loading i10n messages from opcache vs apc

apcu_vs_opcache.php

<?php
// apcu vs. opcache benchmark
// loads mediawiki en messages from cache 1000 times
// you need languages/i18n/en.json in the same directory as this script.
//
// ini settings you need:
//   zend_extension=opcache.so
//   opcache.enable=1
//   opcache.enable_cli=1
//   extension=apcu.so
//   apc.enabled = 1
//   apc.enable_cli = 1

if ($argc !== 2 || ($argv[1] !== "apcu" && $argv[1] !== "opcache")) {
  die("Usage: " . __FILE__ . " [apcu|opcache]\n");
}

// opcache: check file mtime *every time*. set this to a positive value to
// check script modifications every n seconds.
// To count stat() calls:
//   $ strace -e trace=%stat php apcu_vs_opcache.php opcache 2>&1 | grep -c stat
ini_set("opcache.revalidate_freq", 0) || die("ini_set()\n");

if (!file_exists('en.php')) {
  $arr = json_decode(file_get_contents('en.json'), true);
  file_put_contents("en.php", "<?php\nreturn " . var_export($arr, true) . ";\n") || die();
}

// Warm up the caches
opcache_compile_file('en.php') || die("opcache_compile_file()\n");
$value = include('en.php');
apcu_store('en', $value);
opcache_is_script_cached('en.php') || die("opcache_is_script_cached()\n");
apcu_exists('en') || die("apcu_exists()\n");

$n = 1000;
$dummy = 0;

if ($argv[1] === "opcache") {
  echo "opcache\n";
  $start = microtime(true);
  for ($i = 0; $i < $n; $i++) {
    $arr = include('en.php');
    $dummy += is_array($arr);
  }
  $end = microtime(true);
} else {
  echo "apcu\n";
  $mtime = filemtime('en.php');
  $start = microtime(true);
  for ($i = 0; $i < $n; $i++) {
    $arr = apcu_fetch('en');
    $dummy += is_array($arr);
    clearstatcache();  // don't cache mtimes
    if (filemtime('en.php') != $mtime) die("en.php mtime changed\n");
  }
  $end = microtime(true);
}
printf("%s: %.2fms\n", $argv[1], (($end-$start)*1000));
if ($dummy !== $n) die("error");