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더 빨라진 Android n

  1. 1. 더 빨라진 Android N GDE Android TossLab Android Developer 블로그 : https://medium.com/@jsuch2362
  2. 2. 더 빨라진 Android N 앱 실행/동작이 더 빨라짐 시스템 업데이트가 더 빨라짐
  3. 3. 왜? 어떻게?
  4. 4. AOT JIT AOT 에 JIT 를 더하다
  5. 5. 여기서 잠깐 AOT? JIT?
  6. 6. AOT? JIT? JIT : 안드로이드 프로요 부터 추가 됨 - Just In Time Compiling - Class 파일을 실행 시점에 해당 시스템에 적합하게 변환 AOT : 안드로이드 L 부터 추가 (L 에서는 expremental) - Ahead Of Time Compiling - 설치 되는 시점에 시스템에 적합하게 변환
  7. 7. 앱 실행 AOT >>> JIT
  8. 8. Nougat 은 왜 JIT 로 돌아왔나?
  9. 9. AOT 와 JIT 비교
  10. 10. AOT 의 약점 OS 업데이트 전략 변경 - 2015 년 부터 Secure 패치로 분기에 2~3회 가량 OS 업데이트 - AOT 환경은 모든 Application 의 업데이트 요구 설치 시간, 공간 점유, 배터리에 취약
  11. 11. JIT 는 약점이 없나?
  12. 12. 앱 동작이 느리다.
  13. 13. 설치를 위해 동작을 포기한다??
  14. 14. Nougat 은 어떻게 더 빨라졌나?
  15. 15. Welcome back, JIT 실제론 더 빨라졌다. - 앱 실행 - M 대비 3배 더 빨라짐 - JIT Compiling 을 Background 로 전환 - 자주 쓰는 기능(Hot Method) 에 대해서만 Compiling - GC 대상에 대한 캐시
  16. 16. 앱 첫 실행시 첫 실행은 JIT 기반 사용자의 앱 사용을 Profiling Profiling 기반으로 컴파일 다음 실행에 컴파일된 정보로 앱 실행
  17. 17. 최적화 후 실행 컴파일된 앱은 AOT + JIT 혼합 상태 사용자의 앱 사용을 Profiling Profiling 기반으로 컴파일 컴파일 결과물로 앱 실행 계속적으로 반복
  18. 18. 여전히 의문 동작은 빨라졌으나 최초 실행은 여전히 “?”
  19. 19. JIT Compilation 의 변화
  20. 20. 기존 JIT APK 압축 해제 시간 JIT Compilation
  21. 21. Nougat 의 JIT APK 는 설치 시점에 압축 해제 최초 실행에 관련된 class 먼저 loading 후 전달. 나머진 Background 에서 처리
  22. 22. JIT vs AOT vs JIT+AOT AOT 만큼은 아니나 JIT + AOT 는 근접한 성능을 보임
  23. 23. JIT Compilation 의 Background 이점 UI Thread 동작에 더 많은 여유를 줌으로써 사용감을 더 좋게 함 Android M 과 N -> 4% 프레임 드랍
  24. 24. Profiling Guided Compilation 으로 인해 JIT 이 비해 CPU 사용율이 낮아짐 배터리 가용성 증가
  25. 25. Profiling Guided Compilation
  26. 26. 프로파일 대상 Hot Method Impact Startup Share Library 자주 실행하는 메소드 실행과 관련된 클래스 외부에서 요청에 의한 동작
  27. 27. AOT 컴파일 데몬 로직
  28. 28. Profile Guided Compilation 의 이점 최적화 되지 않은 부분만 최적화 - JIT 에 의해 소모 되는 부분 최소화 - 배터리 절약 최소한으로만 AOT 코드 생성 - 저장공간 절약
  29. 29. 설치 공간 점유 비교 Android M 대비 50% 절약
  30. 30. Application Image
  31. 31. Application Image 생성 초기 실행에 관련된 부분을 이미지로 저장
  32. 32. Application Image 동작 앱이 실행 되면 이미지를 불러와 메모리에 추가
  33. 33. Profile + Image 는 5~10% 더 빠름
  34. 34. GC 의 동작 개선 Object Allocation 동작 개선
  35. 35. 정리
  36. 36. Nougat 의 변화 빨라진 컴파일러와 인터프리터 JIT 컴파일러 추가 Profile Guided 컴파일 Application Image 더 빨라진 Object Allocation
  37. 37. One more Thing
  38. 38. Q & A 앱이 업데이트 되면 Optimized Code 는? - 삭제 됨. 설치되면 Empty Profile 상태 - 빈번한 업데이트에는 영향이 간다. 고려해야 한다. Hot Method 기준은? - Key Matrix 가 존재하며 AOSP 코드를 봐달라

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