benchmark against node:zlib.crc32 implementation

benchmarks/crc.bench.js

@@ -0,0 +1,24 @@
+const bench = require('micro-bmark');
+const crc32 = require('..');
+const zlib = require('node:zlib');
+
+const smallBuffer = Buffer.from([0, 1, 2, 3, 4, 5]);
+const largeBuffer = Buffer.alloc(100000);
+
+// Do a few iterations first to get insight into the performance before JIT optimization.
+bench.mark(' few iterations, small buffer, native', 10, () => zlib.crc32(smallBuffer));
+bench.mark(' few iterations, small buffer, js    ', 10, () => crc32.unsigned(smallBuffer));
+bench.mark(' few iterations, large buffer, native', 10, () => zlib.crc32(largeBuffer));
+bench.mark(' few iterations, large buffer, js    ', 10, () => crc32.unsigned(largeBuffer));
+
+// Run many iterations to warm up the JIT optimization.
+bench.mark('(warm up. ignore)', 10000, () => zlib.crc32(smallBuffer));
+bench.mark('(warm up. ignore)', 10000, () => crc32.unsigned(smallBuffer));
+bench.mark('(warm up. ignore)', 10000, () => zlib.crc32(largeBuffer));
+bench.mark('(warm up. ignore)', 10000, () => crc32.unsigned(largeBuffer));
+
+// Then collect data once the optimization has presumably reached a steady state.
+bench.mark('many iterations, small buffer, native', 20000, () => zlib.crc32(smallBuffer));
+bench.mark('many iterations, small buffer, js    ', 20000, () => crc32.unsigned(smallBuffer));
+bench.mark('many iterations, large buffer, native', 20000, () => zlib.crc32(largeBuffer));
+bench.mark('many iterations, large buffer, js    ', 20000, () => crc32.unsigned(largeBuffer));

package.json

@@ -22,12 +22,14 @@
   },
   "scripts": {
     "test": "tap tests/*.test.js --reporter classic",
+    "benchmark": "node benchmarks/crc.bench.js",
     "build": "npx [email protected] && npx cpy-cli index.d.ts dist --rename=index.d.cts && npx cpy-cli index.d.ts dist --rename=index.d.mts",
     "prepublishOnly": "npm run build",
     "format": "prettier --write --log-level warn \"**/*.{json,md,js}\""
   },
   "dependencies": {},
   "devDependencies": {
+    "micro-bmark": "^0.3.1",
     "prettier": "^3.2.4",
     "tap": "~11.1.5"
   },