Add Axum backend experiment

alt/bench.mjs

@@ -0,0 +1,39 @@
+#!/usr/bin/env node
+const base = process.argv[2];
+if (!base) { console.error('usage: node alt/bench.mjs <baseUrl> [--duration-ms=10000]'); process.exit(2); }
+const duration = Number(process.argv.find(x => x.startsWith('--duration-ms='))?.split('=')[1]) || 10000;
+const cachedId = process.env.TEST_MEDIA_ID || 'dQw4w9WgXcQ';
+const query = encodeURIComponent(process.env.BENCH_QUERY || 'ytplayer-bench-seed');
+const manifest = await (await fetch(new URL('/api/manifest', base))).json();
+const cssHash = manifest.files?.['/styles.css']?.h;
+const targets = [
+  ['version', '/api/version'],
+  ['static', `/styles.css${cssHash ? `?v=${cssHash}` : ''}`],
+  ['cached-search', `/api/search?q=${query}`],
+  ['media-range', `/api/media/${cachedId}?g=1`, { Range: 'bytes=0-1048575' }],
+];
+async function run(label, path, concurrency, headers = {}) {
+  let count = 0, responseBytes = 0, errors = 0;
+  const latencies = [];
+  const until = Date.now() + duration;
+  async function worker() {
+    while (Date.now() < until) {
+      const start = performance.now();
+      try {
+        const response = await fetch(new URL(path, base), { headers });
+        const body = await response.arrayBuffer();
+        responseBytes += body.byteLength;
+        if (!response.ok) errors++;
+      } catch { errors++; }
+      latencies.push(performance.now() - start);
+      count++;
+    }
+  }
+  await Promise.all(Array.from({ length: concurrency }, worker));
+  latencies.sort((a, b) => a - b);
+  const pick = p => latencies[Math.min(latencies.length - 1, Math.floor(latencies.length * p))] || 0;
+  return { route: label, concurrency, durationMs: duration, requests: count, rps: +(count / (duration / 1000)).toFixed(1), responseBytes, errors, p50Ms: +pick(.5).toFixed(1), p95Ms: +pick(.95).toFixed(1), p99Ms: +pick(.99).toFixed(1) };
+}
+for (const concurrency of [1, 10, 50, 200]) {
+  for (const [label, path, headers] of targets) console.log(JSON.stringify(await run(label, path, concurrency, headers)));
+}