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Date: Wed, 16 Jul 2008 23:55:35 -0700
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To: Arvids Godjuks <arvids.godjuks@gmail.com>
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Subject: Re: [PHP-DEV] lstat call on each directory level
From: rasmus@lerdorf.com (Rasmus Lerdorf)

Arvids Godjuks wrote:
> Yesterday I made some tests on my site with strace to see how much lstat
> I have and how can I optimize them. Well, I managed to get rid of them
> almost at all, but now I have some questions about include_path and
> including files based on current dir.
>
> I have such structire of files
>
> /home/file/www (that's my site root dir)
>
> include/
> - bittorrent
> - global.php
>
> lang/
> - eng.lang
> - rus.lang
>
> index.php
>
>
> My files are
> ---- index.php ---
> require './include/bittorrent.php';
>
> --- common.php ---
> require './include/global.php';
> require './lang/eng.lang';
> And some other files from include dir
>
> Default include path is ".:/usr/share/php5:/usr/share/php" and if I
> don't change it it results in a bunch of lstat. Here is the trace
> http://pastebin.com/m37704b6a
>
> The thing I don't understand from trace is WHY it tests include path
> BEFORE the ./ ? Why it doesn't try to load file based on relative path
> first (it should hit it on first try) and then use include path?
> Ok, I make in bittorrent.php - set_include_path('/home/file/www');
>
> The only lstat i have now is
>
> lstat("/home", {st_mode=S_IFDIR|0755, st_size=144, ...}) = 0
> lstat("/home/file", {st_mode=S_IFDIR|0755, st_size=1112, ...}) = 0
> lstat("/home/file/www", {st_mode=S_IFDIR|0755, st_size=11880, ...}) = 0
> lstat("/home/file/www/bittorrent.php", 0x7fff8d95cca0) = -1 ENOENT (No
> such file or directory)
> open("/home/file/www/bittorrent.php", O_RDONLY) = -1 ENOENT (No such
> file or directory)
> open("/home/file/www/include/bittorrent.php", O_RDONLY) = 14
>
> So the question is - why are they happen at all, if I include
> bittorrent.php as require './include/bittorrent.php' in index.php. As i
> understand it should hit the right folder from first time. Could you,
> please, explain how all this works, because as it turned out it is not
> so obvious as it should be...
>
> I have PHP 5.2.6 (Gentoo Linux package name is dev-php5/php-5.2.6-r2)
> and lighttpd 1.5

You missed something.  You have an include 'bittorrent.php' in there 
somewhere.  This thread would really be more appropriate on php-users at 
this point.

-Rasmus