ID: 31332
Updated by: [EMAIL PROTECTED]
Reported By: marekm at apnet dot pl
Status: Verified
Bug Type: Performance problem
Operating System: *
PHP Version: 4CVS, 5CVS (2005-01-04)
New Comment:
Sorry to say... but abusing serialize for this is not a good idea in
the first place. It's not meant for storing data in this way in the
first place. But of course the slowdown shouldn't have been this much.
Previous Comments:
------------------------------------------------------------------------
[2005-01-13 21:11:06] gik at zap dot cl
The excessively high load average of a server recently updated to php
4.3.10 was driving me nuts. This bug is critical for many php based
systems as drupal, vBulletin and others.
Gik.
------------------------------------------------------------------------
[2005-01-10 13:43:52] kier at vbulletin dot com
I can confirm this problem from my experience with 4.3.10 and 5.0.3.
Unserialize() under the latest versions appears to be massively slower
than was previously so.
We have had wide reports of vBulletin installations running
significantly slower since we recommended that customers upgrade to
4.3.10 / 5.0.3.
Hoping for a quick resolution to this problem, as it affects so many
people so drastically.
------------------------------------------------------------------------
[2005-01-09 15:11:39] ralf dot praschak at gmx dot net
i use vbulletin 3.0.5. the forumcache is also unserialized.
i tracked this with the nusphere profiler.
with php 4.3.9 (or 5.0.2) it takes around 300ms.
with php 4.3.10 (or 5.0.3) it takes 17s and more !!!
the cache is around 2.5 megs big ;(
------------------------------------------------------------------------
[2004-12-30 10:13:09] chris-php at bolt dot cx
Pretty sure we're getting hit by this as well. We use serialize a lot
(memcached), and upgrading from PHP 4.3.9 to 4.3.10 tripled our
servers' load averages.
------------------------------------------------------------------------
[2004-12-29 12:30:09] marekm at apnet dot pl
Description:
------------
I keep big multidimensional arrays serialize()'d into strings in
database.
After upgrade from 4.3.9 -> 4.3.10 I noticed, that unserialize()
function on some of them work even 20 times slower. On other the
slowdown is minimal.
Reproduce code:
---------------
<?
function getmicrotime()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$f=fopen("serialized.txt","r");
$l1=fgets($f,1000000);
fclose($f);
$t1=getmicrotime();
$a=unserialize($l1);
echo(getmicrotime()-$t1);
?>
The tested "serialized.txt" file can be downloaded from
http://ap.aptus.pl/serialized.txt
Expected result:
----------------
The above script working as fast as in 4.3.9
Actual result:
--------------
The script works about 20x slower.
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=31332&edit=1
