Medindo a Performance de Códigos PHP

Transcript

1. Medindo a Performance de
   Códigos PHP
   Por Jonata Weber
   

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2. @JonataWeber
   

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3. www.app2sales.com
   

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5. Performance
   Computer performance is the amount of work accomplished by a
   computer system.
   

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6. Aspects of performance
   ● Availability
   ● Response Time
   ● Processing Speed
   ● Latency
   ● Bandwidth
   ● Throughtput
   ● Scalability
   

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7. Pick any two
   Cheap
   Good
   Fast
   

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8. Development vs Production
   

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9. Tools
   

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10. Faker
    

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11. Profile Before Optimizing
    

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12. $then = microtime();
    myFunc();
    $now = microtime();
    echo sprintf("Elapsed: %f", $now - $then);
    There's a better way, right? :)
    

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13. Apache Benchmarking
    $ ab -n 100 -c 10 http://localhost:8000
    

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14. HTTP Benchmarking
    $ wrk -t12 -c400 -d30s http://localhost:8000
    

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15. Testing High Availability
    

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16. Load testing tool
    

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18. Profiling
    

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20. Install the xdebug
    $ pecl install xdebug
    

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21. Starting the Profiler (php.ini)
    xdebug.profiler_enable=1
    xdebug.profiler_output_dir
    xdebug.profiler_enable_trigger=1
    More informations:
    https://xdebug.org/docs/profiler
    

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22. Profiler Viewer
    

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23. Profiler Viewer (in the browser)
    

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24. Flame Graphs
    

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25. XHProf: A Hierarchical Profiler for PHP
    

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30. Demo
    

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31. Problemas comuns
    

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32. Problemas comuns
    ● Arquitetura
    ● Workload
    

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33. Arquitetura
    ● Sem cache;
    ● Hardware mal dimensionado;
    ● Aplicação single thread;
    ● Latência de rede não prevista.
    

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34. Workload
    ● Mais usuários que o esperado;
    ● Cache mal planejado.
    

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35. Otimização precoce,
    fazer ou não fazer, eis a questão.
    

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36. YAGNI
    You Aren't Gonna Need It
    

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37. Mas, as vezes é preciso!
    

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38. Make work.
    Make right.
    Make fast.
    

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39. O que não pode ser medido não
    pode ser melhorado.
    

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40. Esteja pronto, sempre!
    

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42. Obrigado!
    @JonataWeber
    

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43. Referências
    https://speakerdeck.com/tarsisazevedo/performance-analysis-101
    http://wiki.c2.com/?PrematureOptimization
    http://wiki.c2.com/?ProfileBeforeOptimizing
    http://wiki.c2.com/?MakeItWorkMakeItRightMakeItFast
    

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