrapper.forEach(obj, (value, prop) => props.push(prop));
-    props.sort();
-    return props;
-  }
-
   private _metricNames: string[];
 
   constructor(
@@ -53,14 +45,14 @@ export class ConsoleReporter extends Reporter {
       sampleDescription: SampleDescription,
       @Inject(ConsoleReporter.PRINT) private _print: Function) {
     super();
-    this._metricNames = ConsoleReporter._sortedProps(sampleDescription.metrics);
+    this._metricNames = sortedProps(sampleDescription.metrics);
     this._printDescription(sampleDescription);
   }
 
   private _printDescription(sampleDescription: SampleDescription) {
     this._print(`BENCHMARK ${sampleDescription.id}`);
     this._print('Description:');
-    var props = ConsoleReporter._sortedProps(sampleDescription.description);
+    var props = sortedProps(sampleDescription.description);
     props.forEach((prop) => { this._print(`- ${prop}: ${sampleDescription.description[prop]}`); });
     this._print('Metrics:');
     this._metricNames.forEach((metricName) => {
@@ -74,7 +66,7 @@ export class ConsoleReporter extends Reporter {
   reportMeasureValues(measureValues: MeasureValues): Promise<any> {
     var formattedValues = this._metricNames.map(metricName => {
       var value = measureValues.values[metricName];
-      return ConsoleReporter._formatNum(value);
+      return formatNum(value);
     });
     this._printStringRow(formattedValues);
     return Promise.resolve(null);
@@ -82,15 +74,8 @@ export class ConsoleReporter extends Reporter {
 
   reportSample(completeSample: MeasureValues[], validSamples: MeasureValues[]): Promise<any> {
     this._printStringRow(this._metricNames.map((_) => ''), '=');
-    this._printStringRow(this._metricNames.map(metricName => {
-      var samples = validSamples.map(measureValues => measureValues.values[metricName]);
-      var mean = Statistic.calculateMean(samples);
-      var cv = Statistic.calculateCoefficientOfVariation(samples, mean);
-      var formattedMean = ConsoleReporter._formatNum(mean);
-      // Note: Don't use the unicode character for +- as it might cause
-      // hickups for consoles...
-      return NumberWrapper.isNaN(cv) ? formattedMean : `${formattedMean}+-${Math.floor(cv)}%`;
-    }));
+    this._printStringRow(
+        this._metricNames.map(metricName => formatStats(validSamples, metricName)));
     return Promise.resolve(null);
   }
 

modules/@angular/benchpress/src/reporter/json_file_reporter.ts

@@ -14,6 +14,7 @@ import {MeasureValues} from '../measure_values';
 import {Reporter} from '../reporter';
 import {SampleDescription} from '../sample_description';
 
+import {formatStats, sortedProps} from './util';
 
 
 /**
@@ -34,10 +35,15 @@ export class JsonFileReporter extends Reporter {
   reportMeasureValues(measureValues: MeasureValues): Promise<any> { return Promise.resolve(null); }
 
   reportSample(completeSample: MeasureValues[], validSample: MeasureValues[]): Promise<any> {
+    const stats: {[key: string]: string} = {};
+    sortedProps(this._description.metrics).forEach((metricName) => {
+      stats[metricName] = formatStats(validSample, metricName);
+    });
     var content = Json.stringify({
       'description': this._description,
+      'stats': stats,
       'completeSample': completeSample,
-      'validSample': validSample
+      'validSample': validSample,
     });
     var filePath =
         `${this._path}/${this._description.id}_${DateWrapper.toMillis(this._now())}.json`;

modules/@angular/benchpress/src/reporter/util.ts

@@ -0,0 +1,33 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {StringMapWrapper} from '../facade/collection';
+import {NumberWrapper} from '../facade/lang';
+import {MeasureValues} from '../measure_values';
+import {Statistic} from '../statistic';
+
+export function formatNum(n: number) {
+  return NumberWrapper.toFixed(n, 2);
+}
+
+export function sortedProps(obj: {[key: string]: any}) {
+  var props: string[] = [];
+  StringMapWrapper.forEach(obj, (value, prop) => props.push(prop));
+  props.sort();
+  return props;
+}
+
+export function formatStats(validSamples: MeasureValues[], metricName: string): string {
+  var samples = validSamples.map(measureValues => measureValues.values[metricName]);
+  var mean = Statistic.calculateMean(samples);
+  var cv = Statistic.calculateCoefficientOfVariation(samples, mean);
+  var formattedMean = formatNum(mean);
+  // Note: Don't use the unicode character for +- as it might cause
+  // hickups for consoles...
+  return NumberWrapper.isNaN(cv) ? formattedMean : `${formattedMean}+-${Math.floor(cv)}%`;
+}

modules/@angular/benchpress/test/reporter/json_file_reporter_spec.ts

@@ -44,7 +44,7 @@ export function main() {
            sampleId: 'someId',
            descriptions: [{'a': 2}],
            path: 'somePath',
-           metrics: {'script': 'script time'}
+           metrics: {'a': 'script time', 'b': 'render time'}
          })
              .reportSample(
                  [mv(0, 0, {'a': 3, 'b': 6})],
@@ -53,8 +53,12 @@ export function main() {
          expect(isPresent(loggedFile['filename'].match(regExp))).toBe(true);
          var parsedContent = Json.parse(loggedFile['content']);
          expect(parsedContent).toEqual({
-           'description':
-               {'id': 'someId', 'description': {'a': 2}, 'metrics': {'script': 'script time'}},
+           'description': {
+             'id': 'someId',
+             'description': {'a': 2},
+             'metrics': {'a': 'script time', 'b': 'render time'}
+           },
+           'stats': {'a': '4.00+-25%', 'b': '7.50+-20%'},
            'completeSample': [
              {'timeStamp': '1970-01-01T00:00:00.000Z', 'runIndex': 0, 'values': {'a': 3, 'b': 6}}
            ],