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Message-ID: <7cea347c0704240223s5623ddb3yb8d2003d8c417370@mail.gmail.com>
Date: Tue, 24 Apr 2007 11:23:29 +0200
To: "internals@lists.php.net" <internals@lists.php.net>
In-Reply-To: <op.tq96a21tps3mh7@dominus.blog.de>
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References: <op.tq96a21tps3mh7@dominus.blog.de>
Subject: Re: [PHP-DEV] require_once
From: david.sklar@gmail.com ("David Sklar")

require_once verifies (via stat()) each path component in the path
being loaded so that it can canonicalize it to check it against the
canonicalized list of already-required files.

Run your script below under strace and you will see all of those stats
gumming up the works.

Note also that if you want maximum performance here, pass full paths,
not relative paths, to include/require to avoid any include_path
overhead.

David

On 4/24/07, dletz@blog.de <dletz@blog.de> wrote:
> Hello everyone,
>
> when testing speed of includes and requires i found that "require_once"
> seems to be very slow in comparison to "require". Even worse
> "require_once" seems to be slower than a php function "myrequire_once".
> This is true not only for cli but also when using apc or eAccelerator.
> Does anyone has an explanation for this?
>
> Testcode:
> <?
> $start_time = microtime(true);
>
> function myrequire_once($file)
> {
>      static $loaded = array();
>      if (!array_key_exists($file, $loaded))
>      {
>          $loaded[$file] = 1;
>          require $file;
>      }
> }
>
> for ($i=0;$i<1000;$i++) {
>      require_once('manyClasses/'.$i.'.class.php');
>      //myrequire_once('manyClasses/'.$i.'.class.php');
> }
>
> $execution_time = microtime(true) - $start_time;
> echo number_format($execution_time,4)."\n";
> ?>
>
> I first generated the classes in manyClasses with this generation code
> (you have to create the directory manyClasses first):
>
> <?
> $template = '<?
> class A%s
> {
>      private $B%s = "%s";
>      function C%s($arg1, $arg2)
>      {
>          if (rand() > 1000)
>              return $arg1 + $arg2;
>          else
>              return 0;
>      }
> };
> ?>';
>
> for($i=0; $i< 1000; $i++)
> {
>      $rand = rand();
>      $file = sprintf($template, md5($rand), md5($rand+1), md5($rand+2),
> md5($rand+3));
>      file_put_contents('manyClasses/'.$i.'.class.php', $file);
> }
> ?>
>
>
> Faithfully
> Dominic Letz
>
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