Feature: Add metrics output from puppeteer.

packages/flamegrill/src/__tests__/flamegrill.test.ts

@@ -1,17 +1,34 @@
 import fs from 'fs';
 import path from 'path';
 import * as tmp from 'tmp';
-import puppeteer, { Browser, Page } from 'puppeteer';
+import puppeteer, { Browser, Metrics, Page } from 'puppeteer';
 
-import { cook, CookResult, Scenarios, ScenarioConfig } from '../flamegrill';
+import { cook, Scenarios, ScenarioConfig } from '../flamegrill';
+import { ScenarioProfile } from '../profile';
 import { __unitTestHooks } from '../process/process';
-import { findRegressions } from '../analyze/regression';
+import { analyzeFunctions } from '../analyze/functional';
 
 // TODO: these are black box tests for now but should be refactored to be unit tests
 // TODO: modules that output files should be modified not to and wrapped by a centralized file output helper
 // TODO: consider also making file output / github / CI integration another package within this repo
 
 describe('flamegrill', () => {
+  const testMetrics: Metrics = {
+    Timestamp: 0,
+    Documents: 1,
+    Frames: 2,
+    JSEventListeners: 3,
+    Nodes: 4,
+    LayoutCount: 5,
+    RecalcStyleCount: 6,
+    LayoutDuration: 7,
+    RecalcStyleDuration: 8,
+    ScriptDuration: 9,
+    TaskDuration: 10,
+    JSHeapUsedSize: 11,
+    JSHeapTotalSize: 12
+  }
+
   describe('cook', () => {
     const profiles = require('../fixtures/profiles.json');
     const util = require('../util');
@@ -28,7 +45,7 @@ describe('flamegrill', () => {
       goto: jest.fn(() => {
         return Promise.resolve(null);
       }),
-      metrics: jest.fn(() => Promise.resolve({})),
+      metrics: jest.fn(() => Promise.resolve(testMetrics)),
       setDefaultTimeout: jest.fn(() => {})
     } as unknown as Page;
 
@@ -73,7 +90,7 @@ describe('flamegrill', () => {
 
     it('generates expected output', async () => {
       const snapshotsDir = path.join(__dirname, '../fixtures/snapshots');
-      const expectedResults = require('../fixtures/results.json');
+      const expectedResults = require(path.join(snapshotsDir, 'results.json'));
 
       // Set up arr_diff to feed in predefined profiler log fixtures.
       jest.spyOn(util, 'arr_diff').mockImplementation(() => {
@@ -94,10 +111,11 @@ describe('flamegrill', () => {
       const testResults = await cook(scenarios, scenarioConfig);
 
       // The path will differ for every test run, so remove it before comparing results.
+      removePaths(expectedResults);
       removePaths(testResults);
 
       // Convenience line left commented out for updating expected output.
-      // fs.writeFileSync(path.join(outdir.name, "results.json"), JSON.stringify(testResults));
+      fs.writeFileSync(path.join(outdir.name, "results.json"), JSON.stringify(testResults));
 
       expect(testResults).toEqual(expectedResults);
 
@@ -107,19 +125,32 @@ describe('flamegrill', () => {
       expect(testFiles).toEqual(snapshotFiles);
 
       testFiles.forEach(file => {
-        // Some generated output creates files with \r\n. Some environments spit out \n.
-        // Ignore line break types when comparing results.
-        const analysis = fs.readFileSync(path.join(snapshotsDir, file), 'utf8').split(/\r?\n/g);
-        const output = fs.readFileSync(path.join(outdir.name, file), 'utf8').split(/\r?\n/g);
+        let expectedFileContents;
+        let testFileContents;
 
-        expect(output).toEqual(analysis);
+        if(file.includes('.json')) {
+          expectedFileContents = require(path.join(snapshotsDir, file));
+          testFileContents = require(path.join(outdir.name, file));
+
+          // The path will differ for every test run, so remove it before comparing results.
+          removePaths(expectedFileContents);
+          removePaths(testFileContents);
+        } else {
+          // Some generated output creates files with \r\n. Some environments spit out \n.
+          // Ignore line break types when comparing results.
+          expectedFileContents = fs.readFileSync(path.join(snapshotsDir, file), 'utf8').split(/\r?\n/g);
+          testFileContents = fs.readFileSync(path.join(outdir.name, file), 'utf8').split(/\r?\n/g);
+        }
+
+        expect(testFileContents).toEqual(expectedFileContents);
       });
 
       expect((testBrowser.close as jest.Mock).mock.calls.length).toEqual(1);
     });
 
     it('errors on invalid profile logs', async () => {
-      const expectedResults = require('../fixtures/errors/errors.json');
+      const snapshotsDir = path.join(__dirname, '../fixtures/errors/snapshots');
+      const expectedResults = require(path.join(snapshotsDir, 'results.json'));
 
       // Set up arr_diff to feed in predefined profiler log fixtures.
       jest.spyOn(util, 'arr_diff').mockImplementation(() => {
@@ -130,6 +161,7 @@ describe('flamegrill', () => {
       const testResults = await cook({ 'test': { scenario: 'testUrl' } }, scenarioConfig);
 
       // The path will differ for every test run, so remove it before comparing results.
+      removePaths(expectedResults);
       removePaths(testResults);
 
