Profiling PHP - AmsterdamPHP Meetup - 2014-11-20
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The document discusses profiling in PHP, defining it as dynamic program analysis that measures memory and time complexity, with a focus on optimizing applications. It contrasts dynamic analysis, which involves executing programs, with static analysis that reviews code structure without execution. It also highlights tools for profiling, such as Xdebug and Xhprof, and stresses the importance of profiling for improving application performance and user experience.
![USEFUL TOOLS
XHProf Helper for Chrome
XHProf Helper for Firefox
Sets $_COOKIE['_profile'] to 1](https://image.slidesharecdn.com/profilingphp-141120191618-conversion-gate01/85/Profiling-PHP-AmsterdamPHP-Meetup-2014-11-20-41-320.jpg)
Profiling PHP - AmsterdamPHP Meetup - 2014-11-20
- 1. PROFILING PHP A DIVE INTO YOUR APPLICATION Dennis de Greef / @dennisdegreef AmsterdamPHP
- 3. DEFINITION profiling is a form of dynamic program analysis that measures, for example, the space (memory) or time complexity of a program, the usage of particular instructions, or the frequency and duration of function calls. Most commonly, profiling information serves to aid program optimization.
- 5. YEAH... LETS FIRST LOOK AT IT'S COUNTERPART...
- 7. DEFINITION Static program analysis is the analysis of computer software that is performed without actually executing programs The term is usually applied to the analysis performed by an automated tool, with human analysis being called program understanding, program comprehension or code review.
- 8. STATIC ANALYSIS TOOLS There are a set of tools which perform static code analysis. These tools can be integrated within an automated build. PHP Mess Detector PHP Copy/Paste Detector PHP CodeSniffer PHP Dead Code Detector There is a nice page containing a predefined set of tools for a build to be found at Jenkins PHP
- 9. BUT...
- 10. THESE TOOLS ONLY ANALYSE HOW YOUR CODE IS STRUCTURED, NOT HOW IT BEHAVES.
- 11. DYNAMIC ANALYSIS
- 12. DEFINITION The analysis of computer software that is performed by executing programs on a real or virtual processor. For dynamic program analysis to be effective, the target program must be executed with sufficient test inputs to produce interesting behavior. Use of software testing measures such as code coverage helps ensure that an adequate slice of the program's set of possible behaviors has been observed.
- 13. CALLSTACK A callstack is the order in which statements are exectuted. A common callstack, is an Exception trace. This trace shows all the statements executed before an exception is thrown.
- 14. CALLGRAPH A callgraph is a visual representation of a callstack. In large applications this graph can give you better insight on how an application is wired.
- 15. PROFILING DATA Usually, the data gathered with a profiler can be represented in stacks or graphs. They can include information regarding memory- and cpu-usage.
- 16. WHY?
- 17. REASONS Debugging CPU performance Debugging memory performance Debugging IO performance See what function is called how much Gain insight of the black box that is the application
- 18. REASONS We live in a digital age where we want everything instantly. According to a case study from Radware , 51 percent of online shoppers in the U.S claimed if a site is too slow they will not complete a purchase. Nowadays, search engine indexing also accounts for page load. The psychology of web performance SEO 101: How important is site speed in 2014? Case study from Radware
- 19. WARNING! Premature optimization is the root of all evil -- Donald Knuth Only perform optimization when there is a need to.
