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
   

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2. WHO USES
   PHP?
   

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3. WHO USES
   PHP 7?
   

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4. WHO USES
   PHP 7.1?
   

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5. WHO USES
   PHPUNIT?
   

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6. WHO USES
   XDEBUG?
   

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7. WHO USES
   BLACKFIRE?
   

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8. SEBASTIAN
   GRODZICKI
   CTO @ SHOWROOM
   

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9. 40% OF USERS

   ABANDON A WEBSITE

   THAT TAKES MORE THAN

   3 SECONDS TO LOAD
   Akamai
   STATISTICS
   

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10. 500 MS DELAY CAUSED
    20% TRAFFIC DECREASE
    Google
    STATISTICS
    

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11. 100 MS DELAY CAUSED
    1% DROP IN REVENUE
    Amazon
    STATISTICS
    

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12. PROFILING IS A WAY TO
    MEASURE WHERE A
    PROGRAM SPENDS TIME
    MathWorks
    DEFINITION
    

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13. PROFILING IS ABOUT
    GATHERING DATA
    Fabien Potencier
    DEFINITION
    

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14. MICROTIME
    

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15. 

    $start = microtime(true);

    

    // do something

    

    $end = microtime(true);

    

    echo $end - $start;
    

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16. 

    // do something

    

    $time = microtime(true);

    $time -= $_SERVER['REQUEST_TIME_FLOAT'];

    

    echo $time;
    

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17. log_format foobar '$upstream_response_time';

    access_log /var/log/nginx/access.log foobar;
    

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18. MEMORY_GET_USAGE
    

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19. 

    $start = memory_get_usage(true);

    

    // do something

    

    $end = memory_get_usage(true);

    

    echo $end - $start;
    

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20. PROS & CONS
    MICROTIME & MEMORY_GET_USAGE
    ▸ built in PHP
    ▸ no training required
    ▸ data without context
    ▸ require code change
    

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21. Xdebug
    

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22. xdebug.profiler_enable_trigger = 1
    http://url?XDEBUG_PROFILE=1
    

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23. KCACHEGRIND
    

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24. WEBGRIND
    

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25. PROS & CONS
    XDEBUG PROFILER
    ▸ zero code change
    ▸ cachegrind compatible file format
    ▸ extension required
    ▸ huge overhead
    ▸ unsuitable for production
    

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26. XHProf
    

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27. 

    xhprof_enable();

    

    // do something

    

    $data = xhprof_disable();
    

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28. # jns/xhprof-bundle

    jns_xhprof:

    location_web: http://xhprof.localhost

    enabled: true
    

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29. XHPROF
    

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30. PROS & CONS
    XHPROF
    ▸ suitable for production
    ▸ diff reports
    ▸ no longer maintained
    ▸ missing PHP 7 support
    

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33. PROFILING PHP
    TIME
    Wall time I/O
    CPU
    Disk
    I/O Network
    =
    =
    +
    +
    

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34. PROFILING PHP
    INCLUSIVE VS EXCLUSIVE TIME
    function foo()

    {

    $str = bar();
    return $str;
    }
    function foo()

    {

    $str = bar();
    return $str;
    }
    

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35. BLACKFIRE
    CONTINUOUS PERFORMANCE TESTING
    

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36. BLACKFIRE
    CALLGRAPHS
    

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37. BLACKFIRE
    HOT PATHS
    

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38. DEMO
    CHROME COMPANION
    

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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);
    }
    

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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);
    }
    

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44. DEMO
    BLACKFIRE CURL
    

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47. DEMO
    BLACKFIRE RUN
    

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50. ASSERTIONS
    

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51. PROFILING PHP
    ASSERTIONS
    tests:
    "Application should never hit the DB":
    path: "/.*"
    assertions:
    - "metrics.sql.queries.count == 0"
    

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52. PROFILING PHP
    ASSERTIONS
    tests:
    "Homepage should never call the API":
    path: "/"
    assertions:
    - "metrics.http.requests.count == 0"
    

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53. PROFILING PHP
    ASSERTIONS
    tests:
    "Pages should be fast enough":
    path: "/.*"
    assertions:
    - "main.wall_time < 100ms"
    

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55. BUILDS
    

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59. PHP SDK
    

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60. BLACKFIRE
    PHP SDK
    ▸ composer require blackfire/php-sdk
    ▸ $blackfire = new \Blackfire\Client();
    ▸ $probe = $blackfire->createProbe();
    ▸ $profile = $blackfire->endProbe($probe);
    

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61. PHPUNIT
    

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62. 

    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')

    ;

    }

    }
    

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63. medium.com/@sgrodzicki
    

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64. blackfire.io/docs/24-days
    

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65. NEW RELIC
    

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66. NEW RELIC
    

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67. TIDEWAYS
    

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68. TIDEWAYS
    

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69. QUESTIONS?
    

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70. THANK YOU!
    https://speakerdeck.com/sgrodzicki
    https://twitter.com/sebgrodzicki
    

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