Hermes-agent

2026-06-14 14:30:48 -04:00
commit dac4b88b94
5058 changed files with 1884848 additions and 0 deletions
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+// CPU-profile a synthetic stream — outputs a .cpuprofile and a top-self ranking.
+// Open the .cpuprofile in Chrome DevTools Performance panel for a flamegraph.
+
+import { writeFileSync } from 'node:fs'
+
+const CDP_HTTP = 'http://127.0.0.1:9222'
+const TOKENS = Number(process.env.TOKENS || 400)
+const INTERVAL_MS = Number(process.env.INTERVAL_MS || 8)
+const CHUNK = process.env.CHUNK || '**word** in _italic_ with `code` '
+const LABEL = process.env.LABEL || 'profile'
+const OUT = process.env.OUT || `synth-${LABEL}.cpuprofile`
+
+class CDP {
+  constructor(ws) { this.ws = ws; this.id = 0; this.pending = new Map() }
+  static async open(url) {
+    const ws = new WebSocket(url)
+    await new Promise((r) => ws.addEventListener('open', r, { once: true }))
+    const cdp = new CDP(ws)
+    ws.addEventListener('message', (ev) => {
+      const m = JSON.parse(ev.data.toString())
+      if (m.id != null && cdp.pending.has(m.id)) {
+        const { resolve, reject } = cdp.pending.get(m.id)
+        cdp.pending.delete(m.id)
+        if (m.error) reject(new Error(m.error.message))
+        else resolve(m.result)
+      }
+    })
+    return cdp
+  }
+  send(method, params) {
+    const id = ++this.id
+    return new Promise((res, rej) => {
+      this.pending.set(id, { resolve: res, reject: rej })
+      this.ws.send(JSON.stringify({ id, method, params }))
+    })
+  }
+  async eval(expr) {
+    const r = await this.send('Runtime.evaluate', { expression: expr, returnByValue: true, awaitPromise: true })
+    if (r.exceptionDetails) throw new Error(r.exceptionDetails.exception?.description || 'eval')
+    return r.result.value
+  }
+  close() { this.ws.close() }
+}
+
+async function main() {
+  const list = await (await fetch(`${CDP_HTTP}/json`)).json()
+  const target = list.find((t) => t.type === 'page' && /5174/.test(t.url))
+  const cdp = await CDP.open(target.webSocketDebuggerUrl)
+
+  if (!await cdp.eval('!!window.__PERF_DRIVE__')) {
+    console.error('no __PERF_DRIVE__')
+    cdp.close()
+    process.exit(2)
+  }
+
+  await cdp.send('Profiler.enable')
+  // High-resolution sampling: 100us
+  await cdp.send('Profiler.setSamplingInterval', { interval: 100 })
+  await cdp.send('Profiler.start')
+
+  await cdp.eval(`window.__PERF_DRIVE__.stream({ chunk: ${JSON.stringify(CHUNK)}, intervalMs: ${INTERVAL_MS}, totalTokens: ${TOKENS} })`)
+  await new Promise((r) => setTimeout(r, TOKENS * INTERVAL_MS + 1500))
+  await cdp.eval('window.__PERF_DRIVE__.reset()')
+
+  const { profile } = await cdp.send('Profiler.stop')
+  writeFileSync(OUT, JSON.stringify(profile))
+  console.log('wrote', OUT)
+
+  // Compute top self time per function.
+  const samples = profile.samples || []
+  const timeDeltas = profile.timeDeltas || []
+  const nodes = new Map(profile.nodes.map((n) => [n.id, n]))
+  const selfTime = new Map() // id -> microseconds
+  for (let i = 0; i < samples.length; i++) {
+    const id = samples[i]
+    const dt = timeDeltas[i] ?? 0
+    selfTime.set(id, (selfTime.get(id) || 0) + dt)
+  }
+  const ranked = [...selfTime.entries()]
+    .map(([id, us]) => {
+      const n = nodes.get(id)
+      const cf = n?.callFrame || {}
+      return {
+        us,
+        ms: us / 1000,
+        name: cf.functionName || '(anonymous)',
+        url: (cf.url || '').slice(-60),
+        line: cf.lineNumber
+      }
+    })
+    .filter((x) => !/\(root\)|\(idle\)|\(garbage collector\)|\(program\)/.test(x.name))
+    .sort((a, b) => b.us - a.us)
+    .slice(0, 30)
+
+  console.log('\n=== TOP 30 SELF TIME (ms) ===')
+  for (const r of ranked) {
+    console.log(`${r.ms.toFixed(1).padStart(7)}  ${r.name.padEnd(40)}  ${r.url}:${r.line}`)
+  }
+
+  cdp.close()
+}
+
+main().catch((e) => { console.error(e); process.exit(1) })