Bug->Req #53031 [Bgs]: GC does not collect before PHP issue "Allowed memory size exhausted"
| From: | an0nym at narod dot ru | Date: | Sat, 09 Oct 2010 16:20:45 +0000 |
| Subject: | Bug->Req #53031 [Bgs]: GC does not collect before PHP issue "Allowed memory size exhausted" | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-155050@lists.php.net to get a copy of this message | ||
Edit report at http://bugs.php.net/bug.php?id=53031&edit=1
ID: 53031
User updated by: an0nym at narod dot ru
Reported by: an0nym at narod dot ru
Summary: GC does not collect before PHP issue "Allowed memory
size exhausted"
Status: Bogus
-Type: Bug
+Type: Feature/Change Request
Package: *General Issues
Operating System: Windows Server 2008 R2 x64
PHP Version: 5.3.3
Block user comment: N
New Comment:
PHP can reuse memory, but doesn't do this. If this isn't a bug (that I'm
not agree with), then this is surely a feature request.
Previous Comments:
------------------------------------------------------------------------
[2010-10-09 18:02:19] johannes@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
Check the documentation which describes when cycles are collected:
http://de3.php.net/manual/en/features.gc.collecting-cycles.php
This
won't change.
------------------------------------------------------------------------
[2010-10-09 16:50:04] an0nym at narod dot ru
Description:
------------
GC does not collect cycles before PHP issue "Allowed memory size
exhausted",
therefore it is possible for a script to get this error even if GC is
enabled and
there is enough memory to reuse.
To get error the script just has to fill all the remaining memory after
last GC
and before next, fill no matter how: with garbage or normal info.
It is obvious for me, that calling GC before issuing error is a must
have, as a
last possibility to continue normal execution.
Test script:
---------------
<?php
set_time_limit(0);
error_reporting(PHP_INT_MAX);
ini_set("memory_limit", "2M");
echo memory_get_peak_usage(true), "\r\n";
$o1 = new StdClass();
$o2 = new StdClass();
$o1->v1 = $o2;
$o1->v2 = $o1;
$o1->v = str_repeat("a", 1024 * 1024);
unset($o1, $o2);
echo memory_get_peak_usage(true), "\r\n";
$o1 = new StdClass();
$o2 = new StdClass();
$o1->v1 = $o2;
$o1->v2 = $o1;
$o1->v = str_repeat("a", 1024 * 1024);
unset($o1, $o2);
echo memory_get_peak_usage(true), "\r\n";
Expected result:
----------------
I expect to see the same result as if I run
<?php
...
echo memory_get_peak_usage(true), "\r\n";
$o1 = new StdClass();
$o2 = new StdClass();
$o1->v1 = $o2;
$o1->v2 = $o1;
gc_collect_cycles();
$o1->v = str_repeat("a", 1024 * 1024);
unset($o1, $o2);
echo memory_get_peak_usage(true), "\r\n";
Actual result:
--------------
PHP Fatal error: Allowed memory size of * bytes exhausted (tried to
allocate *
bytes)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/bug.php?id=53031&edit=1