Profiling PHP & Javascript

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org PHP & Javascript Profiling Dave Ross The West Suburban Chicago PHP Meetup March 5, 2009

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Dave Ross “ I grew up around computers, fell in love with the Internet way back in 1994, and built a successful career around my interests in computers and business. My career focus has been on e-commerce, and in my personal time I study issues related to digital identity, trust, and reputation tracking. I’m also a cat shelter volunteer, a small business owner, an avid Scrabble player, a vintage computer enthusiast, and a b-movie junkie.” Ten years professional development experience. PHP Developer, certified Java developer LinkedIn Profile: http://www.linkedin.com/in/daverossfromchicago

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Software Profiling In software engineering, performance analysis, more commonly today known as profiling, is the investigation of a program's behavior using information gathered as the program executes (i.e. it is a form of dynamic program analysis, as opposed to static code analysis). The usual goal of performance analysis is to determine which sections of a program to optimize — usually either to increase its speed or decrease its memory requirement (or sometimes both). - Wikipedia

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Webgrind Output

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org PHP Options For Profiling

DBG (http://www.php-debugger.com/dbg/)
Xdebug (http://www.xdebug.org/)

Xdebug is free (as in beer and speech), actively maintained, and well-supported. I highly recommend it.

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Installing Xdebug Put xdebug.so somewhere on your system Add something like this to php.ini: ; xdebug config Mac OS X   zend_extension=/Applications/MAMP/Library/share/php/xdebug.so  xdebug.remote_enable=1  xdebug.remote_handler=dbgp xdebug.remote_mode=req  xdebug.remote_host=127.0.0.1   xdebug.remote_port=9000  xdebug.idekey= xdebug.profiler_enable =1 xdebug.profiler_output_dir=/Applications/MAMP/logs/xdebug ...and then restart Apache (you might have disable Zend Optimizer too)

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Success? Your phpinfo() should look a little like this:

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org And you'll start getting these cachegrind.out.##### files left in your xdebug.profiler_output_dir every time you load a PHP page...

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org What does it mean? You don't need to know. This guy needs to know (Derick Rethans, father of Xdebug)

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org You need a “callgrind” program

Wingrind (Windows)
KcacheGrind (Linux/KDE)
MacCallGrind (Mac/OSX)
Webgrind (browser)

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org “ Cost” When *grind refers to a function call's “cost”, it's measuring the assembly language instructions for that call. This is mostly meaningless to us in a high-level language. What's important is the relative cost. If some function call is “costing” a lot more than other calls, and it doesn't do a whole lot, that's where you need to optimize.

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Now, let's profile some Javascript! Download Firebug for Firefox @ http://getfirebug.com/ Why aren't you using it already?

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org console.profile() turns on the profiler console.profileEnd() turns it off

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Firebug Profiling

PHP & Javascript Profiling :: Dave Ross :: The West Suburban Chicago PHP Meetup :: March 2009 :: suburbanchicagophp.org Links