자바스크립트의 성능이 주요 관심사가 되면서 자바스크립트 엔진은 성능 향상을 위해 적시 컴파일 방식을 사용해왔다. 최근 들어 자바스크립트 엔진은 타입 추론 최적화를 하는 적시 컴파일러를 추가로 도입하여 단계적으로 OSR 기법을 적용하여 최대의 성능 효율을 얻고자 한다. 본 논문에서는 WebKit 브라우저의 자바스크립트 엔진에 적용된 단계적 OSR 기법을 분석하고 실험을 통해 성능 효과를 알아보고자 한다. 실험 결과 자바스크립트 벤치 마크에서는 단계적 OSR을 통해 평균 5.6배의 높은 성능 향상을 얻었지만, 웹 페이지 로딩에서는 단계적 OSR 기법의 한계 또한 확인할 수 있었다.
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