var Benchmark = require('benchmark');
var suite = new Benchmark.Suite();

suite
.add("byteLength empty string", function () {
  Buffer.byteLength('');
})
.add("byteLength long string", function () {
  Buffer.byteLength('test');
})
// add listeners
.on('cycle', function (event) {
  console.log(String(event.target));
})
.on('complete', function () {
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
})
.run({ async: false });

io.js $ ./iojs ~/git/lab/murmurhash/byte_length.js 
byteLength empty string x 601,367,144 ops/sec ±1.43% (93 runs sampled)
byteLength long string x 5,804,314 ops/sec ±1.69% (94 runs sampled)
Fastest is byteLength empty string
io.js $ iojs ~/git/lab/murmurhash/byte_length.js 
byteLength empty string x 6,169,601 ops/sec ±0.96% (98 runs sampled)
byteLength long string x 5,801,272 ops/sec ±1.05% (92 runs sampled)
Fastest is byteLength empty string