ID: 10701
Updated by: sas
Old-Status: Open
Status: Closed
Bug Type: Filesystem function related
Operating system: 
PHP Version: 4.0.5
Assigned To: 

It is almost impossible to tell from the output of system commands like top why 
certain processes have such a huge memory footprint and what kind of memory they are 
associated with.

In this case, you get the impression that the processes use much memory, because PHP 
maps files into the web-server's address space and sends them out in one quick move. 
These maps do not cause swapping though, as they can be removed  from physical RAM 
without any swapping.

Your problem is probably caused by using Apache for serving large static files. Every 
download ties up one Apache instance and hence the available RAM limits the number of 
users you can serve. Switching the file-server to e.g. thttpd would free up 
significant resources (RAM and CPU time).

Previous Comments:

[2001-05-18 11:10:47] [EMAIL PROTECTED]
Reopened. This is not fixed.



[2001-05-18 00:51:27] [EMAIL PROTECTED]
You are kidding right? Nice way to take down a server.

load average: 66.52, 33.25, 15.76

$fp = fopen("/web/sites/contentsite/".$f);
       echo fgets($fd, 4096);


[2001-05-18 00:28:19] [EMAIL PROTECTED]
What's to claim.  This is a support question that belongs on one of the mailing lists 
and not in the bug database.

But a hint.  Don't use readfile(), fopen() the file and read it a bit at a time 
instead of sticking the entire thing in memory.


[2001-05-17 17:29:33] [EMAIL PROTECTED]
Anyone plan on claiming this?


[2001-05-07 07:34:13] [EMAIL PROTECTED]
Ok, this is a pretty intersting one, and I'm not even sure if it's a bug or just a 
memory limit thing. I am using a php wrapper for content files 
(.jpg|.gif|.asf|.mov|.ram), as you can guess, the movie files can be pretty large, 
upwards of 10MB, all getting read into memory, then spit back out. Couple that with a 
site that gets 10K+ visits a day and the server is on its knees with a load average of 
about 10 (when it gets to 25/30 things start swapping and it will dies not long after 

here's the code used to wrap the content:

$mime_type = strtolower(strrchr($f,'.'));
$mime_type_array = array(
        '.asf' => 'application/',
        '.jpg' => 'image/jpeg',
        '.gif' => 'image/gif'

        header("Location: /error.php");

$offset = 86400 * 3;
header("Expires: ".gmdate("D, d M Y H:i:s GMT", time() + $offset));
header("Cache-Control: max-age=".$offset.", must-revalidate");
header("Last-modified : ".gmdate("D, d M Y H:i:s GMT", 
header("Content-type: ".$mime_type_array[$mime_type]);
header("Content-length: ".filesize("/web/sites/contentsite/".$f));

so, I would pass an image or movie to the content file with a url like so:

This is really just a heads up at this point, I know it will take you guys a little 
while to sort through this one, I'm not even sure it's a bug considering readfile is 
SUPPOSED to read a file into memory and spit it back out. I dunno, for now I'm going 
to do some .htaccess tricks where I force php to parse .htaccess files. If anyone has 
come across this or has any insight on wrapping content in php files, please email me 

Stephen VanDyke

PS - aside from that, great language, I love PHP :)


The remainder of the comments for this report are too long.  To view the rest of the 
comments, please view the bug report online.

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