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@angular/benchpress

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Benchpress - a framework for e2e performance tests

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/** * @license * Copyright Google LLC 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 */ var PerflogMetric_1; import { __decorate, __metadata, __param } from "tslib"; import { Inject, Injectable, InjectionToken } from '@angular/core'; import { Options } from '../common_options'; import { Metric } from '../metric'; import { WebDriverExtension } from '../web_driver_extension'; /** * A metric that reads out the performance log */ let PerflogMetric = PerflogMetric_1 = class PerflogMetric extends Metric { /** * @param driverExtension * @param setTimeout * @param microMetrics Name and description of metrics provided via console.time / console.timeEnd * @param ignoreNavigation If true, don't measure from navigationStart events. These events are * usually triggered by a page load, but can also be triggered when adding iframes to the DOM. **/ constructor(_driverExtension, _setTimeout, _microMetrics, _forceGc, _captureFrames, _receivedData, _requestCount, _ignoreNavigation) { super(); this._driverExtension = _driverExtension; this._setTimeout = _setTimeout; this._microMetrics = _microMetrics; this._forceGc = _forceGc; this._captureFrames = _captureFrames; this._receivedData = _receivedData; this._requestCount = _requestCount; this._ignoreNavigation = _ignoreNavigation; this._remainingEvents = []; this._measureCount = 0; this._perfLogFeatures = _driverExtension.perfLogFeatures(); if (!this._perfLogFeatures.userTiming) { // User timing is needed for navigationStart. this._receivedData = false; this._requestCount = false; } } describe() { const res = { 'scriptTime': 'script execution time in ms, including gc and render', 'pureScriptTime': 'script execution time in ms, without gc nor render' }; if (this._perfLogFeatures.render) { res['renderTime'] = 'render time in ms'; } if (this._perfLogFeatures.gc) { res['gcTime'] = 'gc time in ms'; res['gcAmount'] = 'gc amount in kbytes'; res['majorGcTime'] = 'time of major gcs in ms'; if (this._forceGc) { res['forcedGcTime'] = 'forced gc time in ms'; res['forcedGcAmount'] = 'forced gc amount in kbytes'; } } if (this._receivedData) { res['receivedData'] = 'encoded bytes received since navigationStart'; } if (this._requestCount) { res['requestCount'] = 'count of requests sent since navigationStart'; } if (this._captureFrames) { if (!this._perfLogFeatures.frameCapture) { const warningMsg = 'WARNING: Metric requested, but not supported by driver'; // using dot syntax for metric name to keep them grouped together in console reporter res['frameTime.mean'] = warningMsg; res['frameTime.worst'] = warningMsg; res['frameTime.best'] = warningMsg; res['frameTime.smooth'] = warningMsg; } else { res['frameTime.mean'] = 'mean frame time in ms (target: 16.6ms for 60fps)'; res['frameTime.worst'] = 'worst frame time in ms'; res['frameTime.best'] = 'best frame time in ms'; res['frameTime.smooth'] = 'percentage of frames that hit 60fps'; } } for (const name in this._microMetrics) { res[name] = this._microMetrics[name]; } return res; } beginMeasure() { let resultPromise = Promise.resolve(null); if (this._forceGc) { resultPromise = resultPromise.then((_) => this._driverExtension.gc()); } return resultPromise.then((_) => this._beginMeasure()); } endMeasure(restart) { if (this._forceGc) { return this._endPlainMeasureAndMeasureForceGc(restart); } else { return this._endMeasure(restart); } } /** @internal */ _endPlainMeasureAndMeasureForceGc(restartMeasure) { return this._endMeasure(true).then((measureValues) => { // disable frame capture for measurements during forced gc const originalFrameCaptureValue = this._captureFrames; this._captureFrames = false; return this._driverExtension.gc() .then((_) => this._endMeasure(restartMeasure)) .then((forceGcMeasureValues) => { this._captureFrames = originalFrameCaptureValue; measureValues['forcedGcTime'] = forceGcMeasureValues['gcTime']; measureValues['forcedGcAmount'] = forceGcMeasureValues['gcAmount']; return measureValues; }); }); } _beginMeasure() { return this._driverExtension.timeBegin(this._markName(this._measureCount++)); } _endMeasure(restart) { const markName = this._markName(this._measureCount - 1); const nextMarkName = restart ? this._markName(this._measureCount++) : null; return this._driverExtension.timeEnd(markName, nextMarkName) .then((_) => this._readUntilEndMark(markName)); } _readUntilEndMark(markName, loopCount = 0, startEvent = null) { if (loopCount > _MAX_RETRY_COUNT) { throw new Error(`Tried too often to get the ending mark: ${loopCount}`); } return this._driverExtension.readPerfLog().then((events) => { this._addEvents(events); const result = this._aggregateEvents(this._remainingEvents, markName); if (result) { this._remainingEvents = events; return result; } let resolve; const promise = new Promise(res => { resolve = res; }); this._setTimeout(() => resolve(this._readUntilEndMark(markName, loopCount + 1)), 100); return promise; }); } _addEvents(events) { let needSort = false; events.forEach(event => { if (event['ph'] === 'X') { needSort = true; const startEvent = {}; const endEvent = {}; for (const prop in event) { startEvent[prop] = event[prop]; endEvent[prop] = event[prop]; } startEvent['ph'] = 'B'; endEvent['ph'] = 'E'; endEvent['ts'] = startEvent['ts'] + startEvent['dur']; this._remainingEvents.push(startEvent); this._remainingEvents.push(endEvent); } else { this._remainingEvents.push(event); } }); if (needSort) { // Need to sort because of the ph==='X' events this._remainingEvents.sort((a, b) => { const diff = a['ts'] - b['ts']; return diff > 0 ? 1 : diff < 0 ? -1 : 0; }); } } _aggregateEvents(events, markName) { const result = { 'scriptTime': 0, 'pureScriptTime': 0 }; if (this._perfLogFeatures.gc) { result['gcTime'] = 0; result['majorGcTime'] = 0; result['gcAmount'] = 0; } if (this._perfLogFeatures.render) { result['renderTime'] = 0; } if (this._captureFrames) { result['frameTime.mean'] = 0; result['frameTime.best'] = 0; result['frameTime.worst'] = 0; result['frameTime.smooth'] = 0; } for (const name in this._microMetrics) { result[name] = 0; } if (this._receivedData) { result['receivedData'] = 0; } if (this._requestCount) { result['requestCount'] = 0; } let markStartEvent = null; let markEndEvent = null; events.forEach((event) => { const ph = event['ph']; const name = event['name']; // Here we are determining if this is the event signaling the start or end of our performance // testing (this is triggered by us calling #timeBegin and #timeEnd). // // Previously, this was done by checking that the event name matched our mark name and that // the phase was either "B" or "E" ("begin" or "end"). However, since Chrome v90 this is // showing up as "-bpstart" and "-bpend" ("benchpress start/end"), which is what one would // actually expect since that is the mark name used in ChromeDriverExtension - see the // #timeBegin and #timeEnd implementations in chrome_driver_extension.ts. For // backwards-compatibility with Chrome v89 (and older), we do both checks: the phase-based // one ("B" or "E") and event name-based (the "-bp(start/end)" suffix). const isStartEvent = (ph === 'B' && name === markName) || name === markName + '-bpstart'; const isEndEvent = (ph === 'E' && name === markName) || name === markName + '-bpend'; if (isStartEvent) { markStartEvent = event; } else if (ph === 'I' && name === 'navigationStart' && !this._ignoreNavigation) { // if a benchmark measures reload of a page, use the last // navigationStart as begin event markStartEvent = event; } else if (isEndEvent) { markEndEvent = event; } }); if (!markStartEvent || !markEndEvent) { // not all events have been received, no further processing for now return null; } if (markStartEvent.pid !