Profiling PHP @ SymfonyCon Berlin 2016

You cannot improve what you cannot measure. That's why profiling applications should always be the first step before trying to improve its performance. Learn how to spot your applications' bottlenecks and how to adopt profiling into your developer pipeline.

Transcript

1. PROFILING PHP SEBASTIAN GRODZICKI
2. WHO USES PHP?
3. WHO USES PHP 7?
4. WHO USES PHP 7.1?
5. WHO USES PHPUNIT?
6. WHO USES XDEBUG?
7. WHO USES BLACKFIRE?
8. SEBASTIAN GRODZICKI CTO @ SHOWROOM
9. 40% OF USERS
 ABANDON A WEBSITE
 THAT TAKES MORE THAN
 3 SECONDS TO LOAD Akamai STATISTICS
10. 500 MS DELAY CAUSED 20% TRAFFIC DECREASE Google STATISTICS
11. 100 MS DELAY CAUSED 1% DROP IN REVENUE Amazon STATISTICS
12. PROFILING IS A WAY TO MEASURE WHERE A PROGRAM SPENDS TIME MathWorks DEFINITION
13. PROFILING IS ABOUT GATHERING DATA Fabien Potencier DEFINITION
14. MICROTIME
15. <?php
 
 $start = microtime(true);
 
 // do something
 
 $end = microtime(true);
 
 echo $end - $start;
16. <?php
 
 // do something
 
 $time = microtime(true);
 $time -= $_SERVER['REQUEST_TIME_FLOAT'];
 
 echo $time;
17. log_format foobar '$upstream_response_time';
 access_log /var/log/nginx/access.log foobar;
18. MEMORY_GET_USAGE
19. <?php
 
 $start = memory_get_usage(true);
 
 // do something
 
 $end = memory_get_usage(true);
 
 echo $end - $start;
20. PROS & CONS MICROTIME & MEMORY_GET_USAGE ▸ built in PHP ▸ no training required ▸ data without context ▸ require code change
21. Xdebug
22. xdebug.profiler_enable_trigger = 1 http://url?XDEBUG_PROFILE=1
23. KCACHEGRIND
24. WEBGRIND
25. PROS & CONS XDEBUG PROFILER ▸ zero code change ▸ cachegrind compatible file format ▸ extension required ▸ huge overhead ▸ unsuitable for production
26. XHProf
27. <?php
 
 xhprof_enable();
 
 // do something
 
 $data = xhprof_disable();
28. # jns/xhprof-bundle
 jns_xhprof:
 location_web: http://xhprof.localhost
 enabled: true
29. XHPROF
30. PROS & CONS XHPROF ▸ suitable for production ▸ diff reports ▸ no longer maintained ▸ missing PHP 7 support
33. PROFILING PHP TIME Wall time I/O CPU Disk I/O Network = = + +
34. PROFILING PHP INCLUSIVE VS EXCLUSIVE TIME function foo()
 {
 $str = bar(); return $str; } function foo()
 {
 $str = bar(); return $str; }
35. BLACKFIRE CONTINUOUS PERFORMANCE TESTING
36. BLACKFIRE CALLGRAPHS
37. BLACKFIRE HOT PATHS
38. DEMO CHROME COMPANION
41. public function getVersion() { $process = new Process($this->getPath() . ' --version'); $process->run(); if (!$process->isSuccessful()) { throw new \RuntimeException($process->getErrorOutput()); } $version = substr($process->getOutput(), 12); return trim($version); }
42. public function getVersion() { static $version; if (null !== $version) { return trim($version); } $process = new Process($this->getPath() . ' --version'); $process->run(); if (!$process->isSuccessful()) { throw new \RuntimeException($process->getErrorOutput()); } $version = substr($process->getOutput(), 12); return trim($version); }
44. DEMO BLACKFIRE CURL
47. DEMO BLACKFIRE RUN
50. ASSERTIONS
51. PROFILING PHP ASSERTIONS tests: "Application should never hit the DB": path: "/.*" assertions: - "metrics.sql.queries.count == 0"
52. PROFILING PHP ASSERTIONS tests: "Homepage should never call the API": path: "/" assertions: - "metrics.http.requests.count == 0"
53. PROFILING PHP ASSERTIONS tests: "Pages should be fast enough": path: "/.*" assertions: - "main.wall_time < 100ms"
55. BUILDS
59. PHP SDK
60. BLACKFIRE PHP SDK ▸ composer require blackfire/php-sdk ▸ $blackfire = new \Blackfire\Client(); ▸ $probe = $blackfire->createProbe(); ▸ $profile = $blackfire->endProbe($probe);
61. PHPUNIT
62. <?php
 
 use Blackfire\Bridge\PhpUnit\TestCaseTrait;
 use Blackfire\Profile;
 
 class IntegrationTest extends \PHPUnit_Framework_TestCase {
 use TestCaseTrait;
 /**
 * @requires extension blackfire
 */
 public function testSomething() {
 $config = new Profile\Configuration();
 $config
 ->assert('metrics.sql.queries.count < 5', 'SQL queries')
 ->assert('metrics.twig.render.count < 3', 'Rendered Twig templates')
 ->assert('metrics.twig.compile.count == 0', 'Twig compilation')
 ;
 }
 }
63. medium.com/@sgrodzicki
64. blackfire.io/docs/24-days
65. NEW RELIC
66. NEW RELIC
67. TIDEWAYS
68. TIDEWAYS
69. QUESTIONS?
70. THANK YOU! https://speakerdeck.com/sgrodzicki https://twitter.com/sebgrodzicki