       // Convenience line left commented out for updating expected output.
@@ -137,19 +169,40 @@ describe('flamegrill', () => {
 
       expect(testResults).toEqual(expectedResults);
 
+      const snapshotFiles = fs.readdirSync(snapshotsDir);
       const testFiles = fs.readdirSync(outdir.name);
-      expect(testFiles).toEqual(['test.err.txt']);
-      
-      const errorFile = fs.readFileSync(path.join(outdir.name, 'test.err.txt'));
-      expect(errorFile.includes('Error: dispatchLogRow_: Can\'t parse tick,0xfffffffdeb11c0e4,55914,0,0x0,6, integer too large.')).toBeTruthy();
+
+      expect(testFiles).toEqual(snapshotFiles);
       
+      testFiles.forEach(file => {
+        let expectedFileContent;
+        let testFileContent;
+
+        if(file.includes('.json')) {
+          expectedFileContent = require(path.join(snapshotsDir, file));
+          testFileContent = require(path.join(outdir.name, file));
+
+          // The path will differ for every test run, so remove it before comparing results.
+          removePaths(expectedFileContent);
+          removePaths(testFileContent);
+
+          expect(testFileContent).toEqual(expectedFileContent);
+        } else if (file === 'test.err.txt') {
+          const errorFile = fs.readFileSync(path.join(outdir.name, 'test.err.txt'));
+          expect(errorFile.includes('Error: dispatchLogRow_: Can\'t parse tick,0xfffffffdeb11c0e4,55914,0,0x0,6, integer too large.')).toBeTruthy();
+        } else {
+          // Unknown file, test should be updated to check results.
+          expect(file).toEqual('');
+        }
+      });
+
       expect((testBrowser.close as jest.Mock).mock.calls.length).toEqual(1);
     });
   });
   
   // These tests are technically redundant with cook tests but are left for now as they may be useful 
   // as unit tests are added.
-  describe('generateFlamegraph, findRegressions', () => {
+  describe('generateFlamegraph, analyzeFunctions', () => {
     const { processProfile } = __unitTestHooks;
     const profiles = require('../fixtures/profiles.json');
     const snapshotsDir = path.join(__dirname, '../fixtures/snapshots');
@@ -164,31 +217,37 @@ describe('flamegrill', () => {
 
       // TODO: replace with processProfiles?
       await Promise.all(Object.keys(profiles).map(key => {
-        let logfile = require.resolve(path.join('../fixtures', profiles[key].logFile));
-        let outfile = path.join(outdir.name, key);
-        return processProfile(logfile, outfile)
+        const profile: ScenarioProfile = {
+          logFile: require.resolve(path.join('../fixtures', profiles[key].logFile)),
+          metrics: testMetrics
+        };
+        const outfile = path.join(outdir.name, key);
+        return processProfile(profile, outfile)
       }));
 
       await Promise.all(Object.keys(profiles).map(key => {
-        let logfile = require.resolve(path.join('../fixtures', profiles[key].baseline.logFile));
-        let outfile = path.join(outdir.name, key + '_base');
-        return processProfile(logfile, outfile)
+        const profile: ScenarioProfile = {
+          logFile: require.resolve(path.join('../fixtures', profiles[key].baseline.logFile)),
+          metrics: testMetrics
+        };
+        const outfile = path.join(outdir.name, key + '_base');
+        return processProfile(profile, outfile)
       }));
 
       Object.keys(profiles).forEach(key => {
         // TODO: this code block is duplicating code in flamegrill.ts and should be removed as code is refactored.
-        let datafileBefore = path.join(outdir.name, key + '_base.data.js');
-        let datafileAfter = path.join(outdir.name, key + '.data.js');
+        let datafileBasline = path.join(outdir.name, key + '_base.data.js');
+        let datafile = path.join(outdir.name, key + '.data.js');
         let regressionfile = path.join(outdir.name, key + '.regression.txt');
 
-        const analysis = findRegressions(datafileBefore, datafileAfter);
+        const analysis = analyzeFunctions(datafileBasline, datafile);
 
         if(analysis.isRegression) {
           fs.writeFileSync(regressionfile, analysis.summary);
         }
       });
 
-      const snapshotFiles = fs.readdirSync(snapshotsDir);
+      const snapshotFiles = fs.readdirSync(snapshotsDir).filter(file => file !== 'results.json');
       const testFiles = fs.readdirSync(outdir.name);
 
       expect(testFiles).toEqual(snapshotFiles);
@@ -213,7 +272,6 @@ describe('flamegrill', () => {
 function removePaths<T>(obj: T) {
   Object.keys(obj).forEach(key => {
     if (key.includes('File')) {
-      console.log(`key = ${key}`);
       obj[key as keyof T] = path.basename(obj[key as keyof T] as any) as any;
     } else if (obj[key as keyof T] instanceof Object) {
       removePaths(obj[key as keyof T]);

packages/flamegrill/src/analyze/__tests__/functional.test.ts

@@ -1,4 +1,4 @@
-import { FunctionData, __unitTestHooks } from '../regression';
+import { FunctionData, __unitTestHooks } from '../functional';
 
 const { filterMinifiedNames, filterSystemNames } = __unitTestHooks;
 

packages/flamegrill/src/analyze/analyze.ts

@@ -2,15 +2,16 @@ import fs from 'fs';
 import path from 'path';
 
 import { ScenarioConfig } from '../flamegrill';
+import { ScenarioProfiles } from '../profile';
 import { ProcessedScenario, ProcessedScenarios } from '../process';
 
