A buffer often adjusts timing by implementing a queue (or FIFO) algorithm in memory, simultaneously writing data into the queue at one rate and reading it at another rate.
Buffers are used for many purposes, such as
A cache often also acts as a buffer, and vice versa. However, cache operates on the premise that the same data will be read from it multiple times, that written data will soon be read, or that there is a good chance of multiple reads or writes to combine to form a single larger block. Its sole purpose is to reduce accesses to the underlying slower storage. Cache is also usually an abstraction layer that is designed to be invisible.
A 'Disk Cache' or 'File Cache' keeps statistics on the data contained within it and commits data within a time-out period in write-back modes. A buffer does none of this.
A buffer is primarily used for input, output, and sometimes ''very temporary'' storage of data that is either enroute between other media or data that may be modified in a non-sequential manner before it is written (or read) in a sequential manner.
Good examples include:
One of the more serious problems in the design of automatic digital computers is that of getting the calculated results out of the machine rapidly enough to avoid delaying the further progress of the calculations. In many of the problems to which a general-purpose computer is applied the amount of output data is relatively great—so great that serious inefficiency would result from forcing the computer to wait for these data to be typed on existing printing devices. This difficulty has been solved in the SEAC by providing magnetic recording devices as output units. These devices are able to receive information from the machine at rates up to 100 times as fast as an electric typewriter can be operated. Thus, better efficiency is achieved in recording the output data; transcription can be made later from the magnetic recording device to a printing device without tying up the main computer.
Category:Synchronization Category:Computer memory
ar:صوان (معلوماتية) bg:Буфер (изчислителна техника) ca:Memòria intermèdia cs:Vyrovnávací paměť de:Puffer (Informatik) et:Puhvermälu el:Προσωρινή μνήμη (υπολογιστές) es:Buffer de datos fa:حافظه میانگیر fr:Mémoire tampon ko:버퍼 (전산학) hr:Međuspremnik it:Buffer he:חוצץ kk:Буферлеу (информатика) nl:Buffer (geheugen) ja:バッファ pl:Bufor (programowanie) pt:Buffer (ciência da computação) ru:Буфер (информатика) sk:Vyrovnávacia pamäť sr:Бафер fi:Puskurimuisti sv:Buffert (datalogi) tr:Ara Bellek uk:Буфер (інформатика) zh:緩衝器This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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