Newsgroups: php.internals Path: news.php.net Xref: news.php.net php.internals:22357 Return-Path: Mailing-List: contact internals-help@lists.php.net; run by ezmlm Delivered-To: mailing list internals@lists.php.net Received: (qmail 51228 invoked by uid 1010); 13 Mar 2006 04:34:13 -0000 Delivered-To: ezmlm-scan-internals@lists.php.net Delivered-To: ezmlm-internals@lists.php.net Received: (qmail 51212 invoked from network); 13 Mar 2006 04:34:13 -0000 Received: from unknown (HELO lists.php.net) (127.0.0.1) by localhost with SMTP; 13 Mar 2006 04:34:13 -0000 X-Host-Fingerprint: 204.11.219.139 lerdorf.com Linux 2.4/2.6 Received: from ([204.11.219.139:55346] helo=colo.lerdorf.com) by pb1.pair.com (ecelerity 2.0 beta r(6323M)) with SMTP id 0C/67-55982-446F4144 for ; Sun, 12 Mar 2006 23:34:12 -0500 Received: from [192.168.200.106] (c-24-6-5-134.hsd1.ca.comcast.net [24.6.5.134]) (authenticated bits=0) by colo.lerdorf.com (8.13.5/8.13.5/Debian-3) with ESMTP id k2D4Y7jH009412 for ; Sun, 12 Mar 2006 20:34:08 -0800 Message-ID: <4414F63F.5030406@lerdorf.com> Date: Sun, 12 Mar 2006 20:34:07 -0800 User-Agent: Thunderbird 1.5 (Macintosh/20051201) MIME-Version: 1.0 To: internals Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Calling performance geeks From: rasmus@lerdorf.com (Rasmus Lerdorf) We have a bit of a performance disconnect between 4.4 and 5.1 still. I was doing some benchmarking today just as a sanity check on some APC work I have been doing lately and came up with this: http://lerdorf.com/php/bm.html You can ignore the apc/eaccelerator stuff. Those numbers are not surprising. The surprising number to me is how much faster 4.4 still is. The graph labels are slightly off. The 0, 5 and 10 includes should really be 1, 6 and 11. The actual benchmark code is here: http://www.php.net/~rasmus/bm.tar.gz Tested on a Linux 2.6 Ubuntu box on an AMD chip (syscalls are cheap there) with current PHP_4_4 and PHP_5_1 checkouts. Was also testing 5.1.2 to see the effect of getting rid of that uncached realpath call. As far as I can tell auto_globals_jit isn't working at all, but I eliminated that by doing variables_order = GP for these benchmarks. Even so, the request_startup is significantly more expensive in 5.1. Here are callgrind dumps for each. Load them up with kcachegrind and browse around: PHP 4.4 http://www.php.net/~rasmus/callgrind.out.1528.gz PHP 5.1 http://www.php.net/~rasmus/callgrind.out.1488.gz Each of these is 1000 requests against the top.php and 4top.php scripts. from bm.tar.gz. If you start at the The script is trivial and looks like this: prop = $arg; } function getProp() { return $this->prop; } function setProp($arg) { $this->prop = strtolower($arg); } } top_func('foo'); $a = new top_class('bar'); echo $a->getProp(); $a->setProp("AbCdEfG"); echo $a->getProp(); echo << and config.inc is: 'mysql', 'db_user' => 'www', 'db_pwd' => 'foobar', 'config1' => 123, 'config2' => 456, 'config3' => 789, 'sub1' => array(1,2,3,4,5,6,7,8,9,10), 'sub2' => array("abc","def","ghi","jkl","mno","pqr","stu","vwx","yz") ); ?> 4top.php is identical except for the class definition being PHP 4-style instead. As in no private and a PHP 4 constructor. Otherwise it is identical. I have some ideas for things we can speed up in 5.1. Like, for example, we should add the ap_add_common_vars() and ap_add_cgi_vars() to the jit mechanism. There isn't much point filling these in unless the script tries to get them. the ap_add_common_vars() call is extremely expensive since it does a qsort with a comparison function that uses strcasecmp. Of course, this same optimization can be done in 4.4. If you know your way around kcachegrind, load up the two callgrind files and see what stands out for you. As far as I can tell, while we can do some tricks to speed up various helper bits, the slowdown is coming from the executor trashing its cache lines. -Rasmus