-import { findRegressions, RegressionOutput } from './regression';
+import { analyzeFunctions, FunctionalAnalysis } from './functional';
 
 export interface Analysis {
   numTicks: number;
 }
 
-export interface RegressionAnalysis extends RegressionOutput {
+export interface RegressionAnalysis extends FunctionalAnalysis {
   regressionFile?: string;
 };
 
@@ -46,7 +47,7 @@ function analyzeScenario(scenario: ProcessedScenario, scenarioName: string, conf
 
     if (scenario.baseline && scenario.baseline.output) {
       let numTicksBaseline = getTicks(scenario.baseline.output.dataFile);
-      let analysis: RegressionAnalysis = findRegressions(scenario.baseline.output.dataFile, scenario.output.dataFile);
+      let analysis: RegressionAnalysis = analyzeFunctions(scenario.baseline.output.dataFile, scenario.output.dataFile);
       if (analysis.isRegression) {
         analysis.regressionFile = `${scenarioName}.regression.txt`;
         fs.writeFileSync(path.join(config.outDir, analysis.regressionFile), analysis.summary);

packages/flamegrill/src/analyze/functional.ts

@@ -47,7 +47,7 @@ export interface ProcessedData {
   numTicks: number;
 }
 
-export interface RegressionOutput {
+export interface FunctionalAnalysis {
   summary: string;
   isRegression: boolean;
 }
@@ -58,11 +58,11 @@ export interface RegressionOutput {
  * @param {string} datafileBaseline Baseline data.
  * @param {string} datafile Scenario data.
  */
-export function findRegressions(datafileBaseline: string, datafile: string): RegressionOutput {
+export function analyzeFunctions(datafileBaseline: string, datafile: string): FunctionalAnalysis {
   let summary = '';
   let isRegression = false;
-  const dataBefore = readFlamegraphData(datafileBaseline);
-  const dataAfter = readFlamegraphData(datafile);
+  const dataBaseline = readFlamegraphData(datafileBaseline);
+  const data = readFlamegraphData(datafile);
 
   // TODO: UNIT TESTS FOR EVERYONE!
   // * function removed making other functions seem to be regressions when overall perf improves
@@ -95,12 +95,12 @@ export function findRegressions(datafileBaseline: string, datafile: string): Reg
   const regressions: FunctionRegression[] = [];
 
   // Analyze data to find new functions and regressions.
-  Object.keys(dataAfter.functionsMap).forEach(name => {
+  Object.keys(data.functionsMap).forEach(name => {
     // In some scenarios (such as native button), a tick can represent more time than our base thresholds. 
     // In these cases, elevate the base threshold to the tick base * 2.
     // For example, if base threshold reports new functions at 2% time consumed, but 1 tick is 4% time, 
     // then new functions will only be reported when > 8%.
-    const minTicks = Math.min(dataBefore.numTicks, dataAfter.numTicks);
+    const minTicks = Math.min(dataBaseline.numTicks, data.numTicks);
     const regressionNew = Math.max(1 / minTicks * 2, regressionNewBase);
     const regressionDiff = Math.max(1 / minTicks * 2, regressionDiffBase);
 
@@ -109,31 +109,31 @@ export function findRegressions(datafileBaseline: string, datafile: string): Reg
     //   console.log(`Modified base thresholds: regressionNew = ${regressionNew}, regressionDiff = ${regressionDiff}`);
     // }
 
-    const after = dataAfter.functionsMap[name];
-    const before = dataBefore.functionsMap[name];
+    const functions = data.functionsMap[name];
+    const functionsBaseline = dataBaseline.functionsMap[name];
 
     // TODO: This analysis should really account for the entire call hierarchy when comparing rather than just averaging.
     // For now just ignore spurious 1 tick instances by using the same number of instances for both.
-    const instances = before ? Math.min(before.instances.length, after.instances.length) : after.instances.length;
-    const afterTicksNormalized = calcTotalTicksNormalized(after.instances) / instances;
+    const instances = functionsBaseline ? Math.min(functionsBaseline.instances.length, functions.instances.length) : functions.instances.length;
+    const ticksNormalized = calcTotalTicksNormalized(functions.instances) / instances;
 
-    if (!before) {
-      if(afterTicksNormalized > regressionNew) {
-        newFunctions.push({ name, displayName: after.displayName });
+    if (!functionsBaseline) {
+      if(ticksNormalized > regressionNew) {
+        newFunctions.push({ name, displayName: functions.displayName });
       }
     } else {
-      const beforeTicksNormalized = calcTotalTicksNormalized(before.instances) / instances;
-      const percDiff = afterTicksNormalized - beforeTicksNormalized;
+      const ticksNormalizedBaseline = calcTotalTicksNormalized(functionsBaseline.instances) / instances;
+      const percDiff = ticksNormalized - ticksNormalizedBaseline;
 
       if (percDiff > regressionDiff) {
-        regressions.push({ name, displayName: after.displayName });
+        regressions.push({ name, displayName: functions.displayName });
       }
     }
 
