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devlow-bench.mjs
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import { rm, writeFile, readFile } from 'node:fs/promises'
import { join, resolve } from 'node:path'
import { fileURLToPath } from 'node:url'
import { describe } from '@vercel/devlow-bench'
import * as devlow from '@vercel/devlow-bench'
import { newBrowserSession } from '@vercel/devlow-bench/browser'
import { command } from '@vercel/devlow-bench/shell'
import { waitForFile } from '@vercel/devlow-bench/file'
const REPO_ROOT = fileURLToPath(new URL('..', import.meta.url))
const START_SERVER_REGEXP = /Ready in \d+/
const URL_REGEXP = /Local:\s+(?<url>.+)\n/
const GIT_SHA =
process.env.GITHUB_SHA ??
(await (async () => {
const cmd = command('git', ['rev-parse', 'HEAD'])
await cmd.ok()
return cmd.output
})())
const GIT_BRANCH =
process.env.GITHUB_REF_NAME ??
(await (async () => {
const cmd = command('git', ['rev-parse', '--abbrev-ref', 'HEAD'])
await cmd.ok()
return cmd.output
})())
const nextBuildWorkflow =
(benchmarkName, benchDir, pages, enableTurbopackCache) =>
async ({ turbopack, page }) => {
const pageConfig =
typeof pages[page] === 'string' ? { url: pages[page] } : pages[page]
const cleanupTasks = []
try {
const env = {
TURBO_CACHE: enableTurbopackCache ? '1' : '0',
PATH: process.env.PATH,
NODE: process.env.NODE,
HOSTNAME: process.env.HOSTNAME,
PWD: process.env.PWD,
NEXT_TRACE_UPLOAD_DISABLED: 'true',
NEXT_PRIVATE_SKIP_CANARY_CHECK: 'true',
// Enable next.js test mode to get HMR events and silence canary only
__NEXT_TEST_MODE: '1',
}
const serverEnv = {
...env,
PORT: '0',
}
const benchmarkDir = resolve(REPO_ROOT, 'bench', benchDir)
// cleanup .next directory to remove persistent cache
await retry(() =>
rm(join(benchmarkDir, '.next'), { recursive: true, force: true })
)
await measureTime('cleanup', {
scenario: benchmarkName,
props: { turbopack, page },
})
const buildArgs = [turbopack ? 'build-turbopack' : 'build-webpack']
let buildShell = command('pnpm', buildArgs, {
cwd: benchmarkDir,
env,
})
await buildShell.ok()
await measureTime('build', {
scenario: benchmarkName,
props: { turbopack, page },
})
// startup browser
let session = await newBrowserSession({})
const closeSession = async () => {
if (session) {
await session.close()
session = null
}
}
cleanupTasks.push(closeSession)
await measureTime('browser startup', {
props: { turbopack, page },
})
// run command to start dev server
const startArgs = [turbopack ? 'start-turbopack' : 'start-webpack']
let shell = command('pnpm', startArgs, {
cwd: benchmarkDir,
env: serverEnv,
})
const killShell = async () => {
if (shell) {
await shell.kill()
shell = null
}
}
cleanupTasks.push(killShell)
// wait for server to be ready
const {
groups: { url },
} = await shell.waitForOutput(URL_REGEXP)
// wait for server to be ready
await shell.waitForOutput(START_SERVER_REGEXP)
await measureTime('server startup', { props: { turbopack, page } })
await shell.reportMemUsage('mem usage after startup', {
props: { turbopack, page },
})
// open page
const pageInstance = await session.hardNavigation(
'open page',
url + pageConfig.url
)
await shell.reportMemUsage('mem usage after open page')
let status = 0
try {
if (
await pageInstance.evaluate(
'!next.appDir && __NEXT_DATA__.page === "/404"'
)
) {
status = 2
}
} catch (e) {
status = 2
}
try {
if (
!(await pageInstance.evaluate(
'next.appDir || __NEXT_DATA__.page && !__NEXT_DATA__.err'
))
) {
status = 1
}
} catch (e) {
status = 1
}
await reportMeasurement('page status', status, 'status code')
// reload page
await session.reload('reload page')
await reportMeasurement(
'console output',
shell.output.split(/\n/).length,
'lines'
)
// close browser
await killShell()
await closeSession()
await measureTime('before build with cache', {
scenario: benchmarkName,
props: { turbopack, page },
})
buildShell = command('pnpm', buildArgs, {
cwd: benchmarkDir,
env,
})
await buildShell.ok()
await measureTime('build with cache', {
scenario: benchmarkName,
props: { turbopack, page },
})
// startup new browser
session = await newBrowserSession({})
await measureTime('browser startup', {
props: { turbopack, page },
})
// run command to start dev server
shell = command('pnpm', startArgs, {
cwd: benchmarkDir,
env: serverEnv,
})
// wait for server to be ready
const {
groups: { url: url2 },
