Bug #77209 [Fbk->NoF]: Leaks memory
| From: | php-bugs at lists dot php dot net | Date: | Sun, 09 Dec 2018 04:22:04 +0000 |
| Subject: | Bug #77209 [Fbk->NoF]: Leaks memory | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-218349@lists.php.net to get a copy of this message | ||
Edit report at https://bugs.php.net/bug.php?id=77209&edit=1
ID: 77209
Updated by: php-bugs@lists.php.net
Reported by: silicid at gmail dot com
Summary: Leaks memory
-Status: Feedback
+Status: No Feedback
Type: Bug
Package: Performance problem
Operating System: Debian 8
PHP Version: 7.2.12
Private report: N
New Comment:
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
Previous Comments:
------------------------------------------------------------------------
[2018-11-27 14:05:04] silicid at gmailc dot om
It depends on the number of objects created.
The output for me is:
int(37336)
int(3733600)
int(0)
int(3808384)
int(3733600)
int(0)
int(7579320)
int(3733600)
int(0)
int(11350256)
int(3733600)
int(0)
int(15121192)
int(3733600)
int(0)
int(18892128)
int(3733600)
int(0)
int(22663064)
int(3733600)
int(0)
int(26434000)
int(3733600)
int(0)
int(30204936)
int(3733600)
int(0)
int(33975872)
int(3733600)
int(0)...
------------------------------------------------------------------------
[2018-11-27 13:39:35] danack@php.net
please could you check again, with code like the below as I don't think the garbage collection
kicks in immediately every single time, and also if it is actually a memory leak, the memory usage
should continue to go up, rather than just be slightly higher for a moment.
The output of the script below for me is:
int(0)
int(0)
int(32)
int(0)
int(0)
int(32)
int(0)
int(0)
int(32)...
https://3v4l.org/dPZ2R
class Test {
public function __construct() {
for ($i = 0; $i < 1000; ++$i) {
$this->result[] = rand(1, 1000);
}
}
function object() {
is_object($this);
}
}
function checkMemory($memoryAtStart)
{
for ($i = 0; $i < 1; ++$i) {
$object = new Test();
$object->object();
unset($object);
}
var_dump(memory_get_usage() - $memoryAtStart);
$memoryAtStart = memory_get_usage();
for ($i = 0; $i < 100; ++$i) {
$object = new Test();
$object->object();
unset($object);
}
var_dump(memory_get_usage() - $memoryAtStart);
$memoryAtStart = memory_get_usage();
for ($i = 0; $i < 100; ++$i) {
$object = new Test();
is_object($object);
unset($object);
}
var_dump(memory_get_usage() - $memoryAtStart);
}
$memoryAtStart = null;
for ($x=0; $x<100; $x++) {
if ($memoryAtStart === null) {
$memoryAtStart = memory_get_usage();
}
checkMemory($memoryAtStart);
gc_collect_cycles();
}
------------------------------------------------------------------------
[2018-11-27 13:20:12] silicid at gmailc dot om
PHP Version 7.2.12-1+0~20181112102353.11+jessie~1.gbp55f215
System Linux VV10015-z2174 4.15.17-3-pve #1 SMP PVE 4.15.17-13 (Mon, 18 Jun 2018 17:15:04 +0200)
x86_64
Build Date Nov 12 2018 13:46:27
------------------------------------------------------------------------
[2018-11-27 12:09:57] silicid at gmail dot com
Description:
------------
You must create a file with the specified code.
If you execute method "is_object" from "$this" and unset the object, then leaks
memory. But if you call method "is_object" for "$object", then there are no
problems.
In version 7.1 there are no problems. There are no problems in Windows.
Test script:
---------------
<?php
class Test {
public function __construct() {
for ($i = 0; $i < 1000; ++$i) {
$this->result[] = rand(1, 1000);
}
}
function object() {
is_object($this);
}
}
$memory = memory_get_usage();
for ($i = 0; $i < 1; ++$i) {
$object = new Test();
$object->object();
unset($object);
}
var_dump(memory_get_usage() - $memory);
$memory = memory_get_usage();
for ($i = 0; $i < 100; ++$i) {
$object = new Test();
$object->object();
unset($object);
}
var_dump(memory_get_usage() - $memory);
$memory = memory_get_usage();
for ($i = 0; $i < 100; ++$i) {
$object = new Test();
is_object($object);
unset($object);
}
var_dump(memory_get_usage() - $memory);
Expected result:
----------------
int(0)
int(0)
int(0)
Actual result:
--------------
int(37336)
int(3733600)
int(0)
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=77209&edit=1