   });
 
   summary += `Results for ${path.basename(datafileBaseline)} => ${path.basename(datafile)}\n\n`;
-  summary += `numTicks: ${dataBefore.numTicks} => ${dataAfter.numTicks}\n\n`;
+  summary += `numTicks: ${dataBaseline.numTicks} => ${data.numTicks}\n\n`;
 
   if (regressions.length === 0 && newFunctions.length === 0) {
     summary += 'OK!';
@@ -143,23 +143,23 @@ export function findRegressions(datafileBaseline: string, datafile: string): Reg
     isRegression = true;
     summary += 'Potential Regressions: \n';
     regressions.forEach(regression => {
-      const after = dataAfter.functionsMap[regression.displayName];
-      const before = dataBefore.functionsMap[regression.displayName];
+      const functions = data.functionsMap[regression.displayName];
+      const functionsBaseline = dataBaseline.functionsMap[regression.displayName];
   
       // Averaging prevents overexaggeration of recurisve functions, but can also underexaggerate their impact.
       // Averaging can also cause spurious (1 tick samples of obj.computed, what causes these?) of functions to underexaggerate impact.
       // TODO: Remove averaging when analysis takes into account call hierarchy.
       // For now just ignore spurious 1 tick instances by using the same number of instances for both.
-      const instances = before ? Math.min(before.instances.length, after.instances.length) : after.instances.length;
-      const afterTicksNormalized = calcTotalTicksNormalized(after.instances) / instances;
-      const beforeTicksNormalized = before && calcTotalTicksNormalized(before.instances) / instances;
+      const instances = functionsBaseline ? Math.min(functionsBaseline.instances.length, functions.instances.length) : functions.instances.length;
+      const ticksNormalized = calcTotalTicksNormalized(functions.instances) / instances;
+      const ticksNormalizedBaseline = functionsBaseline && calcTotalTicksNormalized(functionsBaseline.instances) / instances;
   
-      const beforeTicksDisplay = beforeTicksNormalized ? (beforeTicksNormalized * 100).toFixed(0) : 'not present';
-      const afterTicksDisplay = afterTicksNormalized && (afterTicksNormalized * 100).toFixed(0);
+      const ticksDisplayBaseline = ticksNormalizedBaseline ? (ticksNormalizedBaseline * 100).toFixed(0) : 'not present';
+      const ticksDisplay = ticksNormalized && (ticksNormalized * 100).toFixed(0);
 
       summary += ` ${regression.displayName}` +
-        `, time consumed: ${beforeTicksDisplay}% => ` +
-        `${afterTicksDisplay}% \n`;
+        `, time consumed: ${ticksDisplayBaseline}% => ` +
+        `${ticksDisplay}% \n`;
     });
   }
 
@@ -167,7 +167,7 @@ export function findRegressions(datafileBaseline: string, datafile: string): Reg
     isRegression = true;
     summary += '\nNew Functions: \n';
     newFunctions.forEach(newFunction => {
-      const ticksNormalized = calcTotalTicksNormalized(dataAfter.functionsMap[newFunction.displayName].instances);
+      const ticksNormalized = calcTotalTicksNormalized(data.functionsMap[newFunction.displayName].instances);
       summary += ` ${newFunction.displayName}, time consumed = ${(ticksNormalized * 100).toFixed(0)}%\n`;
     });
   }
@@ -327,7 +327,7 @@ if (require.main === module) {
   });
 
   scenarios.forEach(scenario => {
-    const analysis = findRegressions(path.join(process.cwd(), `${scenario}_base.data.js`), path.join(process.cwd(), `${scenario}.data.js`));
+    const analysis = analyzeFunctions(path.join(process.cwd(), `${scenario}_base.data.js`), path.join(process.cwd(), `${scenario}.data.js`));
     console.log(JSON.stringify(analysis));
     // processPerfData(path.join(process.cwd(), `${scenario}_base.js`), path.join(process.cwd(), `${scenario}.js`));
   });

packages/flamegrill/src/fixtures/errors/errors.json

@@ -1,13 +0,0 @@
-{
-  "test": {
-    "profile": {
-      "logFile": "error.prof",
-      "metrics": {}
-    },
-    "processed": {
-      "error": {
-        "errorFile": "test.err.txt"
-      }
-    }
-  }
-}

packages/flamegrill/src/fixtures/errors/snapshots/results.json

@@ -0,0 +1,27 @@
+{
+  "test": {
+    "profile": {
+      "logFile": "C:\\Users\\Jason\\src\\flamegrill\\packages\\flamegrill\\src\\fixtures\\errors\\error.prof",
+      "metrics": {
+        "Timestamp": 0,
+        "Documents": 1,
+        "Frames": 2,
+        "JSEventListeners": 3,
+        "Nodes": 4,
+        "LayoutCount": 5,
+        "RecalcStyleCount": 6,
+        "LayoutDuration": 7,
+        "RecalcStyleDuration": 8,
+        "ScriptDuration": 9,
+        "TaskDuration": 10,
+        "JSHeapUsedSize": 11,
+        "JSHeapTotalSize": 12
+      }
+    },
+    "processed": {
+      "error": {
+        "errorFile": "C:\\Users\\Jason\\AppData\\Local\\Temp\\tmp-31156P9K1pPOdnx3z\\test.err.txt"
+      }
+    }
+  }
+}