== markEndEvent.pid) { result['invalid'] = 1; } let gcTimeInScript = 0; let renderTimeInScript = 0; const frameTimestamps = []; const frameTimes = []; let frameCaptureStartEvent = null; let frameCaptureEndEvent = null; const intervalStarts = {}; const intervalStartCount = {}; let inMeasureRange = false; events.forEach((event) => { const ph = event['ph']; let name = event['name']; let microIterations = 1; const microIterationsMatch = name.match(_MICRO_ITERATIONS_REGEX); if (microIterationsMatch) { name = microIterationsMatch[1]; microIterations = parseInt(microIterationsMatch[2], 10); } if (event === markStartEvent) { inMeasureRange = true; } else if (event === markEndEvent) { inMeasureRange = false; } if (!inMeasureRange || event['pid'] !== markStartEvent['pid']) { return; } if (this._requestCount && name === 'sendRequest') { result['requestCount'] += 1; } else if (this._receivedData && name === 'receivedData' && ph === 'I') { result['receivedData'] += event['args']['encodedDataLength']; } if (ph === 'B' && name === _MARK_NAME_FRAME_CAPTURE) { if (frameCaptureStartEvent) { throw new Error('can capture frames only once per benchmark run'); } if (!this._captureFrames) { throw new Error('found start event for frame capture, but frame capture was not requested in benchpress'); } frameCaptureStartEvent = event; } else if (ph === 'E' && name === _MARK_NAME_FRAME_CAPTURE) { if (!frameCaptureStartEvent) { throw new Error('missing start event for frame capture'); } frameCaptureEndEvent = event; } if (ph === 'I' && frameCaptureStartEvent && !frameCaptureEndEvent && name === 'frame') { frameTimestamps.push(event['ts']); if (frameTimestamps.length >= 2) { frameTimes.push(frameTimestamps[frameTimestamps.length - 1] - frameTimestamps[frameTimestamps.length - 2]); } } if (ph === 'B') { if (!intervalStarts[name]) { intervalStartCount[name] = 1; intervalStarts[name] = event; } else { intervalStartCount[name]++; } } else if ((ph === 'E') && intervalStarts[name]) { intervalStartCount[name]--; if (intervalStartCount[name] === 0) { const startEvent = intervalStarts[name]; const duration = (event['ts'] - startEvent['ts']); intervalStarts[name] = null; if (name === 'gc') { result['gcTime'] += duration; const amount = (startEvent['args']['usedHeapSize'] - event['args']['usedHeapSize']) / 1000; result['gcAmount'] += amount; const majorGc = event['args']['majorGc']; if (majorGc && majorGc) { result['majorGcTime'] += duration; } if (intervalStarts['script']) { gcTimeInScript += duration; } } else if (name === 'render') { result['renderTime'] += duration; if (intervalStarts['script']) { renderTimeInScript += duration; } } else if (name === 'script') { result['scriptTime'] += duration; } else if (this._microMetrics[name]) { result[name] += duration / microIterations; } } } }); if (frameCaptureStartEvent && !frameCaptureEndEvent) { throw new Error('missing end event for frame capture'); } if (this._captureFrames && !frameCaptureStartEvent) { throw new Error('frame capture requested in benchpress, but no start event was found'); } if (frameTimes.length > 0) { this._addFrameMetrics(result, frameTimes); } result['pureScriptTime'] = result['scriptTime'] - gcTimeInScript - renderTimeInScript; return result; } _addFrameMetrics(result, frameTimes) { result['frameTime.mean'] = frameTimes.reduce((a, b) => a + b, 0) / frameTimes.length; const firstFrame = frameTimes[0]; result['frameTime.worst'] = frameTimes.reduce((a, b) => a > b ? a : b, firstFrame); result['frameTime.best'] = frameTimes.reduce((a, b) => a < b ? a : b, firstFrame); result['frameTime.smooth'] = frameTimes.filter(t => t < _FRAME_TIME_SMOOTH_THRESHOLD).length / frameTimes.length; } _markName(index) { return `${_MARK_NAME_PREFIX}${index}`; } }; PerflogMetric.SET_TIMEOUT = new InjectionToken('PerflogMetric.setTimeout'); PerflogMetric.IGNORE_NAVIGATION = new InjectionToken('PerflogMetric.ignoreNavigation'); PerflogMetric.PROVIDERS = [ { provide: PerflogMetric_1, deps: [ WebDriverExtension, PerflogMetric_1.SET_TIMEOUT, Options.MICRO_METRICS, Options.FORCE_GC, Options.CAPTURE_FRAMES, Options.RECEIVED_DATA, Options.REQUEST_COUNT, PerflogMetric_1.IGNORE_NAVIGATION ] }, { provide: PerflogMetric_1.SET_TIMEOUT, useValue: (fn, millis) => setTimeout(fn, millis) }, { provide: PerflogMetric_1.IGNORE_NAVIGATION, useValue: false } ]; PerflogMetric = PerflogMetric_1 = __decorate([ Injectable(), __param(1, Inject(PerflogMetric_1.SET_TIMEOUT)), __param(2, Inject(Options.MICRO_METRICS)), __param(3, Inject(Options.FORCE_GC)), __param(4, Inject(Options.CAPTURE_FRAMES)), __param(5, Inject(Options.RECEIVED_DATA)), __param(6, Inject(Options.REQUEST_COUNT)), __param(7, Inject(PerflogMetric_1.IGNORE_NAVIGATION)), __metadata("design:paramtypes", [WebDriverExtension, Function, Object, Boolean, Boolean, Boolean, Boolean, Boolean]) ], PerflogMetric); export { PerflogMetric }; const _MICRO_ITERATIONS_REGEX = /(.