} = await shell.waitForOutput(URL_REGEXP)
await shell.reportMemUsage('mem usage after startup with cache')
// open page
await session.hardNavigation(
'open page with cache',
url2 + pageConfig.url
)
await reportMeasurement(
'console output with cache',
shell.output.split(/\n/).length,
'lines'
)
await shell.reportMemUsage('mem usage after open page with cache')
} catch (e) {
throw e
} finally {
// This must run in order
// eslint-disable-next-line no-await-in-loop
for (const task of cleanupTasks.reverse()) await task()
await measureTime('shutdown')
}
}
const nextDevWorkflow =
(benchmarkName, benchDir, pages) =>
async ({ turbopack, page }) => {
const pageConfig =
typeof pages[page] === 'string' ? { url: pages[page] } : pages[page]
const cleanupTasks = []
try {
const benchmarkDir = resolve(REPO_ROOT, 'bench', benchDir)
// cleanup .next directory to remove persistent cache
await retry(() =>
rm(join(benchmarkDir, '.next'), { recursive: true, force: true })
)
await measureTime('cleanup', {
scenario: benchmarkName,
props: { turbopack, page },
})
// startup browser
let session = await newBrowserSession({})
const closeSession = async () => {
if (session) {
await session.close()
session = null
}
}
cleanupTasks.push(closeSession)
await measureTime('browser startup', {
props: { turbopack, page },
})
const env = {
PATH: process.env.PATH,
NODE: process.env.NODE,
HOSTNAME: process.env.HOSTNAME,
PWD: process.env.PWD,
// Disable otel initialization to prevent pending / hanging request to otel collector
OTEL_SDK_DISABLED: 'true',
NEXT_PUBLIC_OTEL_SENTRY: 'true',
NEXT_PUBLIC_OTEL_DEV_DISABLED: 'true',
NEXT_TRACE_UPLOAD_DISABLED: 'true',
// Enable next.js test mode to get HMR events and silence canary only
__NEXT_TEST_MODE: '1',
}
const serverEnv = {
...env,
PORT: '0',
}
// run command to start dev server
const args = [turbopack ? 'dev-turbopack' : 'dev-webpack']
let shell = command('pnpm', args, {
cwd: benchmarkDir,
env: serverEnv,
})
const killShell = async () => {
if (shell) {
await shell.kill()
shell = null
}
}
cleanupTasks.push(killShell)
// wait for server to be ready
const {
groups: { url },
} = await shell.waitForOutput(URL_REGEXP)
// wait for server to be ready
await shell.waitForOutput(START_SERVER_REGEXP)
await measureTime('server startup', { props: { turbopack, page } })
await shell.reportMemUsage('mem usage after startup', {
props: { turbopack, page },
})
// open page
const pageInstance = await session.hardNavigation(
'open page',
url + pageConfig.url
)
await shell.reportMemUsage('mem usage after open page')
let status = 0
try {
if (
await pageInstance.evaluate(
'!next.appDir && __NEXT_DATA__.page === "/404"'
)
) {
status = 2
}
} catch (e) {
status = 2
}
try {
if (
!(await pageInstance.evaluate(
'next.appDir || __NEXT_DATA__.page && !__NEXT_DATA__.err'
))
) {
status = 1
}
} catch (e) {
status = 1
}
await reportMeasurement('page status', status, 'status code')
// reload page
await session.reload('reload page')
await reportMeasurement(
'console output',
shell.output.split(/\n/).length,
'lines'
)
// HMR
if (pageConfig.hmr) {
let hmrEvent = () => {}
pageInstance.exposeBinding(
'TURBOPACK_HMR_EVENT',
(_source, latency) => {
hmrEvent(latency)
}
)
const { file, before, after } = pageConfig.hmr
const path = resolve(benchmarkDir, file)
const content = await readFile(path, 'utf8')
cleanupTasks.push(async () => {
await writeFile(path, content, 'utf8')
})
let currentContent = content
/* eslint-disable no-await-in-loop */
for (let hmrAttempt = 0; hmrAttempt < 10; hmrAttempt++) {
if (hmrAttempt > 0) {
await new Promise((resolve) => {
setTimeout(resolve, 1000)
})
}
const linesStart = shell.output.split(/\n/).length
let reportedName
if (hmrAttempt < 3) {
reportedName = 'hmr/warmup'
} else {
reportedName = 'hmr'
}
await pageInstance.evaluate(
'window.__NEXT_HMR_CB = (arg) => TURBOPACK_HMR_EVENT(arg); window.__NEXT_HMR_LATENCY_CB = (arg) => TURBOPACK_HMR_EVENT(arg);'
)
// eslint-disable-next-line no-loop-func
const hmrDone = new Promise((resolve) => {
let once = true
const end = async (code) => {
const success = code <= 1
if (!success && !reportedName) reportedName = 'hmr'
if (reportedName) {
await reportMeasurement(
`${reportedName}/status`,
code,
'status code'
)
}
clearTimeout(timeout)
resolve(success)
}
cleanupTasks.push(async () => {
if (!once) return
once = false