packages/flamegrill/src/fixtures/errors/snapshots/test.err.txt

@@ -0,0 +1,15 @@
+C:\Users\Jason\src\flamegrill\packages\flamegrill\lib\tickprocessor.js:880
+      throw e;
+      ^
+
+Error: dispatchLogRow_: Can't parse tick,0xfffffffdeb11c0e4,55914,0,0x0,6, integer too large.
+    at TickProcessor.LogReader.dispatchLogRow_ (C:\Users\Jason\src\flamegrill\packages\flamegrill\lib\tickprocessor.js:835:19)
+    at TickProcessor.LogReader.processLogLine_ (C:\Users\Jason\src\flamegrill\packages\flamegrill\lib\tickprocessor.js:876:12)
+    at TickProcessor.LogReader.processLogLine (C:\Users\Jason\src\flamegrill\packages\flamegrill\lib\tickprocessor.js:736:10)
+    at TickProcessor.processLogFile (C:\Users\Jason\src\flamegrill\packages\flamegrill\lib\tickprocessor.js:2793:10)
+    at Object.<anonymous> (C:\Users\Jason\src\flamegrill\packages\flamegrill\lib\tickprocessor.js:3565:15)
+    at Module._compile (internal/modules/cjs/loader.js:778:30)
+    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
+    at Module.load (internal/modules/cjs/loader.js:653:32)
+    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
+    at Function.Module._load (internal/modules/cjs/loader.js:585:3)

