ID: 48643
User updated by: z...@php.net
Reported By: z...@php.net
Status: Open
Bug Type: SPL related
Operating System: Linux (Ubuntu)
PHP Version: 5.2CVS-2009-06-22 (CVS)
New Comment:
A checkout of PHP53 from the 25th June 2008 does *not* have the
problem
A checkout of PHP53 from the 26th June 2008 *does* have the problem
Previous Comments:
------------------------------------------------------------------------
[2009-06-23 14:13:37] robin_fernandes at uk dot ibm dot com
Testcase below shows that the issue relates to an implicit cast to
string on an SplFileInfo object when retrieved from a
RecursiveDirectoryIterator during iteration.
<?php
$rdi = new RecursiveDirectoryIterator('/manyFiles');
echo "SplFileInfo explicit cast to string: ";
foreach ($rdi as $v) { strlen((string)$v); } //OK
echo memory_get_usage(true) . PHP_EOL;
echo "SplFileInfo implicit cast to string: ";
foreach ($rdi as $v) { strlen($v); } //Leaky
echo memory_get_usage(true) . PHP_EOL;
?>
php52:
SplFileInfo explicit cast to string: 262144
SplFileInfo implicit cast to string: 262144
php53:
SplFileInfo explicit cast to string: 524288
SplFileInfo implicit cast to string: 6291456
------------------------------------------------------------------------
[2009-06-23 13:02:34] z...@php.net
Looking backwards through PHP builds I have currently narrowed this
down to a change that went in to PHP 5.3 somewhere between the 12th June
2008 and the 1st July 2008.
------------------------------------------------------------------------
[2009-06-23 12:13:49] robin_fernandes at uk dot ibm dot com
Below is a simplified testcase which I think exposes the same leak.
'/manyFiles' is a directory containing 10000 files.
<?php
$rii = new RecursiveIteratorIterator(
new RecursiveDirectoryIterator('/manyFiles')
);
function noop() {}
echo "noop call in loop (no leak) : ";
foreach ($rii as $v) { noop($v); }
echo memory_get_usage() . PHP_EOL;
echo "strlen call in loop (leak on 53) : ";
foreach ($rii as $v) { strlen($v); }
echo memory_get_usage() . PHP_EOL;
?>
Output on php52:
noop call in loop (no leak) : 66176
strlen call in loop (leak on 53) : 66176
Output on php53:
noop call in loop (no leak) : 337448
strlen call in loop (leak on 53) : 6028496
------------------------------------------------------------------------
[2009-06-22 14:33:05] z...@php.net
I tested with PHP 5.2 but do not see the same issue. I believe this is
specific to PHP 5.3.
------------------------------------------------------------------------
[2009-06-22 12:32:02] z...@php.net
By the way, I traced the memory consumption using xdebug:
xdebug.auto_trace = on;
xdebug.show_mem_delta = on;
The first few lines are here http://pastebin.ca/1469804
This makes it look more like a bug with the way the accept() method is
invoked inside PhptFilterIterator.
------------------------------------------------------------------------
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/48643
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