About: Page cache

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In computing, a page cache, sometimes also called disk cache, is a transparent cache for the pages originating from a secondary storage device such as a hard disk drive (HDD) or a solid-state drive (SSD). The operating system keeps a page cache in otherwise unused portions of the main memory (RAM), resulting in quicker access to the contents of cached pages and overall performance improvements. A page cache is implemented in kernels with the paging memory management, and is mostly transparent to applications.

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  • In computing, a page cache, sometimes also called disk cache, is a transparent cache for the pages originating from a secondary storage device such as a hard disk drive (HDD) or a solid-state drive (SSD). The operating system keeps a page cache in otherwise unused portions of the main memory (RAM), resulting in quicker access to the contents of cached pages and overall performance improvements. A page cache is implemented in kernels with the paging memory management, and is mostly transparent to applications. Usually, all physical memory not directly allocated to applications is used by the operating system for the page cache. Since the memory would otherwise be idle and is easily reclaimed when applications request it, there is generally no associated performance penalty and the operating system might even report such memory as "free" or "available". When compared to main memory, hard disk drive read/writes are slow and random accesses require expensive disk seeks; as a result, larger amounts of main memory bring performance improvements as more data can be cached in memory. Separate disk caching is provided on the hardware side, by dedicated RAM or NVRAM chips located either in the disk controller (in which case the cache is integrated into a hard disk drive and usually called disk buffer), or in a disk array controller. Such memory should not be confused with the page cache. (en)
  • 버퍼 캐시(buffer cache)는 최근 사용된 디스크 블록을 메모리에 캐시하는 것을 말한다. * 도입 배경디스크 입출력 시간이 메모리 접근 시간보다 크고, 디스크 블록의 접근 패턴에 지역성이 있기 때문에 디스크 블록의 정보를 메모리 공간에 저장해두면 읽기/쓰기 등의 작업시 응답시간을 줄일 수 있다. * 특징가상 메모리는 MMU와 같은 하드웨어의 지원을 받는 반면, 버퍼 캐시는 그렇지 않다. 읽기와 쓰기 동작의 수행 결과가 실제 디스크의 내용과 적이다. (ko)
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  • 버퍼 캐시(buffer cache)는 최근 사용된 디스크 블록을 메모리에 캐시하는 것을 말한다. * 도입 배경디스크 입출력 시간이 메모리 접근 시간보다 크고, 디스크 블록의 접근 패턴에 지역성이 있기 때문에 디스크 블록의 정보를 메모리 공간에 저장해두면 읽기/쓰기 등의 작업시 응답시간을 줄일 수 있다. * 특징가상 메모리는 MMU와 같은 하드웨어의 지원을 받는 반면, 버퍼 캐시는 그렇지 않다. 읽기와 쓰기 동작의 수행 결과가 실제 디스크의 내용과 적이다. (ko)
  • In computing, a page cache, sometimes also called disk cache, is a transparent cache for the pages originating from a secondary storage device such as a hard disk drive (HDD) or a solid-state drive (SSD). The operating system keeps a page cache in otherwise unused portions of the main memory (RAM), resulting in quicker access to the contents of cached pages and overall performance improvements. A page cache is implemented in kernels with the paging memory management, and is mostly transparent to applications. (en)
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  • 버퍼 캐시 (ko)
  • Page cache (en)
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