packages/flamegrill/src/fixtures/results.json

@@ -1,678 +0,0 @@
-{
-  "BaseButton": {
-    "profile": {
-      "logFile": "isolate-000001C8E897A980-9332-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000002716F92D960-27048-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "BaseButton.data.js",
-        "flamegraphFile": "BaseButton.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "BaseButton_base.data.js",
-          "flamegraphFile": "BaseButton_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 327,
-      "baseline": {
-        "numTicks": 345
-      },
-      "regression": {
-        "summary": "Results for BaseButton_base.data.js => BaseButton.data.js\n\nnumTicks: 345 => 327\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "BaseButtonNew": {
-    "profile": {
-      "logFile": "isolate-00000150C15DDCB0-8200-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001C7CB0729F0-15316-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "BaseButtonNew.data.js",
-        "flamegraphFile": "BaseButtonNew.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "BaseButtonNew_base.data.js",
-          "flamegraphFile": "BaseButtonNew_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 421,
-      "baseline": {
-        "numTicks": 426
-      },
-      "regression": {
-        "summary": "Results for BaseButtonNew_base.data.js => BaseButtonNew.data.js\n\nnumTicks: 426 => 421\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "button": {
-    "profile": {
-      "logFile": "isolate-000001FA30C2C060-15348-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-00000218B8DE6280-33408-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "button.data.js",
-        "flamegraphFile": "button.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "button_base.data.js",
-          "flamegraphFile": "button_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 26,
-      "baseline": {
-        "numTicks": 28
-      },
-      "regression": {
-        "summary": "Results for button_base.data.js => button.data.js\n\nnumTicks: 28 => 26\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "DefaultButton": {
-    "profile": {
-      "logFile": "isolate-0000026F3D5C86F0-32220-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001A279165800-31988-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "DefaultButton.data.js",
-        "flamegraphFile": "DefaultButton.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "DefaultButton_base.data.js",
-          "flamegraphFile": "DefaultButton_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 455,
-      "baseline": {
-        "numTicks": 528
-      },
-      "regression": {
-        "summary": "Results for DefaultButton_base.data.js => DefaultButton.data.js\n\nnumTicks: 528 => 455\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "DefaultButtonNew": {
-    "profile": {
-      "logFile": "isolate-000001976475B760-12772-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001AFA4995FB0-8920-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "DefaultButtonNew.data.js",
-        "flamegraphFile": "DefaultButtonNew.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "DefaultButtonNew_base.data.js",
-          "flamegraphFile": "DefaultButtonNew_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 882,
-      "baseline": {
-        "numTicks": 923
-      },
-      "regression": {
-        "summary": "Results for DefaultButtonNew_base.data.js => DefaultButtonNew.data.js\n\nnumTicks: 923 => 882\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "DetailsRow": {
-    "profile": {
-      "logFile": "isolate-000001C75B30DD10-19448-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-0000016A4F24EAD0-27036-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "DetailsRow.data.js",
-        "flamegraphFile": "DetailsRow.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "DetailsRow_base.data.js",
-          "flamegraphFile": "DetailsRow_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 2750,
-      "baseline": {
-        "numTicks": 1471
-      },
-      "regression": {
-        "summary": "Results for DetailsRow_base.data.js => DetailsRow.data.js\n\nnumTicks: 1471 => 2750\n\nPotential Regressions: \n ~DetailsRowBase.render, time consumed: 7% => 30% \n ~getClassNames, time consumed: 1% => 15% \n ~mergeStyleSets, time consumed: 0% => 37% \n ~styleToRegistration, time consumed: 0% => 27% \n",
-        "isRegression": true,
-        "regressionFile": "DetailsRow.regression.txt"
-      }
-    }
-  },
-  "DetailsRowFast": {
-    "profile": {
-      "logFile": "isolate-000001AB3AA2DE10-28068-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-0000025EBEA9C020-13384-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "DetailsRowFast.data.js",
-        "flamegraphFile": "DetailsRowFast.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "DetailsRowFast_base.data.js",
-          "flamegraphFile": "DetailsRowFast_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 2695,
-      "baseline": {
-        "numTicks": 1409
-      },
-      "regression": {
-        "summary": "Results for DetailsRowFast_base.data.js => DetailsRowFast.data.js\n\nnumTicks: 1409 => 2695\n\nPotential Regressions: \n ~DetailsRowBase.render, time consumed: 6% => 27% \n ~extractRules, time consumed: 0% => 20% \n ~getClassNames, time consumed: 1% => 14% \n ~mergeStyleSets, time consumed: 0% => 36% \n ~styleToRegistration, time consumed: 0% => 27% \n",
-        "isRegression": true,
-        "regressionFile": "DetailsRowFast.regression.txt"
-      }
-    }
-  },
-  "DetailsRowNoStyles": {
-    "profile": {
-      "logFile": "isolate-000001D1BFE31800-24432-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001CEF69AFE10-4612-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "DetailsRowNoStyles.data.js",
-        "flamegraphFile": "DetailsRowNoStyles.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "DetailsRowNoStyles_base.data.js",
-          "flamegraphFile": "DetailsRowNoStyles_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 1948,
-      "baseline": {
-        "numTicks": 1466
-      },
-      "regression": {
-        "summary": "Results for DetailsRowNoStyles_base.data.js => DetailsRowNoStyles.data.js\n\nnumTicks: 1466 => 1948\n\nPotential Regressions: \n ~CheckBase, time consumed: 1% => 15% \n ~DetailsRowCheckBase, time consumed: 3% => 14% \n\nNew Functions: \n ~mergeStyleSets, time consumed = 23%\n ~styleToRegistration, time consumed = 17%\n",
-        "isRegression": true,
-        "regressionFile": "DetailsRowNoStyles.regression.txt"
-      }
-    }
-  },
-  "DocumentCardTitle": {
-    "profile": {
-      "logFile": "isolate-000001658015DEE0-9140-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000002A0A0FDD770-30228-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "DocumentCardTitle.data.js",
-        "flamegraphFile": "DocumentCardTitle.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "DocumentCardTitle_base.data.js",
-          "flamegraphFile": "DocumentCardTitle_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 16012,
-      "baseline": {
-        "numTicks": 15919
-      },
-      "regression": {
-        "summary": "Results for DocumentCardTitle_base.data.js => DocumentCardTitle.data.js\n\nnumTicks: 15919 => 16012\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "MenuButton": {
-    "profile": {
-      "logFile": "isolate-0000023E414D6CE0-28460-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000002744B17D570-32064-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "MenuButton.data.js",
-        "flamegraphFile": "MenuButton.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "MenuButton_base.data.js",
-          "flamegraphFile": "MenuButton_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 647,
-      "baseline": {
-        "numTicks": 590
-      },
-      "regression": {
-        "summary": "Results for MenuButton_base.data.js => MenuButton.data.js\n\nnumTicks: 590 => 647\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "MenuButtonNew": {
-    "profile": {
-      "logFile": "isolate-0000021FD7B39BB0-28188-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-0000028C417C8AC0-24936-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "MenuButtonNew.data.js",
