stdout and stderr pipe bechmark

result.log

$ node ./test.js
test: 262ms
GOT: 10240 KB
use pipe: no
$ node ./test.js
test: 248ms
GOT: 10240 KB
use pipe: no
$ node ./test.js
test: 257ms
GOT: 10240 KB
use pipe: no
$ node ./test.js
test: 248ms
GOT: 10240 KB
use pipe: no
$ node ./test.js pipe
test: 307ms
GOT: 10240 KB
use pipe: yes
$ node ./test.js pipe
test: 301ms
GOT: 10240 KB
use pipe: yes
$ node ./test.js pipe
test: 295ms
GOT: 10240 KB
use pipe: yes
$ node ./test.js pipe
test: 298ms
GOT: 10240 KB
use pipe: yes

test.js

var childProcess = require('child_process');

//Child
if (process.argv[2] === 'child') {

  var oneKB = (new Array(1025)).join('a');

  for (var i = 0; i < 10000; i++) {
    process.stdout.write(oneKB);
  }
}

//Parent
else if (process.argv[2] === 'parent') {

  var doPipe = process.argv[3] == 'pipe';

  var child = childProcess.fork(process.argv[1], ['child'], doPipe ? {silent: true} : undefined);

  if (doPipe) {
    child.stdout.pipe(process.stdout, {end: false});
    child.stderr.pipe(process.stderr, {end: false});
  }

  child._channel.close();
  child._channel = null;

  child.on('exit', function () {
    process.exit(0);
  });
}

//testcase
else {
  console.time('test');
  var parent = childProcess.spawn(process.execPath, [process.argv[1], 'parent', process.argv[2]]);

  var byte = 0;
  parent.stdout.on('data', function (data) {
    byte += data.length;
  });

  parent.on('exit', function () {
    console.timeEnd('test');
    console.log('GOT: ' + (byte/1000) + ' KB');
    console.log('use pipe: ' + (process.argv[2] === 'pipe' ? 'yes' : 'no'));
  });
}