await end(3)
})
const timeout = setTimeout(async () => {
if (!once) return
once = false
await end(2)
}, 60000)
hmrEvent = async (latency) => {
if (!once) return
once = false
if (reportedName) {
if (typeof latency === 'number') {
await reportMeasurement(
`${reportedName}/reported latency`,
latency,
'ms'
)
}
await measureTime(reportedName, {
relativeTo: `${reportedName}/start`,
})
}
await end(0)
}
pageInstance.once('load', async () => {
if (!once) return
once = false
if (reportedName) {
await measureTime(reportedName, {
relativeTo: `${reportedName}/start`,
})
}
await end(1)
})
})
const idx = before
? currentContent.indexOf(before)
: currentContent.indexOf(after) + after.length
let newContent = `${currentContent}\n\n/* HMR */`
if (file.endsWith('.tsx')) {
newContent = `${currentContent.slice(
0,
idx
)}<div id="hmr-test">HMR</div>${currentContent.slice(idx)}`
} else if (file.endsWith('.css')) {
newContent = `${currentContent.slice(
0,
idx
)}\n--hmr-test-${hmrAttempt}: 0;\n${currentContent.slice(idx)}`
} else if (file.endsWith('.mdx')) {
newContent = `${currentContent.slice(
0,
idx
)}\n\nHMR\n\n${currentContent.slice(idx)}`
}
if (reportedName) {
await measureTime(`${reportedName}/start`)
}
if (currentContent === newContent) {
throw new Error("HMR didn't change content")
}
await writeFile(path, newContent, 'utf8')
currentContent = newContent
const success = await hmrDone
if (reportedName) {
await reportMeasurement(
`console output/${reportedName}`,
shell.output.split(/\n/).length - linesStart,
'lines'
)
}
if (!success) break
}
/* eslint-enable no-await-in-loop */
}
if (turbopack) {
// close dev server and browser
await killShell()
await closeSession()
} else {
// wait for persistent cache to be written
const waitPromise = new Promise((resolve) => {
setTimeout(resolve, 5000)
})
const cacheLocation = join(
benchmarkDir,
'.next',
'cache',
'webpack',
'client-development'
)
await Promise.race([
waitForFile(join(cacheLocation, 'index.pack')),
waitForFile(join(cacheLocation, 'index.pack.gz')),
])
await measureTime('cache created')
await waitPromise
await measureTime('waiting')
// close dev server and browser
await killShell()
await closeSession()
}
// startup new browser
session = await newBrowserSession({})
await measureTime('browser startup', {
props: { turbopack, page },
})
// run command to start dev server
shell = command('pnpm', args, {
cwd: benchmarkDir,
env: serverEnv,
})
// wait for server to be ready
const {
groups: { url: url2 },
} = await shell.waitForOutput(URL_REGEXP)
await shell.reportMemUsage('mem usage after startup with cache')
// open page
await session.hardNavigation(
'open page with cache',
url2 + pageConfig.url
)
await reportMeasurement(
'console output with cache',
shell.output.split(/\n/).length,
'lines'
)
await shell.reportMemUsage('mem usage after open page with cache')
} finally {
// This must run in order
// eslint-disable-next-line no-await-in-loop
for (const task of cleanupTasks.reverse()) await task()
await measureTime('shutdown')
}
}
const pages = {
homepage: {
url: '/',
hmr: {
file: 'components/lodash.js',
before: '<h1>Client Component</h1>',
},
},
}
describe(
'heavy-npm-deps-dev',
{
turbopack: true,
mode: 'dev',
page: Object.keys(pages),
},
nextDevWorkflow('heavy-npm-deps', 'heavy-npm-deps', pages)
)
describe(
'heavy-npm-deps-build',
{
turbopack: true,
mode: 'build',
page: Object.keys(pages),
},
nextBuildWorkflow('heavy-npm-deps', 'heavy-npm-deps', pages, false)
)
describe(
'heavy-npm-deps-build-turbo-cache-enabled',
{
turbopack: true,
mode: 'build',
page: Object.keys(pages),
},
nextBuildWorkflow(
'heavy-npm-deps-build-turbo-cache-enabled',
'heavy-npm-deps',
pages,
true
)
)
async function retry(fn) {
let lastError
for (let i = 100; i < 2000; i += 100) {
try {
// eslint-disable-next-line no-await-in-loop
await fn()
return
} catch (e) {
lastError = e
// eslint-disable-next-line no-await-in-loop
await new Promise((resolve) => {
setTimeout(resolve, i)
})
}
}
throw lastError
}
function measureTime(name, options) {
return devlow.measureTime(name, {
props: {
git_sha: GIT_SHA,
git_branch: GIT_BRANCH,
...options?.props,
},
...options,
})
}
function reportMeasurement(name, value, unit, options) {
return devlow.reportMeasurement(name, value, unit, {
props: {
git_sha: GIT_SHA,
git_branch: GIT_BRANCH,
...options?.props,
},
...options,
})
}