+)\*(\d+)$/; const _MAX_RETRY_COUNT = 20; const _MARK_NAME_PREFIX = 'benchpress'; const _MARK_NAME_FRAME_CAPTURE = 'frameCapture'; // using 17ms as a somewhat looser threshold, instead of 16.6666ms const _FRAME_TIME_SMOOTH_THRESHOLD = 17; //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Inject, Injectable, InjectionToken} from '@angular/core';\n\nimport {Options} from '../common_options';\nimport {Metric} from '../metric';\nimport {PerfLogEvent, PerfLogFeatures, WebDriverExtension} from '../web_driver_extension';\n\n\n/**\n * A metric that reads out the performance log\n */\n@Injectable()\nexport class PerflogMetric extends Metric {\n  static SET_TIMEOUT = new InjectionToken('PerflogMetric.setTimeout');\n  static IGNORE_NAVIGATION = new InjectionToken('PerflogMetric.ignoreNavigation');\n  static PROVIDERS = [\n    {\n      provide: PerflogMetric,\n      deps:\n          [\n            WebDriverExtension, PerflogMetric.SET_TIMEOUT, Options.MICRO_METRICS, Options.FORCE_GC,\n            Options.CAPTURE_FRAMES, Options.RECEIVED_DATA, Options.REQUEST_COUNT,\n            PerflogMetric.IGNORE_NAVIGATION\n          ]\n    },\n    {\n      provide: PerflogMetric.SET_TIMEOUT,\n      useValue: (fn: Function, millis: number) => <any>setTimeout(fn, millis)\n    },\n    {provide: PerflogMetric.IGNORE_NAVIGATION, useValue: false}\n  ];\n\n  private _remainingEvents: PerfLogEvent[];\n  private _measureCount: number;\n  private _perfLogFeatures: PerfLogFeatures;\n\n  /**\n   * @param driverExtension\n   * @param setTimeout\n   * @param microMetrics Name and description of metrics provided via console.time / console.timeEnd\n   * @param ignoreNavigation If true, don't measure from navigationStart events. These events are\n   *   usually triggered by a page load, but can also be triggered when adding iframes to the DOM.\n   **/\n  constructor(\n      private _driverExtension: WebDriverExtension,\n      @Inject(PerflogMetric.SET_TIMEOUT) private _setTimeout: Function,\n      @Inject(Options.MICRO_METRICS) private _microMetrics: {[key: string]: string},\n      @Inject(Options.FORCE_GC) private _forceGc: boolean,\n      @Inject(Options.CAPTURE_FRAMES) private _captureFrames: boolean,\n      @Inject(Options.RECEIVED_DATA) private _receivedData: boolean,\n      @Inject(Options.REQUEST_COUNT) private _requestCount: boolean,\n      @Inject(PerflogMetric.IGNORE_NAVIGATION) private _ignoreNavigation: boolean) {\n    super();\n\n    this._remainingEvents = [];\n    this._measureCount = 0;\n    this._perfLogFeatures = _driverExtension.perfLogFeatures();\n    if (!this._perfLogFeatures.userTiming) {\n      // User timing is needed for navigationStart.\n      this._receivedData = false;\n      this._requestCount = false;\n    }\n  }\n\n  override describe(): {[key: string]: string} {\n    const res: {[key: string]: any} = {\n      'scriptTime': 'script execution time in ms, including gc and render',\n      'pureScriptTime': 'script execution time in ms, without gc nor render'\n    };\n    if (this._perfLogFeatures.render) {\n      res['renderTime'] = 'render time in ms';\n    }\n    if (this._perfLogFeatures.gc) {\n      res['gcTime'] = 'gc time in ms';\n      res['gcAmount'] = 'gc amount in kbytes';\n      res['majorGcTime'] = 'time of major gcs in ms';\n      if (this._forceGc) {\n        res['forcedGcTime'] = 'forced gc time in ms';\n        res['forcedGcAmount'] = 'forced gc amount in kbytes';\n      }\n    }\n    if (this._receivedData) {\n      res['receivedData'] = 