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Bug #37577 Much Memory Usage while copy big files
Submitted: 2006-05-24 11:45 UTC Modified: 2006-05-24 23:15 UTC
From: petrich at tronic-media dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.1.4 OS: Linux + Windows
Private report: No CVE-ID: None
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From: petrich at tronic-media dot com
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 [2006-05-24 11:45 UTC] petrich at tronic-media dot com 
Description:
------------
Not sure if it's a "bug or a feature",
but when copying a  70MB file via PHP's copy() function,
the php process will use nearly the same Memory.

I found a (closed) Bug Report (#29922) relatet to this Issue (http://bugs.php.net/bug.php?id=29922),
it seems to be fixed long time ago, but in PHP 5.1.4 it is not.

Testet with PHP 5.1.4 (on Win-XP and Linux) as Apache2 Module. (All extentins disabled + default php.ini-dist settings) 

This Bug/Feature does'nt occur in php 4.3.3 (Win-XP as Apache2 Module).


Reproduce code:
---------------
<?php
copy('70MB.data','70MB.data.copy');
/* now look at the (linux) top listing for this Process to trace the growing memmory usage */ 
?>


Expected result:
----------------
Less Memory Usage in the top listing.

Actual result:
--------------
Much Memory Usage in the top listing.

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 [2006-05-24 23:15 UTC] iliaa@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

For faster copies php uses mmap() which maps the file to 
memory.
 
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