From: rlillack at yasni dot de
Operating system: Ubuntu jaunty x86_64
PHP version: 5.3.1
PHP Bug Type: Performance problem
Bug description: performance regression handling objects, ten times slower in
5.3.x
Description:
------------
PHP 5.3 did indeed introduce many performance improvements, but we
spotted a rather hard regression with handling a large amount of
objects that are allocated at the same time.
Running the following test case on one of our web servers yield this
result with a vanilla build of 5.2.11:
time: 1.28 secs, memory usage 376.48 MiB.
and this with 5.3.1:
time: 13.44 secs, memory usage 400.62 MiB.
(command line in both cases: PREFIX/bin/php -d memory_limit=2G
testcase.php)
The regression at least since the PHP 5.3 release candidates.
Both were fresh build straight from the tarball, No extensions, etc.
Opcode caches do not help. --with-zend-vm does not help.
Reproduce code:
---------------
<?php
$start = microtime(TRUE);
$a = array();
foreach (range(1, 1000000) as $i) {
$a []= new StdClass;
}
printf("time: %s secs, memory usage %s MiB.\n",
number_format(microtime(TRUE) - $start, 2),
number_format(memory_get_usage() / 1024 / 1024, 2));
Expected result:
----------------
PHP 5.3.1 should not be any slower than 5.2.11 is. :)
Actual result:
--------------
PHP 5.3.1 is ten times slower in this test case.
One of our apps does only handle 1/4th queries/s with 5.3 on a
production server.
--
Edit bug report at http://bugs.php.net/?id=50351&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=50351&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=50351&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=50351&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=50351&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=50351&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=50351&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=50351&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=50351&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=50351&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=50351&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=50351&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=50351&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=50351&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=50351&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=50351&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=50351&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=50351&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=50351&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=50351&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=50351&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=50351&r=mysqlcfg
