cache

a hiding place; a hidden store of goods: He had a cache of nonperishable food in case of an invasion.
Not to be confused with:cachet – an official seal, as on a letter or document; a distinguishing feature: Courtesy is the cachet of a gracious hostess.; superior status; prestige: The diplomatic corps has a certain cachet.cash – currency or coins: They’d rather have cash than a credit card.

cache

C0008800 (kăsh)n.1. a. An amount of goods or valuables, especially when kept in a concealed or hard-to-reach place: maintained a cache of food in case of emergencies.b. The concealed or hard-to-reach place used for storing a cache.2. A fast storage buffer in the central processing unit of a computer. Also called cache memory.tr.v. cached, cach·ing, cach·es To hide or store in a cache. See Synonyms at hide¹.

[French, from Middle French, from cacher, to hide, from Old French, from Vulgar Latin *coācticāre, to store, pack together, frequentative of Latin coāctāre, to constrain, frequentative of cōgere, coāct-, to force; see cogent.]

cache

(kæʃ) n1. a hidden store of provisions, weapons, treasure, etc2. the place where such a store is hidden3. (Computer Science) computing a small high-speed memory that improves computer performancevb4. (tr) to store in a cache5. (Computer Science) (tr) to store in a cache[C19: from French, from cacher to hide]

cache

(kæʃ)

n., v. cached, cach•ing. n. 1. a hiding place for ammunition, food, treasures, etc. 2. anything hidden in a cache. 3. a piece of computer hardware or a section of RAM dedicated to selectively storing and speeding access to frequently used program commands or data. v.t. 4. to hide in a cache. [1585–95; < French, n. derivative of cacher to hide < Vulgar Latin *coācticāre to stow away, orig. to pack together]

cache

In evasion and recovery operations, source of subsistence and supplies, typically containing items such as food, water, medical items, and/or communications equipment, packaged to prevent damage from exposure and hidden in isolated locations by such methods as burial, concealment, and/or submersion, to support evaders in current or future operations. See also concealment; evader; evasion; evasion and recovery; recovery; recovery operations.

Cache

a hiding place, hence, the items hidden; the stores of provisions hidden by travellers or explorers on their journeys.Examples: cache of green boughs, 1866; of jewels; of meat, 1865; of a barrel of pork, 1842; of provisions; of silver, 1860; of treasure.

cache

Past participle: cached
Gerund: caching

Imperative
cache
cache

Present
I cache
you cache
he/she/it caches
we cache
you cache
they cache

Preterite
I cached
you cached
he/she/it cached
we cached
you cached
they cached

Present Continuous
I am caching
you are caching
he/she/it is caching
we are caching
you are caching
they are caching

Present Perfect
I have cached
you have cached
he/she/it has cached
we have cached
you have cached
they have cached

Past Continuous
I was caching
you were caching
he/she/it was caching
we were caching
you were caching
they were caching

Past Perfect
I had cached
you had cached
he/she/it had cached
we had cached
you had cached
they had cached

Future
I will cache
you will cache
he/she/it will cache
we will cache
you will cache
they will cache

Future Perfect
I will have cached
you will have cached
he/she/it will have cached
we will have cached
you will have cached
they will have cached

Future Continuous
I will be caching
you will be caching
he/she/it will be caching
we will be caching
you will be caching
they will be caching

Present Perfect Continuous
I have been caching
you have been caching
he/she/it has been caching
we have been caching
you have been caching
they have been caching

Future Perfect Continuous
I will have been caching
you will have been caching
he/she/it will have been caching
we will have been caching
you will have been caching
they will have been caching

Past Perfect Continuous
I had been caching
you had been caching
he/she/it had been caching
we had been caching
you had been caching
they had been caching

Conditional
I would cache
you would cache
he/she/it would cache
we would cache
you would cache
they would cache

Past Conditional
I would have cached
you would have cached
he/she/it would have cached
we would have cached
you would have cached
they would have cached

cache

A temporary storage area in a computer’s memory.

Thesaurus

Noun	1.	cache - a hidden storage space (for money or provisions or weapons)storage space - the area in any structure that provides space for storage
	2.	cache - a secret store of valuables or moneyhoard, stashfund, store, stock - a supply of something available for future use; "he brought back a large store of Cuban cigars"
	3.	cache - (computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristicsmemory cachebuffer storage, buffer store, buffer - (computer science) a part of RAM used for temporary storage of data that is waiting to be sent to a device; used to compensate for differences in the rate of flow of data between components of a computer systemdisk cache - a cache that stores copies of frequently used disk sectors in random access memory (RAM) so they can be read without accessing the slower diskcomputer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures
Verb	1.	cache - save up as for future usehive up, hoard, lay away, squirrel away, stashlay aside, save up, save - accumulate money for future use; "He saves half his salary"

cache

noun store, fund, supply, reserve, treasury, accumulation, stockpile, hoard, stash (informal) A cache of weapons and explosives was found by the police.

cache

nounA supply stored or hidden for future use:backlog, hoard, inventory, nest egg, reserve, reservoir, stock, stockpile, store, treasure.Slang: stash.verbTo put or keep out of sight:bury, conceal, ensconce, hide, occult, secrete.Slang: plant, stash.

Translations

Cachecacheconservermaintenirréservenascondiglio

cache

Computing a small high-speed memory that improves computer performance

cache

[kash] (computer science) A small, fast storage buffer integrated in the central processing unit of some large computers.

cache

(memory management)/kash/ A small fast memory holdingrecently accessed data, designed to speed up subsequent accessto the same data. Most often applied to processor-memoryaccess but also used for a local copy of data accessible overa network etc.

