ID: 22055
Comment by: medge at neverathome dot net
Reported By: jparneodo at yahoo dot fr
Status: No Feedback
Bug Type: Scripting Engine problem
Operating System: RedHat 7.2
PHP Version: 4.3.1-dev
New Comment:
This problem still exists - this is causing us extreme headaches as we
will need to have two object models in our system.
One which is useful, and one which is "in case we have to do anything
with high load in PHP" and isn't an object model at all.
This seems like a pretty critical bug.
Previous Comments:
------------------------------------------------------------------------
[2009-04-01 13:45:54] phpuser at gmail dot com
Having the same issue with php 5.2.9.
As stated above, this is a major problem, as I'm using php to
import/export data between databases, and I'm talking about millions
rows.
I have to split the data to import, because even after using unset()
the memory used by objects isn't released.
Please do something about this bug. It has been reported 6 years ago
and is still here !!
Tested with php 5.2.6 and 5.2.9, both with linux and windows xp.
------------------------------------------------------------------------
[2007-03-01 03:51:12] matthieu dot aubry at gmail dot com
I also have the same problem using
PHP Version => 5.1.2
Build Date => Nov 2 2006 12:28:13
Server API => Command Line Interface
This bug is really annoying.
I'm working on a project which loads thousands of files parsed into
objects.
I use the technic
$this->myObjectMember->register($this);
which creates cross references.
Calling unset() doesn't change anything, as seen in the examples
provided above.
I would love to see this bug fixed! Thank you.
------------------------------------------------------------------------
[2005-06-17 16:25:54] apinstein at mac dot com
I have experienced this problem on PHP5 as well... here's a
test script:
echo memory_get_usage() . " (initial)\n";
$t = new test;
echo memory_get_usage() . " (after: \$t = new test();)\n";
unset($t);
echo memory_get_usage() . " (after: unset(\$t);)\n";
echo "done\n";
class test
{
protected $str;
protected $t2;
function __construct()
{
print "construct test\n";
$this->str = str_repeat('1234567890', 1000);
$this->t2 = new test2($this);
}
function __destruct()
{
print "destruct test\n";
}
}
class test2
{
protected $str;
protected $t1;
function __construct($t1)
{
print "construct test2\n";
$this->str = str_repeat('1234567890', 1000);
$this->t1 = $t1;
}
function __destruct()
{
print "destruct test2\n";
unset($this->str);
}
}
And the output of this script:
51416 (initial)
construct test
construct test2
72000 (after: $t = new test();)
72000 (after: unset($t);)
done
destruct test
destruct test2
It's definitely a real problem. Simply removing the cross-
referenced instance vars will remove the problem. However,
as you can see, even explicitly calling unset() still
doesn't release the objects or call destructors until the
script EXITS.
This is a *MAJOR* problem for anyone using OO to process
large amounts of information.
------------------------------------------------------------------------
[2004-03-01 05:07:55] tom at scl dot co dot uk
Is anyone looking into this?
I've found any method of releasing the objects fails, no just using the
unset() function, if the object just go out of scope they aren't
released, for ezample, if you do something like
function MyFunc() {
$x = new C;
$y = new C;
$x->ref =& $y;
$y->ref =& $x;
}
Then after the function has finished then the memory allocated for the
local variables $x and $y is not freed up.
------------------------------------------------------------------------
[2004-02-23 11:21:41] tom at scl dot co dot uk
I had this problem with PHP4.3.3. I then found this bug report and
upgraded to PHP5.0.0b4 to try and fix this problem and I still get the
memory leak problem, there is some demo code below, you need to change
/path/to/large/file. I've been using a file which is about 1.5mb and
when PHP is set to stop when it reaches 8mb then it only makes it
through the loop twice.
I'm 1.5 years into a project and I could really do with knowing if this
is going to be fixed anytime soon so I can either wait for the fix or
try and find a work around. Thanks for your time,
Tom
---
<?php
class C {
var $ref;
var $val;
function C() {
$this->val = file('/path/to/large/file');
}
}
while (1) {
$x = new C;
$y = new C;
$x->ref =& $y;
$y->ref =& $x;
unset($y);
unset($x);
echo ".";
}
?>
------------------------------------------------------------------------
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/22055
--
Edit this bug report at http://bugs.php.net/?id=22055&edit=1
