From: info at pion dot xs4all dot nl
Operating system: Linux
PHP version: Irrelevant
PHP Bug Type: *Directory/Filesystem functions
Bug description: Huge memory usage in file copy of big files
Description:
------------
If you copy a file of N megabytes (N in the order of a few
hundred megs) your proces will use the same order of ammount
of memory (or less if the system doesn't have that much).
This is probably because the file is compleetly memory mapped
and than the content is written to an other file.
Probably it will be better to use the behavior of the unix
"cp" command which reads 4k and than writes the 4k.
In this way "cp" is almost a factor two faster than php
and has less impact on the system performance.
Reproduce code:
---------------
<?php
#
# This assumes that there excist a big
# file "/tmp/file_512m" which has 512mb
# of data and that there is enough space
# in "/tmp".
#
copy ("/tmp/file_512m", "/tmp/target")
?>
Expected result:
----------------
The unix "cp" needed 1 minut 8 seconds to copy
the file and php used 2 and 18 seconds on my desktop
system with 512mb.
Actual result:
--------------
They should be in the same order
--
Edit bug report at http://bugs.php.net/?id=29922&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=29922&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=29922&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=29922&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=29922&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=29922&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=29922&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=29922&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=29922&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=29922&r=support
Expected behavior: http://bugs.php.net/fix.php?id=29922&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=29922&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=29922&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=29922&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=29922&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=29922&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=29922&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=29922&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=29922&r=float