-        "flamegraphFile": "MenuButtonNew.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "MenuButtonNew_base.data.js",
-          "flamegraphFile": "MenuButtonNew_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 1548,
-      "baseline": {
-        "numTicks": 1581
-      },
-      "regression": {
-        "summary": "Results for MenuButtonNew_base.data.js => MenuButtonNew.data.js\n\nnumTicks: 1581 => 1548\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "PrimaryButton": {
-    "profile": {
-      "logFile": "isolate-00000224DD39CC70-27088-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-00000289B99F90F0-33752-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "PrimaryButton.data.js",
-        "flamegraphFile": "PrimaryButton.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "PrimaryButton_base.data.js",
-          "flamegraphFile": "PrimaryButton_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 488,
-      "baseline": {
-        "numTicks": 496
-      },
-      "regression": {
-        "summary": "Results for PrimaryButton_base.data.js => PrimaryButton.data.js\n\nnumTicks: 496 => 488\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "PrimaryButtonNew": {
-    "profile": {
-      "logFile": "isolate-000001D40015E310-20784-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001C3BAC2EA80-32776-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "PrimaryButtonNew.data.js",
-        "flamegraphFile": "PrimaryButtonNew.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "PrimaryButtonNew_base.data.js",
-          "flamegraphFile": "PrimaryButtonNew_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 922,
-      "baseline": {
-        "numTicks": 1001
-      },
-      "regression": {
-        "summary": "Results for PrimaryButtonNew_base.data.js => PrimaryButtonNew.data.js\n\nnumTicks: 1001 => 922\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "SplitButton": {
-    "profile": {
-      "logFile": "isolate-000001D2DD15DB40-22696-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001292C499B50-24060-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "SplitButton.data.js",
-        "flamegraphFile": "SplitButton.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "SplitButton_base.data.js",
-          "flamegraphFile": "SplitButton_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 1293,
-      "baseline": {
-        "numTicks": 1355
-      },
-      "regression": {
-        "summary": "Results for SplitButton_base.data.js => SplitButton.data.js\n\nnumTicks: 1355 => 1293\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "SplitButtonNew": {
-    "profile": {
-      "logFile": "isolate-0000027E6DE24B80-31272-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000002EAD2E39E10-33780-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "SplitButtonNew.data.js",
-        "flamegraphFile": "SplitButtonNew.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "SplitButtonNew_base.data.js",
-          "flamegraphFile": "SplitButtonNew_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 3155,
-      "baseline": {
-        "numTicks": 3048
-      },
-      "regression": {
-        "summary": "Results for SplitButtonNew_base.data.js => SplitButtonNew.data.js\n\nnumTicks: 3048 => 3155\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "Stack": {
-    "profile": {
-      "logFile": "isolate-000002958EF69420-30340-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-00000199612E7F60-32084-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "Stack.data.js",
-        "flamegraphFile": "Stack.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "Stack_base.data.js",
-          "flamegraphFile": "Stack_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 263,
-      "baseline": {
-        "numTicks": 251
-      },
-      "regression": {
-        "summary": "Results for Stack_base.data.js => Stack.data.js\n\nnumTicks: 251 => 263\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "StackWithIntrinsicChildren": {
-    "profile": {
-      "logFile": "isolate-000002CB95DF62A0-29024-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001F8F52C6E60-30996-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "StackWithIntrinsicChildren.data.js",
-        "flamegraphFile": "StackWithIntrinsicChildren.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "StackWithIntrinsicChildren_base.data.js",
-          "flamegraphFile": "StackWithIntrinsicChildren_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 563,
-      "baseline": {
-        "numTicks": 596
-      },
-      "regression": {
-        "summary": "Results for StackWithIntrinsicChildren_base.data.js => StackWithIntrinsicChildren.data.js\n\nnumTicks: 596 => 563\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "StackWithTextChildren": {
-    "profile": {
-      "logFile": "isolate-000001E2F953C450-33588-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001AA84CA8D20-8016-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "StackWithTextChildren.data.js",
-        "flamegraphFile": "StackWithTextChildren.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "StackWithTextChildren_base.data.js",
-          "flamegraphFile": "StackWithTextChildren_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 1978,
-      "baseline": {
-        "numTicks": 1928
-      },
-      "regression": {
-        "summary": "Results for StackWithTextChildren_base.data.js => StackWithTextChildren.data.js\n\nnumTicks: 1928 => 1978\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "Text": {
-    "profile": {
-      "logFile": "isolate-00000257772F8820-33584-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000002236CE1DD30-25244-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "Text.data.js",
-        "flamegraphFile": "Text.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "Text_base.data.js",
-          "flamegraphFile": "Text_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 206,
-      "baseline": {
-        "numTicks": 168
-      },
-      "regression": {
-        "summary": "Results for Text_base.data.js => Text.data.js\n\nnumTicks: 168 => 206\n\nOK!",
-        "isRegression": false
-      }
-    }
-  },
-  "Toggle": {
-    "profile": {
-      "logFile": "isolate-00000248C0C3E090-14868-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-000001FCF48C0980-25140-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "Toggle.data.js",
-        "flamegraphFile": "Toggle.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "Toggle_base.data.js",
-          "flamegraphFile": "Toggle_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 882,
-      "baseline": {
-        "numTicks": 454
-      },
-      "regression": {
-        "summary": "Results for Toggle_base.data.js => Toggle.data.js\n\nnumTicks: 454 => 882\n\nPotential Regressions: \n ~ToggleBase.render, time consumed: 9% => 53% \n ~getClassNames, time consumed: 2% => 47% \n ~mergeStyleSets, time consumed: 0% => 39% \n ~obj.<computed>, time consumed: 10% => 53% \n ~styleToRegistration, time consumed: 0% => 29% \n\nNew Functions: \n ~Toggle_styles_getStyles, time consumed = 6%\n ~_resolve, time consumed = 7%\n ~_styles, time consumed = 7%\n ~extractRules, time consumed = 42%\n ~getKeyForRules, time consumed = 8%\n",
-        "isRegression": true,
-        "regressionFile": "Toggle.regression.txt"
-      }
-    }
-  },
-  "ToggleNew": {
-    "profile": {
-      "logFile": "isolate-000002231747AC50-11576-puppeteer.prof",
-      "metrics": {},
-      "baseline": {
-        "logFile": "isolate-0000014BEA16EDB0-28552-puppeteer.prof",
-        "metrics": {}
-      }
-    },
-    "processed": {
-      "output": {
-        "dataFile": "ToggleNew.data.js",
-        "flamegraphFile": "ToggleNew.html"
-      },
-      "baseline": {
-        "output": {
-          "dataFile": "ToggleNew_base.data.js",
-          "flamegraphFile": "ToggleNew_base.html"
-        }
-      }
-    },
-    "analysis": {
-      "numTicks": 1165,
-      "baseline": {
-        "numTicks": 1102
-      },
-      "regression": {
-        "summary": "Results for ToggleNew_base.data.js => ToggleNew.data.js\n\nnumTicks: 1102 => 1165\n\nOK!",
-        "isRegression": false
-      }
-    }
-  }
-}

