From 7542b31ee8dadc523df98dd4c416b6312eb8bc0c Mon Sep 17 00:00:00 2001
From: Wolfgang Schoenberger <221313372+wolfiesch@users.noreply.github.com>
Date: Wed, 22 Jul 2026 01:25:08 -0700
Subject: [PATCH] perf(mnemopi): add crossing-inclusive native vector kernel
 benchmark

dim=384 (fastembed bge-small), stride=48B binarized, counts 10/100/1k/10k,
20 warmup + 200 timed iterations per cell, run at 22a5fb3d9. Native wins at
every measured size: cosine batch 1.4-2.9x, vectorIndexTopK 1.6-2x, Hamming
batch 4.5-10x; no break-even crossover above count=10.
---
 .../mnemopi/bench/native-vectors.bench.json   | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 packages/mnemopi/bench/native-vectors.bench.json

diff --git a/packages/mnemopi/bench/native-vectors.bench.json b/packages/mnemopi/bench/native-vectors.bench.json
new file mode 100644
index 000000000..b85048da0
--- /dev/null
+++ b/packages/mnemopi/bench/native-vectors.bench.json
@@ -0,0 +1,93 @@
+{
+  "sha": "22a5fb3d9ff9dfbe63049b6bfa36ce16755d66a8",
+  "date": "2026-07-22T08:24:55.683Z",
+  "scenario": "dim=384, stride=48B, warmup=20, iterations=200, crossing-inclusive",
+  "runtime": "bun 1.3.14",
+  "rows": [
+    {
+      "kernel": "cosineSimilarityBatch",
+      "count": 10,
+      "ts_us": 10.12,
+      "native_us": 3.44,
+      "speedup": 2.94
+    },
+    {
+      "kernel": "cosineSimilarityBatch",
+      "count": 100,
+      "ts_us": 42.43,
+      "native_us": 28.18,
+      "speedup": 1.51
+    },
+    {
+      "kernel": "cosineSimilarityBatch",
+      "count": 1000,
+      "ts_us": 402.47,
+      "native_us": 279.5,
+      "speedup": 1.44
+    },
+    {
+      "kernel": "cosineSimilarityBatch",
+      "count": 10000,
+      "ts_us": 3977.01,
+      "native_us": 2821.78,
+      "speedup": 1.41
+    },
+    {
+      "kernel": "vectorIndexTopK",
+      "count": 10,
+      "ts_us": 5.52,
+      "native_us": 3.49,
+      "speedup": 1.58
+    },
+    {
+      "kernel": "vectorIndexTopK",
+      "count": 100,
+      "ts_us": 31.87,
+      "native_us": 17.73,
+      "speedup": 1.8
+    },
+    {
+      "kernel": "vectorIndexTopK",
+      "count": 1000,
+      "ts_us": 331.28,
+      "native_us": 165.43,
+      "speedup": 2
+    },
+    {
+      "kernel": "vectorIndexTopK",
+      "count": 10000,
+      "ts_us": 3842.08,
+      "native_us": 1890.8,
+      "speedup": 2.03
+    },
+    {
+      "kernel": "hammingDistanceBatch",
+      "count": 10,
+      "ts_us": 3.03,
+      "native_us": 0.67,
+      "speedup": 4.51
+    },
+    {
+      "kernel": "hammingDistanceBatch",
+      "count": 100,
+      "ts_us": 7.05,
+      "native_us": 0.71,
+      "speedup": 9.99
+    },
+    {
+      "kernel": "hammingDistanceBatch",
+      "count": 1000,
+      "ts_us": 28.76,
+      "native_us": 4.02,
+      "speedup": 7.15
+    },
+    {
+      "kernel": "hammingDistanceBatch",
+      "count": 10000,
+      "ts_us": 230.52,
+      "native_us": 39.25,
+      "speedup": 5.87
+    }
+  ],
+  "sink": 469653256.8853176
+}