Node.js Buffer#copy performance

results.txt

Node.js 0.4.12
--------------

Buffer (10 bytes):

Buffer#copy x 233,570 ops/sec ±0.96% (74 runs sampled)
Buffer[] x 1,152,607 ops/sec ±2.57% (72 runs sampled)
Fastest is Buffer[]


Buffer (50 bytes):

Buffer#copy x 219,542 ops/sec ±0.69% (80 runs sampled)
Buffer[] x 698,666 ops/sec ±1.14% (74 runs sampled)
Fastest is Buffer[]


Buffer (250 bytes):

Buffer#copy x 187,207 ops/sec ±1.46% (70 runs sampled)
Buffer[] x 222,829 ops/sec ±2.38% (75 runs sampled)
Fastest is Buffer[]


Buffer (1000 bytes):

Buffer#copy x 144,450 ops/sec ±1.59% (76 runs sampled)
Buffer[] x 68,145 ops/sec ±1.91% (75 runs sampled)
Fastest is Buffer#copy


Node.js 0.5.10-pre (c8646e0c4159aa53b2ae94d1b69850ce5fa62ca2)
-------------------------------------------------------------

Buffer (10 bytes):

Buffer#copy x 1,454,959 ops/sec ±0.77% (78 runs sampled)
Buffer[] x 2,387,791 ops/sec ±0.72% (78 runs sampled)
Fastest is Buffer[]


Buffer (50 bytes):

Buffer#copy x 1,334,755 ops/sec ±0.57% (79 runs sampled)
Buffer[] x 1,794,093 ops/sec ±1.77% (79 runs sampled)
Fastest is Buffer[]


Buffer (250 bytes):

Buffer#copy x 1,004,576 ops/sec ±1.64% (69 runs sampled)
Buffer[] x 954,116 ops/sec ±3.93% (71 runs sampled)
Fastest is Buffer#copy


Buffer (1000 bytes):

Buffer#copy x 560,584 ops/sec ±7.60% (66 runs sampled)
Buffer[] x 368,210 ops/sec ±4.48% (74 runs sampled)
Fastest is Buffer#copy

test.js

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

var subject = new Buffer(10);

// tests
suite.add('Buffer#copy', function() {
  var target = new Buffer(subject.length);
  subject.copy(target);
})
.add('Buffer[]', function() {
  var target = new Buffer(subject.length);
  for (var i = 0, l = subject.length; i < l; i++) {
    target[i] = subject[i];
  }
})
// add listeners
.on('cycle', function(event, bench) {
  console.log(String(bench));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
})
// run async
.run({ 'async': true });