packages/flamegrill/src/flamegrill.ts

@@ -71,6 +71,8 @@ export async function cook(scenarios: Scenarios, userConfig?: ScenarioConfig): P
     };
   });
 
+  fs.writeFileSync(path.join(config.outDir, 'results.json'), JSON.stringify(results));
+  
   console.log('results: ');
   console.dir(results, { depth: null });
 

packages/flamegrill/src/process/metrics.ts

@@ -0,0 +1,56 @@
+import { Metrics } from 'puppeteer';
+
+export function addMetrics(flamegraph: string, metrics: Metrics): string {
+  const metricsTableHeader = `
+    <details>
+      <summary>Metrics</summary>
+      <table>
+        <tr>
+          <th>
+            <a href="https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#pagemetrics">Metric</a>
+          </th>
+          <th>Value</th>
+        </tr>
+    `;
+  const metricsTableFooter = `
+      </table>
+    </details>  
+  `;
+  
+
+  const metricsTableContents = Object
+    .keys(metrics)
+    .map(key => {
+      return `
+          <tr>
+            <td>${key}</td>
+            <td>${getFormattedValue(metrics[key as keyof Metrics], key as keyof Metrics)}</td>
+          </tr>
+      `;
+    })
+    .join('');
+
+  const metricsTable = metricsTableHeader + metricsTableContents + metricsTableFooter;
+
+  // Use placeholder in string to add metrics.
+  flamegraph = flamegraph
+    .split('<!-- /* METRICS_PLACEHOLDER */ -->')
+    .join(metricsTable);
+
+  return flamegraph;
+};
+
+function getFormattedValue(value: number, key: keyof Metrics): string {
+  switch(key) {
+    case 'JSHeapUsedSize':
+    case 'JSHeapTotalSize':
+      return value.toLocaleString('en') + ' bytes';
+    case 'LayoutDuration':
+    case 'RecalcStyleDuration':
+    case 'ScriptDuration':
+    case 'TaskDuration':
+      return value.toLocaleString('en', { maximumSignificantDigits: 3 }) + ' s';
+    default:
+      return value.toString();
+  }
+}

packages/flamegrill/src/process/process.ts

@@ -2,10 +2,12 @@ import fs from 'fs';
 import path from 'path';
 import cp from 'child_process';
 import concat from 'concat-stream';
-import flamebearer from './flamebearer';
 
 import { ScenarioConfig } from '../flamegrill';
-import { ScenarioProfiles } from '../profile';
+import { ScenarioProfile, ScenarioProfiles } from '../profile';
+
+import flamebearer from './flamebearer';
+import { addMetrics } from './metrics';
 
 // TODO: is file output good enough here as an API? should this return programmatic results?
 export interface ProcessedOutput {
@@ -42,10 +44,10 @@ export async function processProfiles(profiles: ScenarioProfiles, config: Requir
     const outFileBaseline = path.join(config.outDir, `${scenarioName}_base`);
     const result = profiles[scenarioName];
 
-    const processedScenario: ProcessedScenario = await processProfile(result.logFile, outFile);
+    const processedScenario: ProcessedScenario = await processProfile(result, outFile);
 
     if(result.baseline) {
-      processedScenario.baseline = await processProfile(result.baseline.logFile, outFileBaseline);
+      processedScenario.baseline = await processProfile(result.baseline, outFileBaseline);
     }
 
     processedScenarios[scenarioName] = processedScenario;
@@ -54,8 +56,8 @@ export async function processProfiles(profiles: ScenarioProfiles, config: Requir
   return processedScenarios;
 }
 
-async function processProfile(logFile: string, outFile: string): Promise<Processed> {
-  return generateFlamegraph(logFile, outFile);
+async function processProfile(profile: ScenarioProfile, outFile: string): Promise<Processed> {
+  return generateFlamegraph(profile, outFile);
 }
 
 /**
@@ -66,10 +68,10 @@ async function processProfile(logFile: string, outFile: string): Promise<Process
  * @param {string} outFile File path and base name for file output. Extensions will be added for each type of file output.
  * @returns {Promise<OutputFiles>} Promise resolving to generated files.
  */
-async function generateFlamegraph(logFile: string, outFile: string): Promise<Processed> {
+async function generateFlamegraph(profile: ScenarioProfile, outFile: string): Promise<Processed> {
   // TODO: account for --windows, --unix and --mac arguments? what is the output difference with and without these args?
   // TODO: use cli
-  const preprocessProc = cp.spawn(process.execPath, [tickprocessor, '--preprocess', '-j', logFile]);
+  const preprocessProc = cp.spawn(process.execPath, [tickprocessor, '--preprocess', '-j', profile.logFile]);
   const flamegraphFile = outFile + '.html'
   const dataFile = outFile + '.data.js';
   const errorFile = outFile + '.err.txt';
@@ -86,7 +88,10 @@ async function generateFlamegraph(logFile: string, outFile: string): Promise<Pro
         // This line writes intermediate streaming output for troubleshooting:
         // fs.writeFileSync(flamegraphfile.split('.html').join('.preprocessed.log'), preprocessed);
 
-        const [flamegraph, data] = flamebearer(preprocessed);
+        let [flamegraph, data] = flamebearer(preprocessed);
+
+        flamegraph = addMetrics(flamegraph, profile.metrics);
+
         fs.writeFileSync(flamegraphFile, flamegraph);
         fs.writeFileSync(dataFile, data);
 

packages/flamegrill/src/profile/profile.ts

@@ -36,6 +36,7 @@ export async function profile(scenarios: Scenarios, config: Required<ScenarioCon
 
   const browser = await puppeteer.launch({
     headless: true,
+    // TODO: use --single-process arg?
     args: [
       '--flag-switches-begin',
       '--no-sandbox',