'encoded bytes received since navigationStart';\n    }\n    if (this._requestCount) {\n      res['requestCount'] = 'count of requests sent since navigationStart';\n    }\n    if (this._captureFrames) {\n      if (!this._perfLogFeatures.frameCapture) {\n        const warningMsg = 'WARNING: Metric requested, but not supported by driver';\n        // using dot syntax for metric name to keep them grouped together in console reporter\n        res['frameTime.mean'] = warningMsg;\n        res['frameTime.worst'] = warningMsg;\n        res['frameTime.best'] = warningMsg;\n        res['frameTime.smooth'] = warningMsg;\n      } else {\n        res['frameTime.mean'] = 'mean frame time in ms (target: 16.6ms for 60fps)';\n        res['frameTime.worst'] = 'worst frame time in ms';\n        res['frameTime.best'] = 'best frame time in ms';\n        res['frameTime.smooth'] = 'percentage of frames that hit 60fps';\n      }\n    }\n    for (const name in this._microMetrics) {\n      res[name] = this._microMetrics[name];\n    }\n    return res;\n  }\n\n  override beginMeasure(): Promise<any> {\n    let resultPromise = Promise.resolve(null);\n    if (this._forceGc) {\n      resultPromise = resultPromise.then((_) => this._driverExtension.gc());\n    }\n    return resultPromise.then((_) => this._beginMeasure());\n  }\n\n  override endMeasure(restart: boolean): Promise<{[key: string]: number}> {\n    if (this._forceGc) {\n      return this._endPlainMeasureAndMeasureForceGc(restart);\n    } else {\n      return this._endMeasure(restart);\n    }\n  }\n\n  /** @internal */\n  private _endPlainMeasureAndMeasureForceGc(restartMeasure: boolean) {\n    return this._endMeasure(true).then((measureValues) => {\n      // disable frame capture for measurements during forced gc\n      const originalFrameCaptureValue = this._captureFrames;\n      this._captureFrames = false;\n      return this._driverExtension.gc()\n          .then((_) => this._endMeasure(restartMeasure))\n          .then((forceGcMeasureValues) => {\n            this._captureFrames = originalFrameCaptureValue;\n            measureValues['forcedGcTime'] = forceGcMeasureValues['gcTime'];\n            measureValues['forcedGcAmount'] = forceGcMeasureValues['gcAmount'];\n            return measureValues;\n          });\n    });\n  }\n\n  private _beginMeasure(): Promise<any> {\n    return this._driverExtension.timeBegin(this._markName(this._measureCount++));\n  }\n\n  private _endMeasure(restart: boolean): Promise<{[key: string]: number}> {\n    const markName = this._markName(this._measureCount - 1);\n    const nextMarkName = restart ? this._markName(this._measureCount++) : null;\n    return this._driverExtension.timeEnd(markName, nextMarkName)\n        .then((_: any) => this._readUntilEndMark(markName));\n  }\n\n  private _readUntilEndMark(\n      markName: string, loopCount: number = 0, startEvent: PerfLogEvent|null = null) {\n    if (loopCount > _MAX_RETRY_COUNT) {\n      throw new Error(`Tried too often to get the ending mark: ${loopCount}`);\n    }\n    return this._driverExtension.readPerfLog().then((events) => {\n      this._addEvents(events);\n      const result = this._aggregateEvents(this._remainingEvents, markName);\n      if (result) {\n        this._remainingEvents = events;\n        return result;\n      }\n      let resolve: (result: any) => void;\n      const promise = new Promise<{[key: string]: number}>(res => {\n        resolve = res;\n      });\n      this._setTimeout(() => resolve(this._readUntilEndMark(markName, loopCount + 1)), 100);\n      return promise;\n    });\n  }\n\n  private _addEvents(events: PerfLogEvent[]) {\n    let needSort = false;\n    events.forEach(event => {\n      if (event['ph'] === 'X') {\n        needSort = true;\n        const startEvent: PerfLogEvent = {};\n        const endEvent: PerfLogEvent = {};\n        for (const prop in event) {\n          startEvent[prop] = event[prop];\n          endEvent[prop] = event[prop];\n        }\n        startEvent['ph'] = 'B';\n        endEvent['ph'] = 'E';\n        endEvent['ts'] = startEvent['ts']! + startEvent['dur']!;\n        this._remainingEvents.push(startEvent);\n        this._remainingEvents.push(endEvent);\n      } else {\n        this._remainingEvents.push(event);\n      }\n    });\n    if (needSort) {\n      // Need to sort because of the ph==='X' events\n      this._remainingEvents.sort((a, b) => {\n        const diff = a['ts']! - b['ts']!;\n        return diff > 0 ? 