hermes-agent/apps/desktop/scripts/perf/serve.mjs
brooklyn! d1c455acf7
bench(desktop): systematized perf harness; sunset 12 one-off scripts (#67466)
Replaces the dozen ad-hoc measure-*/profile-* scripts (each reinventing the
CDP client — 4 different copies — plus its own arg parsing, stats, output
path, and none with a baseline) with one framework under scripts/perf/:

- lib/cdp.mjs      one CDP client + target discovery + typing + CPU-profile wrapper + DOM selectors
- lib/stats.mjs    percentiles, histograms, CPU-profile self-time ranking
- lib/baseline.mjs load/compare/update baseline + regression gate (new capability)
- lib/launch.mjs   attach, OR spawn a fully ISOLATED instance
- scenarios/*      one module per measurement, registered in scenarios/index.mjs
- run.mjs / serve.mjs, baseline.json, README.md

Isolation solves the long-standing measurement blocker: a running `hgui` held
the Electron single-instance lock, so a second instance quit. `--spawn` /
`perf:serve` launch with their own --user-data-dir (separate lock scope), their
own HERMES_HOME (separate backend/sessions, config seeded from ~/.hermes so it
reaches a chat view without onboarding), and their own --remote-debugging-port.
Synthetic scenarios drive $messages via window.__PERF_DRIVE__, so no LLM credits.

Scenario -> sunset script mapping:
  stream            <- measure-synthetic-stream, profile-synth-stream, profile-long-stream
  stream --real     <- measure-real-stream, profile-real-stream
  keystroke         <- measure-latency, profile-typing, leak-typing
  transcript        <- (new: long-transcript mount cost)
  submit            <- measure-submit, measure-jump
  session-switch    <- profile-session-switch
  profile-switch    <- measure-profile-switch
CPU profiling is now a cross-cutting --cpuprofile flag, not 5 separate scripts.

CI-tier scenarios (stream, keystroke, transcript) need no backend/credits and
are gated against baseline.json (seed values; re-capture with --update-baseline
on a reference device). Backend-tier scenarios are report-only.

perf-probe.tsx gains loadTranscript() for the transcript scenario. No core
files touched; isolation is via CLI args, not env-gated app changes.

Verified: node --check all modules, tsc, eslint, and a unit smoke of the
stats + regression-gate logic. The end-to-end GUI run (which opens a window)
is left to run interactively via `npm run perf -- --spawn`.
2026-07-19 07:41:00 -04:00

40 lines
1.2 KiB
JavaScript

// Launch a standalone, fully isolated perf instance and leave it running so you
// can attach the harness (`npm run perf`) or DevTools to it. Ctrl-C tears it
// down and removes its temp dirs.
//
// npm run perf:serve # :9222, temp HERMES_HOME + user-data-dir
// PERF_PORT=9333 npm run perf:serve # custom CDP port
//
// This is the isolation seam: because it uses its own --user-data-dir the
// Electron single-instance lock never collides with a running `hgui`.
import { startIsolatedInstance } from './lib/launch.mjs'
const port = Number(process.env.PERF_PORT ?? 9222)
const devPort = Number(process.env.PERF_DEV_PORT ?? 5174)
console.log(`[perf:serve] starting isolated instance (CDP :${port}, dev :${devPort})…`)
const instance = await startIsolatedInstance({
port,
devPort,
hermesHome: process.env.PERF_HERMES_HOME,
userDataDir: process.env.PERF_USER_DATA
})
console.log(`[perf:serve] READY — attach with: npm run perf -- --port ${port}`)
let closing = false
const shutdown = () => {
if (closing) {
return
}
closing = true
console.log('\n[perf:serve] tearing down…')
instance.teardown()
process.exit(0)
}
process.on('SIGINT', shutdown)
process.on('SIGTERM', shutdown)