Debugging and Profiling Symfony Apps

Debugging and Profiling symfony applications

by Alvaro VidelaWednesday, February 17, 2010

About Me

• Lead Developer at TheNetCircle.com

• Creator of FireSymfony

• Twitter: @old_sound

• Blog: http://obvioushints.blogspot.com/

Wednesday, February 17, 2010

http://twitter.com/old_sound


http://obvioushints.blogspot.com


About Me

• Lead Developer at TheNetCircle.com

• Creator of FireSymfony - 16.000 downloads

• Twitter: @old_sound

• Blog: http://obvioushints.blogspot.com/






About our symfony site

• 2.000.000+ members

• 250.000+ logins/day

• 300.000+ private messages/day

• 14.000 req/min in the top 6 actions


Let’s talk about:

• Debugging Tools

• Profiling Tools

• Benchmarking Tools

• Live Site Metrics


Symfony Tools


Loggers


sfFileLogger

• logs per controller & environment

• very useful for development

• Prod, disable or set level: err


There’s a lot of information on the logs

• Cache hits

• Cache misses

• Number of Database Queries


AWK

• Extract information using AWK

• use: /(M|m)atch route/

http://gist.github.com/271034




Problems of this approach

• Hard to use with several servers

• Require to ssh and inspect logs in each of the servers

• Hard to visualize data in context


Next Step

A Centralized Logger


Sample Use Case

• CouchDB backend

• One Server collecting logs from 28 PHP machines

• 15 million logs in the first week


A Centralized Logger


5 minute How To

A Redis Logger

http://github.com/videlalvaro/avRedisLoggerPlugin


http://code.google.com/p/redis/


Logger Roadmap


Timers


sfTimer

• Easy to use

• Integrated with symfony debug tools


Using Timers


Problems of this approach

• Require to modify the code to add timers

• Only provides execution time information

• Best suited to run in dev mode


Next Step

Profile with XHProf


XHProf• C extension for PHP

• Open sourced by Facebook

• Hierarchical Profiler

• Extracts:

- Walltime

- Memory Usage


XHProf Web Interface• Single Runs

• Compare Runs

• Aggregate Runs

• Sort runs by:

- Number Function Calls

- Memory Usage

- Walltime


5 minute How To

Adding XHProf to an index.php





symfony 1.0 vs. symfony 1.2*

*sfCompat10Plugin enabled


@old_sound: “Hello World!” Benchmarks Considered Evil! #sflive2010

1 second ago from Cité Universitaire Internationale


Tsung• High performance benchmarking framework

• Open Source

• Distributed benchmarking

• Can simulate user sessions

• Records and replay browser interaction

• Can benchmark HTTP, MySQL, Ejabberd

• Can be extended


Tsung Sessions

• Arrival Phase

• Duration

• Amount of Users

• Meassure system load


Tsung


Metrics


Metrics

Live Site Metrics With Graphite


Graphite

• “... a highly scalable real-time graphing system”

• Open Source

• Text Protocol

• Awesome Graphics Capabilities

http://graphite.wikidot.com/


http://graphite.wikidot.com


Graphite in Action


We use it for• System Load Comparisons

• APC Stats

• Memcache Stats

• Number of Online Users

• AVG module/action request time

• AVG module/action memory usage

• module/action request count


5 minute How To

Adding Graphite to an index.php





Roadmap

•Write C PHP Extension

• Take advantage of Request Life Cycle

• Ease metric recording


Links

• http://www.rabbitmq.com/

• http://tsung.erlang-projects.org/

• http://graphite.wikidot.com/

• http://pecl.php.net/package/xhprof


http://www.rabbitmq.com

http://www.rabbitmq.com

http://tsung.erlang-projects.org

http://tsung.erlang-projects.org



http://pecl.php.net/package/xhprof

http://pecl.php.net/package/xhprof

Questions?


Thanks!

Alvaro Videla





Debugging and Profiling Symfony Apps

Technology

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