ExtensionDiscovery benchmark script

bench.php

<?php
# Simple PHP 5.4+ bench script for CLI.

use Symfony\Component\HttpFoundation\Request;

const ITERATIONS = 1;

error_reporting(E_ALL | E_STRICT);
require_once 'core/vendor/autoload.php';
require_once 'core/includes/bootstrap.inc';
//$request = Request::create('');
//$request->overrideGlobals();
$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
restore_error_handler();
restore_exception_handler();
register_shutdown_function(function () {
  echo PHP_EOL;
  $memory_peak_end = memory_get_peak_usage();
  echo 'Peak memory after test: ', format_kb($memory_peak_end), PHP_EOL;
  echo 'Memory difference: ', format_kb($memory_peak_end, MEMORY_PEAK_START), PHP_EOL;
});
function format_kb($size, $diff_base_size = NULL) {
  $out = '';
  if (isset($diff_base_size)) {
    $out = ($size = $size - $diff_base_size) > 0 ? '+' : '';
  }
  $out .= number_format($size / 1024) . ' KB';
  return $out;
}
function no_op($text) {
  return $text;
}

/**
 * Pollute memory.
 */
require_once 'core/includes/file.inc';
require_once 'core/includes/common.inc';

// Finder tests.
//$loader = drupal_classloader();
//$loader->registerNamespace('Symfony\Component\Finder', dirname(__DIR__) . '\symfony\src');

/**
 * Initialization.
 */
if (file_exists(DRUPAL_ROOT . '/.git/HEAD')) {
  readfile(DRUPAL_ROOT . '/.git/HEAD');
}
define('MEMORY_PEAK_START', memory_get_peak_usage());
echo 'Peak memory before test: ', format_kb(MEMORY_PEAK_START), PHP_EOL;
echo 'Iterations: ', ITERATIONS, PHP_EOL, PHP_EOL;


$tests['nothing'] = function () {
};
$tests['no_op()'] = function () {
  $text = no_op('some string');
};

/**
 * Test cases.
 */

$tests['file_scan_directory'] = function () {
  $dir = 'core/modules';
  $mask = '/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info\.yml$/';
  return file_scan_directory($dir, $mask, array(
    'key' => 'name',
    // Do not recurse into ./lib directories; they cannot contain extensions.
    // We also skip templates, css, and js directories.
    // @todo Find a way to skip ./config directories (but not modules/config).
    'nomask' => '/^(CVS|lib|templates|css|js)$/',
  ));
};

# Actual Finder.
# Note: This is just core/modules ONLY.
$tests['Finder'] = function () {
  if (!class_exists('Symfony\Component\Finder\Finder')) {
    return 'Finder not available.';
  }
  $mask = '/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info\.yml$/';
  $extension = 'info.yml';
  $finder = new Symfony\Component\Finder\Finder();
  $finder
    ->files()
    ->depth('> 1')
    ->name($mask)
    ->exclude(array('lib', 'templates', 'js', 'css', 'config'))
    ->in('core/modules');
  
  $files = array();
  foreach ($finder as $file) {
    $file->uri = $file->getPathName();
    $file->filename = $file->getFileName();
    $file->name = pathinfo($file->filename, PATHINFO_FILENAME);
    $files[$file->name] = $file;
  }
};

# What Finder is doing under the hood:
# Note: This is just core/modules ONLY.
$tests['FinderExposed'] = function () {
  $dir = 'core/modules';
  $mask = '/\/' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info\.yml$/';
  $flags = FilesystemIterator::UNIX_PATHS | FilesystemIterator::SKIP_DOTS;
  $flags |= FilesystemIterator::CURRENT_AS_FILEINFO;
  $flags |= FilesystemIterator::KEY_AS_FILENAME;

  $results = new RecursiveDirectoryIterator($dir, $flags);
  $flattened = new RecursiveIteratorIterator($results);
  $filtered = new RegexIterator($flattened, $mask);
  $files = array();
  foreach ($filtered as $filename => $file) {
    $file->uri = $file->getPathName();
    $file->filename = $file->getFileName();
    $file->name = pathinfo($file->filename, PATHINFO_FILENAME);
    $files[$file->name] = $file;
  }
};


$tests['SystemListing'] = function () {
  $mask = '/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info\.yml$/';
  $listing = new \Drupal\Core\SystemListing();
  return $listing->scan($mask, 'modules');

  $sysfiles['profile'] = $listing->scan($mask, 'profiles');
  $sysfiles['module'] = $listing->scan($mask, 'modules');
  $sysfiles['theme'] = $listing->scan($mask, 'themes');
};

$tests['ExtensionDiscovery'] = function () {
  $listing = new Drupal\Core\Extension\ExtensionDiscovery();
//  $listing->setProfileDirectories(array());
//  $profiles = $listing->scan('profile');
//  echo implode("\n", array_keys($profiles)), "\n\n";

  $listing->setProfileDirectories($dirs = array('core/profiles/standard'));

  $modules = $listing->scan('module', TRUE);
//  echo implode("\n", array_map(function ($file) { return $file->uri; }, $modules)), "\n\n";

//  $themes = $listing->scan('theme');
//  echo implode("\n", array_map(function ($file) { return $file->uri; }, $themes)), "\n\n";
};




/**
 * Test runner.
 */
foreach ($tests as $name => $test) {
  $start = microtime(true);
  for ($i = 0; $i < ITERATIONS; ++$i) {
    $tests[$name] = $test();
  }
  $stop = microtime(true);
  echo $name, ': ', round($stop - $start, 4), ' seconds', PHP_EOL;
}
#echo var_dump($tests), "\n";