- 20. CAUSE OF ISSUES
- 21. COMMON ISSUES Network slowdown Datastore slowdown External resources (API, Filesystems, Network sockets, etc) Bad code(tm)
- 22. ACTIVE VS PASSIVE Profiling PHP Part 1 (Davey Shafik)
- 23. ACTIVE PROFILER Used during development Gather more information than passive profilers Performance impact is bigger Should _NOT_ be used in production Example: Xdebug
- 24. PASSIVE PROFILER Minimal impact on performance Gathers less but sufficient information to diagnose issue Examples: XHProf, New Relic, Blackfire.io
- 25. XDEBUG
- 26. XDEBUG Generates cachegrind files (like Valgrind for C) Can be analysed by KCacheGrind among others Cachegrind files are relatively big in size Also a developer tool for breakpoints and remote debugging Active profiler
- 27. ENABLE XDEBUG PROFILING # php.ini settings xdebug.profiler_enable=1 xdebug.profiler_output_dir=/path/to/store/snapshots xdebug.profiler_enable_trigger=1
- 33. XHPROF
- 34. XHPROF Developed by Facebook and released as open-source in 2009 PECL extension Lightweight on profiling data Lightweight on profiling performance hit Passive profiler Includes webgui for reviewing and comparing profiling data
- 35. INSTALLATION # Linux (using apt or yum) apt-get install -y php5-xhprof # OSX (using homebrew) brew install php56-xhprof # For Windows, use PECL or download a .dll somewhere, or compile for your own /! NOTE: Don't forget to restart if running through a webserver /!
- 36. WORDPRESS EXAMPLE // index.php xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY); /** Loads the WordPress Environment and Template */ require( dirname( __FILE__ ) . '/wp-blog-header.php' ); $xhprof_data = xhprof_disable(); include_once 'xhprof_lib/utils/xhprof_lib.php'; include_once 'xhprof_lib/utils/xhprof_runs.php'; $xhprof_runs = new XHProfRuns_Default(); $run_id = $xhprof_runs->save_run($xhprof_data, "xhprof_foo");
- 37. CALLSTACK
- 38. CALLGRAPH
- 39. CALLGRAPH
- 40. CALLGRAPH
- 41. USEFUL TOOLS XHProf Helper for Chrome XHProf Helper for Firefox Sets $_COOKIE['_profile'] to 1
- 42. XHGUI Web frontend for profile data Requires MongoDB Shows callstacks Shows callgraphs Can compare different runs
- 43. XHGUI
- 44. XHGUI
- 45. XHGUI COMPARE
- 46. XHGUI COMPARE
- 48. XHGUI CALLSTACK
- 49. LINK0
- 50. LINK0/PROFILER Focused on XHProf Has multiple persistence layers for storing profiles Memory Flysystem ZendDbAdapter MongoDB (work in progress) Available on composer/packagist Fully Object-orientated 100% code coverage http://github.com/link0/profiler
- 51. GETTING STARTED Bootstrapping the profiler $profiler = new Link0ProfilerProfiler(); $profiler->start(); print_r($profiler->stop()); Adding a PersistenceHandler $persistenceHandler = new Link0ProfilerPersistenceHandlerMemoryHandler(); $ profiler = new Link0ProfilerProfiler( $persistenceHandler); Flysystem example $filesystemAdapter = new LeagueFlysystemAdapterLocal('/tmp/profiler'); $ $filesystemAdapter); filesystem = new Link0ProfilerFilesystem( persistenceHandler = new Link0ProfilerPersistenceHandlerFilesystemHandler( profiler = new Link0ProfilerProfiler( $$ $persistenceHandler);
- 53. SOME IDEAS Enable on production with sampling Aggregate all profiles to centralized machine/cluster Integrate into continuous deployment Run profiling on acceptance environment Alert when compared differences surpass threshold Codeception integration Find business use-cases that are slow Make a case for refactoring to the business Focus on the customers emulated experience
- 54. ANY QUESTIONS?
- 55. USEFUL LINKS Profiling PHP with PhpStorm and Xdebug Profiling PHP with PhpStorm and Zend Debugger XDebug Profiler documentation XHProf PHP documentation Profiling with XHProf and XHGui http://github.com/link0/profiler
- 56. I <3 FEEDBACK Joind.in: GitHub: Twitter: IRC: link0 on Freenode https://joind.in/12802 http://github.com/dennisdegreef @dennisdegreef #amsterdamphp SLIDES ARE ALSO ON JOIND.IN