drupal_yaml_parsing.php

<?php

require './core/vendor/autoload.php';
use Symfony\Component\Yaml\Parser;

function quantile($values, $p) {
  sort($values);
  $H = (count($values) - 1) * $p + 1;
  $h = floor($H);
  $v = $values[$h - 1];
  $e = $H - $h;
  return $e ? $v + $e * ($values[$h] - $v) : $v;
}

function sumarize($values) {
  $output = array();
  $output['min'] = number_format(min($values), 4);
  $output['max'] = number_format(max($values), 4);
  $output['mean'] = number_format(array_sum($values) / count($values), 4);
  $output['median'] = number_format(quantile($values, 0.5), 4);
  $output['95th'] = number_format(quantile($values, 0.95), 4);
  return $output;
}

$file_list = shell_exec('find core| grep -v vendor | grep \.yml$');
$files = array_filter(explode("\n", $file_list));

$extension_times = array();
$symfony_times = array();

foreach ($files as $file) {
  $start = microtime(TRUE);
  $extension = yaml_parse_file($file);
  $extension_times[] = (microtime(TRUE) - $start) * 1000;

  $parser = new Parser();
  $start = microtime(TRUE);
  $symfony = $parser->parse(file_get_contents($file));
  $symfony_times[] = (microtime(TRUE) - $start) * 1000;
}

print yaml_emit(array('extension' => sumarize($extension_times)));
print yaml_emit(array('symfony' => sumarize($symfony_times)));

Nice one :) I'll try to merge the summary() + quantile() functions into my bench.php script.