0.2.88

tests/broadcast-load-simulation.mjs

@@ -0,0 +1,27 @@
+import assert from 'node:assert/strict';
+import { performance } from 'node:perf_hooks';
+// Deterministic broadcast/access-check simulation. Not a live WebSocket/DB benchmark.
+const durationSeconds = 10;
+const editsPerUserPerSecond = 2;
+for (const users of [5, 100, 300, 500]) {
+  const checks = new Int32Array(users);
+  const lastCheckSecond = new Int32Array(users).fill(-1);
+  const start = performance.now();
+  let fanouts = 0;
+  for (let second = 0; second < durationSeconds; second++) {
+    for (let event = 0; event < users * editsPerUserPerSecond; event++) {
+      for (let recipient = 0; recipient < users; recipient++) {
+        fanouts++;
+        if (lastCheckSecond[recipient] !== second) {
+          checks[recipient]++;
+          lastCheckSecond[recipient] = second;
+        }
+      }
+    }
+  }
+  const optimized = checks.reduce((a,b) => a+b, 0);
+  const baseline = fanouts;
+  assert.equal(optimized, users * durationSeconds);
+  assert.ok(optimized <= baseline);
+  console.log(`${users} clients | ${fanouts.toLocaleString('en-US')} broadcast deliveries | auth reads: ${baseline.toLocaleString('en-US')} -> ${optimized.toLocaleString('en-US')} | reduction ${(100*(1-optimized/baseline)).toFixed(2)}% | simulation ${(performance.now()-start).toFixed(1)} ms`);
+}