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Bug #50571 Performance Mysqli in php 5.3.1 signific slower than 5.2.6
Submitted: 2009-12-24 23:01 UTC Modified: 2010-01-09 19:19 UTC
From: millennium at qme dot nl Assigned:
Status: Not a bug Package: MySQLi related
PHP Version: 5.3.1 OS: Windows Server 2003
Private report: No CVE-ID: None
View Developer Edit
 [2009-12-24 23:01 UTC] millennium at qme dot nl 
Description:
------------
The performance of Mysqli in php5.3.1(mysqlnd) is signific slower than 
the performance in php 5.2.6. (I know it's not the best code, but it's 
in production, and I would expect 5.3.1 is as fast as 5.2.6 or faster.

Reproduce code:
---------------
<?php
  $SERVER = "127.0.0.1";
  $USERNAME = "";
  $PASSWORD = "";
  $DATABASENAME = "";
  
  $high = 2000;
  $start = microtime(TRUE);
	for($i = 0; $i <$high; $i++)
	{
    $mysql = mysqli_connect($SERVER,$USERNAME,$PASSWORD,$DATABASENAME);
    mysqli_query($mysql, "UPDATE test SET title = '" . mysqli_real_escape_string($mysql,"test") . "' WHERE test_id = " . null);
    mysqli_close($mysql);
  }
  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:
----------------
time: 1.83 secs, memory usage 0.15 MiB. (php 5.2.6)

Actual result:
--------------
time: 29.82 secs, memory usage 0.40 MiB

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 [2009-12-24 23:19 UTC] jani@php.net 
Please try using this snapshot:

  http://snaps.php.net/php5.3-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/
 [2009-12-24 23:26 UTC] millennium at qme dot nl 
C:\php2>php sync.php
time: 28.37 secs, memory usage 0.40 MiB.

C:\php2>php -v
PHP 5.3.2-dev (cli) (built: Dec 22 2009 09:57:39)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2009 Zend Technologies
 [2009-12-25 00:25 UTC] scottmac@php.net 
Can you adjust your test to see if its the connection, the query or the closing that's causing the problems?
 [2009-12-25 00:39 UTC] millennium at qme dot nl 
If I move the connect and disconnect outside the loop, the speed is 
the (almost) the same.

php 5.2.6:
time: 0.27 secs, memory usage 0.15 MiB.
php 5.3.1:
time: 0.28 secs, memory usage 0.40 MiB.

moving the connect inside the loop again (keeping the disconnect 
outside)

php5.2.6:
time: 1.82 secs, memory usage 0.15 MiB.
php5.3.1:
time: 31.11 secs, memory usage 0.40 MiB.

So I guess it's the connect.
 [2009-12-25 00:41 UTC] pajoye@php.net 
That's expected as mysqlnd uses php's stream. That brings a small overhead over raw sockets.
 [2010-01-09 19:19 UTC] jani@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
 
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