diff --git a/test/apps/instrumentation-overhead/index.html b/test/apps/instrumentation-overhead/index.html new file mode 100644 index 0000000000..4c909f744f --- /dev/null +++ b/test/apps/instrumentation-overhead/index.html @@ -0,0 +1,13 @@ + + + + + + Instrumentation Overhead Benchmark + + +

Instrumentation Overhead Benchmark

+

This page is used for benchmarking debugger instrumentation overhead.

+ + + diff --git a/test/apps/instrumentation-overhead/package.json b/test/apps/instrumentation-overhead/package.json new file mode 100644 index 0000000000..3d5d8732e9 --- /dev/null +++ b/test/apps/instrumentation-overhead/package.json @@ -0,0 +1,28 @@ +{ + "name": "instrumentation-overhead-app", + "private": true, + "scripts": { + "build": "webpack --config ./webpack.config.js" + }, + "peerDependencies": { + "@datadog/browser-debugger": "*" + }, + "peerDependenciesMeta": { + "@datadog/browser-debugger": { + "optional": true + } + }, + "resolutions": { + "@datadog/browser-core": "file:../../../packages/core/package.tgz", + "@datadog/browser-debugger": "file:../../../packages/debugger/package.tgz" + }, + "devDependencies": { + "ts-loader": "9.5.1", + "typescript": "5.9.3", + "webpack": "5.105.2" + }, + "volta": { + "extends": "../../../package.json" + }, + "packageManager": "yarn@4.12.0" +} diff --git a/test/apps/instrumentation-overhead/src/app.ts b/test/apps/instrumentation-overhead/src/app.ts new file mode 100644 index 0000000000..a728229cfe --- /dev/null +++ b/test/apps/instrumentation-overhead/src/app.ts @@ -0,0 +1,23 @@ +/** + * Main entry point for instrumentation overhead benchmark + * Exposes both instrumented and non-instrumented functions to window + */ + +import * as nonInstrumented from './functions' +import * as instrumented from './instrumented' + +declare global { + interface Window { + testFunctions: { + add1: (a: number, b: number) => number + add2: (a: number, b: number) => number + } + USE_INSTRUMENTED?: boolean + } +} + +// Expose functions to window based on configuration +// The benchmark will set USE_INSTRUMENTED flag before loading this script +if (typeof window !== 'undefined') { + window.testFunctions = window.USE_INSTRUMENTED ? instrumented : nonInstrumented +} diff --git a/test/apps/instrumentation-overhead/src/functions.ts b/test/apps/instrumentation-overhead/src/functions.ts new file mode 100644 index 0000000000..630a0a4c47 --- /dev/null +++ b/test/apps/instrumentation-overhead/src/functions.ts @@ -0,0 +1,12 @@ +/** + * Non-instrumented baseline functions + * These are the original functions without any instrumentation overhead + */ + +export function add1(a: number, b: number): number { + return a + b +} + +export function add2(a: number, b: number): number { + return a + b +} diff --git a/test/apps/instrumentation-overhead/src/instrumented.ts b/test/apps/instrumentation-overhead/src/instrumented.ts new file mode 100644 index 0000000000..e993c7cdbf --- /dev/null +++ b/test/apps/instrumentation-overhead/src/instrumented.ts @@ -0,0 +1,43 @@ +/* eslint-disable camelcase, curly, @typescript-eslint/no-unsafe-return */ + +/** + * Instrumented versions of the functions. + * These follow the debugger instrumentation pattern where $dd_* identifiers + * are injected by the debugger SDK at runtime. + */ + +// Global hooks injected by debugger SDK +declare const $dd_probes: (functionId: string) => any[] | undefined +declare const $dd_entry: (probes: any[], self: any, args: Record) => void +declare const $dd_return: ( + probes: any[], + value: any, + self: any, + args: Record, + locals: Record +) => any +declare const $dd_throw: (probes: any[], error: Error, self: any, args: Record) => void + +export function add1(a: number, b: number): number { + const $dd_p = $dd_probes('instrumented.ts;add1') + try { + if ($dd_p) $dd_entry($dd_p, null, { a, b }) + const result = a + b + return $dd_p ? $dd_return($dd_p, result, null, { a, b }, { result }) : result + } catch (e) { + if ($dd_p) $dd_throw($dd_p, e as Error, null, { a, b }) + throw e + } +} + +export function add2(a: number, b: number): number { + const $dd_p = $dd_probes('instrumented.ts;add2') + try { + if ($dd_p) $dd_entry($dd_p, null, { a, b }) + const result = a + b + return $dd_p ? $dd_return($dd_p, result, null, { a, b }, { result }) : result + } catch (e) { + if ($dd_p) $dd_throw($dd_p, e as Error, null, { a, b 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'none_with_headers', + 'instrumented_no_probes', + 'instrumented_with_probes', +] as const type ScenarioConfiguration = (typeof SCENARIO_CONFIGURATIONS)[number] type TestRunner = (page: Page, takeMeasurements: () => Promise, appUrl: string) => Promise | void @@ -38,8 +46,12 @@ export function createBenchmarkTest(scenarioName: string) { const { stopProfiling, takeMeasurements } = await startProfiling(page, cdpSession) - if (shouldInjectSDK(scenarioConfiguration)) { - await injectSDK(page, scenarioConfiguration, scenarioName) + if (shouldInjectRumSDK(scenarioConfiguration)) { + await injectRumSDK(page, scenarioConfiguration, scenarioName) + } + + if (shouldInjectDebugger(scenarioConfiguration)) { + await injectDebugger(page, scenarioConfiguration, scenarioName) } await runner(page, takeMeasurements, buildAppUrl(server.origin, scenarioConfiguration)) @@ -70,7 +82,7 @@ interface PageInitScriptParameters { scenarioName: string } -async function injectSDK(page: Page, scenarioConfiguration: ScenarioConfiguration, scenarioName: string) { +async function injectRumSDK(page: Page, scenarioConfiguration: ScenarioConfiguration, scenarioName: string) { const configuration: Partial = { clientToken: CLIENT_TOKEN, applicationId: APPLICATION_ID, @@ -116,6 +128,88 @@ async function injectSDK(page: Page, scenarioConfiguration: ScenarioConfiguratio ) } +async function injectDebugger(page: Page, scenarioConfiguration: ScenarioConfiguration, _scenarioName: string) { + // Set flag for app to use instrumented functions + await page.addInitScript(() => { + ;(window as any).USE_INSTRUMENTED = true + }) + + // Load debugger SDK (using local build for now) + await page.addInitScript(() => { + // Define global hooks that instrumented code expects + // These do minimal work that the VM can't optimize away + // Signatures match the real implementations from packages/debugger/src/domain/api.ts + + // Pre-populate with a placeholder key to help V8 optimize property lookups. + // Removing this shows a much larger performance overhead. + // Benchmarks show that using an object is much faster than a Map. + const probesObj: Record = { __placeholder__: undefined } + + // Container used to hold some data manipulated by the $dd_* functions to ensure the VM doesn't optimize them away. + const callCounts = { entry: 0, return: 0, throw: 0 } + + // eslint-disable-next-line @typescript-eslint/no-unsafe-return + ;(window as any).$dd_probes = (functionId: string) => probesObj[functionId] + ;(window as any).$dd_entry = (_probes: any[], _self: any, _args: Record) => { + callCounts.entry++ + } + ;(window as any).$dd_return = ( + _probes: any[], + value: any, + _self: any, + _args: Record, + _locals: Record + ) => { + callCounts.return++ + return value // eslint-disable-line @typescript-eslint/no-unsafe-return + } + ;(window as any).$dd_throw = (_probes: any[], _error: Error, _self: any, _args: Record) => { + callCounts.throw++ + } + + // Variables starting with $_dd are not going to exist in the real code, but are on the global scope in this benchmark to allow the benchmark to modify them. + ;(window as any).$_dd_probesObj = probesObj + ;(window as any).$_dd_callCounts = callCounts + }) + + // Initialize debugger after page loads + await page.addInitScript( + ({ scenarioConfiguration }: { scenarioConfiguration: ScenarioConfiguration }) => { + document.addEventListener('DOMContentLoaded', () => { + // In a real scenario, DD_DEBUGGER would be loaded from a bundle + // For now, we're just testing the instrumentation overhead with the hooks + const browserWindow = window as any + + // Mock init that sets up the hooks properly + if (!browserWindow.DD_DEBUGGER) { + browserWindow.DD_DEBUGGER = { + init: () => { + // Hooks are already defined in the init script + }, + version: 'test', + } + + // Auto-init for testing + browserWindow.DD_DEBUGGER.init() // eslint-disable-line @typescript-eslint/no-unsafe-call + + // Add probe for add1 in instrumented_with_probes scenario. + // In the real SDK, probes are added internally by the delivery API polling, + // not via a public method. Here we write directly to the probes object. + if (scenarioConfiguration === 'instrumented_with_probes') { + browserWindow.$_dd_probesObj['instrumented.ts;add1'] = [ + { + id: 'test-probe', + functionId: 'instrumented.ts;add1', + }, + ] + } + } + }) + }, + { scenarioConfiguration } + ) +} + /** * Warm-up by loading a page to eliminate inflated TTFB seen on the very first load. * Inflated TTFB can come from cold-path costs (DNS resolution, TCP/TLS handshake, etc.). @@ -126,11 +220,17 @@ async function warmup(browser: Browser, url: string) { } async function getSDKVersion(page: Page) { - return await page.evaluate(() => (window as BrowserWindow).DD_RUM?.version || '') + return await page.evaluate( + () => (window as BrowserWindow).DD_RUM?.version || (window as BrowserWindow).DD_DEBUGGER?.version || '' + ) } -function shouldInjectSDK(scenarioConfiguration: ScenarioConfiguration): boolean { - return !