1 : diff < 0 ? -1 : 0;\n      });\n    }\n  }\n\n  private _aggregateEvents(events: PerfLogEvent[], markName: string): {[key: string]: number}|null {\n    const result: {[key: string]: number} = {'scriptTime': 0, 'pureScriptTime': 0};\n    if (this._perfLogFeatures.gc) {\n      result['gcTime'] = 0;\n      result['majorGcTime'] = 0;\n      result['gcAmount'] = 0;\n    }\n    if (this._perfLogFeatures.render) {\n      result['renderTime'] = 0;\n    }\n    if (this._captureFrames) {\n      result['frameTime.mean'] = 0;\n      result['frameTime.best'] = 0;\n      result['frameTime.worst'] = 0;\n      result['frameTime.smooth'] = 0;\n    }\n    for (const name in this._microMetrics) {\n      result[name] = 0;\n    }\n    if (this._receivedData) {\n      result['receivedData'] = 0;\n    }\n    if (this._requestCount) {\n      result['requestCount'] = 0;\n    }\n\n    let markStartEvent: PerfLogEvent = null!;\n    let markEndEvent: PerfLogEvent = null!;\n    events.forEach((event) => {\n      const ph = event['ph'];\n      const name = event['name'];\n\n      // Here we are determining if this is the event signaling the start or end of our performance\n      // testing (this is triggered by us calling #timeBegin and #timeEnd).\n      //\n      // Previously, this was done by checking that the event name matched our mark name and that\n      // the phase was either \"B\" or \"E\" (\"begin\" or \"end\"). However, since Chrome v90 this is\n      // showing up as \"-bpstart\" and \"-bpend\" (\"benchpress start/end\"), which is what one would\n      // actually expect since that is the mark name used in ChromeDriverExtension - see the\n      // #timeBegin and #timeEnd implementations in chrome_driver_extension.ts. For\n      // backwards-compatibility with Chrome v89 (and older), we do both checks: the phase-based\n      // one (\"B\" or \"E\") and event name-based (the \"-bp(start/end)\" suffix).\n      const isStartEvent = (ph === 'B' && name === markName) || name === markName + '-bpstart';\n      const isEndEvent = (ph === 'E' && name === markName) || name === markName + '-bpend';\n      if (isStartEvent) {\n        markStartEvent = event;\n      } else if (ph === 'I' && name === 'navigationStart' && !this._ignoreNavigation) {\n        // if a benchmark measures reload of a page, use the last\n        // navigationStart as begin event\n        markStartEvent = event;\n      } else if (isEndEvent) {\n        markEndEvent = event;\n      }\n    });\n    if (!markStartEvent || !markEndEvent) {\n      // not all events have been received, no further processing for now\n      return null;\n    }\n    if (markStartEvent.pid !== markEndEvent.pid) {\n      result['invalid'] = 1;\n    }\n\n    let gcTimeInScript = 0;\n    let renderTimeInScript = 0;\n\n    const frameTimestamps: number[] = [];\n    const frameTimes: number[] = [];\n    let frameCaptureStartEvent: PerfLogEvent|null = null;\n    let frameCaptureEndEvent: PerfLogEvent|null = null;\n\n    const intervalStarts: {[key: string]: PerfLogEvent} = {};\n    const intervalStartCount: {[key: string]: number} = {};\n\n    let inMeasureRange = false;\n    events.forEach((event) => {\n      const ph = event['ph'];\n      let name = event['name']!;\n      let microIterations = 1;\n      const microIterationsMatch = name.match(_MICRO_ITERATIONS_REGEX);\n      if (microIterationsMatch) {\n        name = microIterationsMatch[1];\n        microIterations = parseInt(microIterationsMatch[2], 10);\n      }\n      if (event === markStartEvent) {\n        inMeasureRange = true;\n      } else if (event === markEndEvent) {\n        inMeasureRange = false;\n      }\n      if (!inMeasureRange ||