When data is read from, or written to, main memory a copy isalso saved in the cache, along with the associated main memoryaddress. The cache monitors addresses of subsequent reads tosee if the required data is already in the cache. If it is (acache hit) then it is returned immediately and the mainmemory read is aborted (or not started). If the data is notcached (a cache miss) then it is fetched from main memoryand also saved in the cache.

The cache is built from faster memory chips than main memoryso a cache hit takes much less time to complete than a normalmemory access. The cache may be located on the sameintegrated circuit as the CPU, in order to further reducethe access time. In this case it is often known as primary cache since there may be a larger, slower secondary cacheoutside the CPU chip.

The most important characteristic of a cache is its hit rate- the fraction of all memory accesses which are satisfied fromthe cache. This in turn depends on the cache design butmostly on its size relative to the main memory. The size islimited by the cost of fast memory chips.

The hit rate also depends on the access pattern of theparticular program being run (the sequence of addresses beingread and written). Caches rely on two properties of theaccess patterns of most programs: temporal locality - ifsomething is accessed once, it is likely to be accessed againsoon, and spatial locality - if one memory location isaccessed then nearby memory locations are also likely to beaccessed. In order to exploit spatial locality, caches oftenoperate on several words at a time, a "cache line" or "cacheblock". Main memory reads and writes are whole cache lines.

When the processor wants to write to main memory, the data isfirst written to the cache on the assumption that theprocessor will probably read it again soon. Various differentpolicies are used. In a write-through cache, data iswritten to main memory at the same time as it is cached. In awrite-back cache it is only written to main memory when itis forced out of the cache.

If all accesses were writes then, with a write-through policy,every write to the cache would necessitate a main memorywrite, thus slowing the system down to main memory speed.However, statistically, most accesses are reads and most ofthese will be satisfied from the cache. Write-through issimpler than write-back because an entry that is to bereplaced can just be overwritten in the cache as it willalready have been copied to main memory whereas write-backrequires the cache to initiate a main memory write of theflushed entry followed (for a processor read) by a main memoryread. However, write-back is more efficient because an entrymay be written many times in the cache without a main memoryaccess.

When the cache is full and it is desired to cache another lineof data then a cache entry is selected to be written back tomain memory or "flushed". The new line is then put in itsplace. Which entry is chosen to be flushed is determined by a"replacement algorithm".

Some processors have separate instruction and data caches.Both can be active at the same time, allowing an instructionfetch to overlap with a data read or write. This separationalso avoids the possibility of bad cache conflict betweensay the instructions in a loop and some data in an array whichis accessed by that loop.

See also direct mapped cache, fully associative cache,sector mapping, set associative cache.

cache

(1) To store data locally in order to speed up subsequent retrievals. Pronounced "cash." See Web cache and browser cache.

(2) Reserved areas of memory (RAM) in every computer that are used to speed up processing. Pronounced "cash," they serve as high-speed staging areas that are constantly filled with the next set of instructions or data. Caches have faster input/output than the areas that feed them. For example, memory caches are high-speed memory, which is faster than main memory, and disk caches are main memory, which is faster than disk.

Memory Caches

A memory cache, also called a "CPU cache," is a memory bank that bridges main memory and the processor. Comprising faster static RAM (SRAM) chips than the dynamic RAM (DRAM) used for main memory, the cache allows instructions to be executed and data to be read and written at higher speed. Instructions and data are transferred from main memory to the cache in fixed blocks, known as cache "lines," using a look-ahead algorithm. See cache line, static RAM and dynamic RAM.

Temporal and Spatial (Time and Space)
Caches take advantage of "temporal locality," whereby unchanging data constants such as high-low limits, messages and column headers are used over and over again. Caches also benefit from "spatial locality," because the next instruction to be executed or the next set of data to be processed is often next in line. The more sequential they are, the greater the chance for a "cache hit." If the next item is not in the cache, a "cache miss" occurs, and it must be retrieved from slower main memory.

Levels 1, 2 and 3 (L1, L2, L3)
Today's CPU chips contain two or three caches, with L1 being the fastest. Each subsequent cache is slower and larger than L1, and instructions and data are staged from main memory to L3 to L2 to L1 to the processor. On multicore chips, the L3 cache is generally shared among all the processing cores. See write-back cache and write-through cache.

Memory Cache Hierarchy

The whole idea is to keep staging more instructions and data in a memory that is closer to the speed of the processor. The caches are generally built into the CPU chip. See L2 cache.

Disk Caches

A disk cache is a dedicated block of memory (RAM) in the computer or in the drive controller that bridges storage and CPU. When the disk or SSD is read, a larger block of data is copied into the cache than is immediately required. If subsequent reads find the data already stored in the cache, there is no need to retrieve it from storage, which is slower to access.

If the cache is used for writing, data are queued up at high speed and then written to storage during idle machine cycles by the caching program or the drive controller. See cache coherency, write-back cache, write-through cache, pipeline burst cache, lookaside cache, inline cache, backside cache and NV cache.

Disk Cache

Disk caches are usually a part of main memory comprising common dynamic RAM (DRAM) chips, whereas memory caches (CPU caches) use higher-speed static RAM (SRAM) chips.

cache

cache

cache

cache

cache

cache

Cache

cache

cache

cache

cache

cache

cache

cache

cache

cache

Memory Caches

Disk Caches

cache

cache

cache

CACHE

cache

Synonyms for cache

noun store

Synonyms

Synonyms for cache

noun a supply stored or hidden for future use

Synonyms

verb to put or keep out of sight

Synonyms

Synonyms for cache

noun a hidden storage space (for money or provisions or weapons)

Related Words

noun a secret store of valuables or money

Synonyms

Related Words

noun (computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated

Synonyms

Related Words

verb save up as for future use

Synonyms

Related Words