Sindangan: Béda antarrépisi

Dina [[élmu komputer]], '''sindangan''' ([[basa Inggris|Ing.]] ''cache'', dibaca "kés") hartina kumpulan data salinan ti nu aslina nu disimpen di tempat séjén. Hal ieu ditujukeun pikeun ngirit, mun data aslina "mahal", dina harti hésé dicokotna. Mun datana geus disindangkeun (''cached''), engkéna aksés data téh bakal leuwih gampang.

 

 

A simple definition of ''Cache'' would be: ''A temporary storage area where frequently accessed data can be stored for rapid access''.

 

 

The data in the backing store may be changed by entities other than the cache, in which case the copy in the cache may become out-of-date or '''stale'''. Alternatively, when the client updates the data in the cache, copies of that data in other caches will become stale. Communication protocols between the cache managers which keep the data consistent are known as [[cache coherency|coherency protocols]].

 

 

===Disk buffer===

(also known as ''disk cache'' or ''cache buffer'')

* '''[[Native Command Queuing|Command queuing]]''': Newer [[Serial ATA|SATA]] and most [[SCSI]] disks can accept multiple commands while any one command is in operation. These commands are stored by the disk's embedded computer until they are completed. Should a read reference the data at the destination of a queued write, the write's data will be returned. Command queuing is different from write acceleration in that the main computer's operating system is notified when data are actually written onto the magnetic media. The OS can use this information to keep the filesystem consistent through rescheduled writes.

 

CPU caches are generally managed entirely by hardware. Other caches are managed by a variety of software. The cache of disk sectors in main memory is usually managed by the operating system [[Kernel (computer science)|kernel]] or [[file system]]. The BIND [[Domain Name System|DNS]] daemon caches a mapping of domain names to IP addresses, as does a resolver library.

 

Another type of caching is storing computed results that will likely be needed again, or [[memoization]]. An example of this type of caching is [[ccache]], a program that caches the output of the compilation to speed up the second-time compilation.

 

 

Buffers are allocated by various processes to use as input queues, etc. Most of the time, buffers are some processes' output, and they are file buffers. A simplistic explanation of buffers is that they allow processes to temporarily store input in memory until the process can deal with it.

*[[Sindangan ramat]]

 

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