['none', 'none_with_headers'].includes(scenarioConfiguration) +function shouldInjectRumSDK(scenarioConfiguration: ScenarioConfiguration): boolean { + return ['rum', 'rum_replay', 'rum_profiling'].includes(scenarioConfiguration) +} + +function shouldInjectDebugger(scenarioConfiguration: ScenarioConfiguration): boolean { + return ['instrumented_no_probes', 'instrumented_with_probes'].includes(scenarioConfiguration) } function buildAppUrl(origin: string, scenarioConfiguration: ScenarioConfiguration): string { @@ -138,6 +238,9 @@ function buildAppUrl(origin: string, scenarioConfiguration: ScenarioConfiguratio if (scenarioConfiguration === 'rum_profiling' || scenarioConfiguration === 'none_with_headers') { url.searchParams.set('profiling', 'true') } + if (scenarioConfiguration === 'instrumented_no_probes' || scenarioConfiguration === 'instrumented_with_probes') { + url.searchParams.set('instrumented', 'true') + } return url.toString() } diff --git a/test/performance/profiling.type.ts b/test/performance/profiling.type.ts index 79c31d47a3..80805d822c 100644 --- a/test/performance/profiling.type.ts +++ b/test/performance/profiling.type.ts @@ -3,6 +3,10 @@ import type { RumPublicApi } from '@datadog/browser-rum-core' export interface BrowserWindow extends Window { DD_RUM?: RumPublicApi + DD_DEBUGGER?: { + init: () => void + version?: string + } __webVitalsMetrics__?: WebVitalsMetrics } diff --git a/test/performance/scenarios/instrumentationOverhead.scenario.ts b/test/performance/scenarios/instrumentationOverhead.scenario.ts new file mode 100644 index 0000000000..9e5252330b --- /dev/null +++ b/test/performance/scenarios/instrumentationOverhead.scenario.ts @@ -0,0 +1,66 @@ +/* eslint-disable @typescript-eslint/no-unsafe-return */ +import { test } from '@playwright/test' +import { createBenchmarkTest } from '../createBenchmarkTest' + +declare global { + interface Window { + testFunctions: { + add1: (a: number, b: number) => number + add2: (a: number, b: number) => number + } + } +} + +test.describe('benchmark', () => { + void createBenchmarkTest('instrumentationOverhead').run(async (page, takeMeasurements, appUrl) => { + // Navigate to app and wait for initial load + await page.goto(appUrl, { waitUntil: 'domcontentloaded' }) + + // WARMUP PHASE: Allow JIT to optimize (100,000+ calls before measurement) + await page.evaluate(() => { + let warmupSum = 0 + for (let i = 0; i < 100_000; i++) { + warmupSum += window.testFunctions.add1(i, i + 1) + warmupSum += window.testFunctions.add2(i, i + 1) + } + console.log('Warmup sum:', warmupSum) // Ensure VM doesn't eliminate warmup + }) + + // Start measuring after warmup + await takeMeasurements() + + // MEASUREMENT PHASE: Heavy stress test + // Benchmark add1, but call add2 occasionally, which under the instrumented_with_probes scenario is instrumented. + // This is to measure if the instrumentation of add2 has an impact on the VM optimization of add1. + await page.evaluate(() => { + let sum1 = 0 + let sum2 = 0 + + const start = performance.now() + for (let i = 0; i < 10_000_000; i++) { + sum1 += window.testFunctions.add1(i, i + 1) + + if (i % 100_000 === 0) { + sum2 += window.testFunctions.add2(i, i + 1) + } + } + const totalTime = performance.now() - start + + // Log accumulated results to ensure VM cannot optimize away function bodies + const callCounts = (window as any).$_dd_callCounts + const message = `Benchmark complete - ${totalTime.toFixed(1)}ms total, sum1: ${sum1}, sum2: ${sum2}${ + callCounts + ? `, instrumentation: entry=${callCounts.entry} return=${callCounts.return} throw=${callCounts.throw}` + : '' + }` + console.log(message) + + // Also set on window so we can retrieve it + ;(window as any).benchmarkResult = { sum1, sum2, totalTime, callCounts } + }) + + // Retrieve and log the result to verify it ran + const result = await page.evaluate(() => (window as any).benchmarkResult) + console.log('Playwright: Benchmark result:', result) + }) +}) diff --git a/test/performance/server.ts b/test/performance/server.ts index fe53ed70f6..da02b15744 100644 --- a/test/performance/server.ts +++ b/test/performance/server.ts @@ -20,6 +20,7 @@ export function startPerformanceServer(scenarioName: string): Promise { const appMap: Record = { heavy: '../apps/react-heavy-spa/dist', shopistLike: '../apps/react-shopist-like/dist', + instrumentationOverhead: '../apps/instrumentation-overhead', } const distPath = path.resolve(import.meta.dirname, appMap[scenarioName])