Practical Performance Profiling

Andrey “Rarst” Savchenko

• Rarst.net
• WPSE ( s.tk/wp )
• QueryPosts.com
• Composer.Rarst.net

Internet is lying to you

1. Enable profiler extension…
2. Load the page to profile…
3. Find the resulting profile file…
4. Launch the profile viewer application…
5. Load the profile file in viewer application…

Bullshit.

Low setup, low detail

• easy to install
• minimal requirements
• primarily totals information

var_dump() of profiling

printf(
	'%d queries in %.3f seconds, using %.2fMB memory',
	get_num_queries(),
	timer_stop( 0, 3 ),
	memory_get_peak_usage() / 1024 / 1024
);
// 3 queries in 0.251 seconds, using 4.42MB memory

Symfony Stopwatch

$stopwatch = new Stopwatch();
$stopwatch->start( 'eventName' );
// some code goes here
$event = $stopwatch->stop( 'eventName' );
echo $event->getDuration(); // 202
echo $event->getmemory(); // 3670016

High setup, high detail

• (relatively) hard to install
• require PHP binary extension
• highly detailed information

XHProf / uprofiler

• open source
• lightweight
• lingua franca format

Blackfire

• in beta
• hosted service
• nice user interface

Practical performance profiling

• bookmarklet trigger
• web viewer

Complete in–browser workflow.

Hands off, always on

• automated data collection
• looking for anomalies
• in multiple contexts

New Relic

• involved server setup
• collects from many technologies
• dumbs it down magnificently

WP Performance Profiler

• WordPress plugin
• pure PHP ( no extension )
• contexts ( front/admin/cron/ajax )

Thank you for listening! Questions?