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A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. [1] A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations.
Cache hierarchy, or multi-level cache, is a memory architecture that uses a hierarchy of memory stores based on varying access speeds to cache data. Highly requested data is cached in high-speed access memory stores, allowing swifter access by central processing unit (CPU) cores.
Diagram of a CPU memory cache operation. In computing, a cache (/ k æ ʃ / ⓘ KASH) [1] is a hardware or software component that stores data so that future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation or a copy of data stored elsewhere.
A drawback of an inclusive policy is that the unique memory capacity of the cache is determined by the lower level cache. Unlike the case of exclusive cache, where the unique memory capacity is the combined capacity of all caches in the hierarchy. [4]
L2 cache is important for the Lion Cove core architecture as Intel's reliance on L2 cache is to insulate the cores from the L3 cache's slow performance. [8] Lion Cove was designed to accommodate L2 caches configurable from 2.5 MB up to 3 MB depending on the product.
A victim cache is a hardware cache designed to reduce conflict misses and enhance hit latency for direct-mapped caches. It is utilized in the refill path of a Level 1 cache, where any cache-line evicted from the cache is cached in the victim cache. As a result, the victim cache is populated only when data is evicted from the Level 1 cache.
Typical processor cores contains the components of the processor involved in executing instructions, including the ALU, FPU, L1 and L2 cache.In contrast, Uncore functions include QPI controllers, L3 cache, snoop agent pipeline, on-die memory controller, on-die PCI Express Root Complex, and Thunderbolt controller. [3]
The resulting load on memory use is known as pressure (respectively register pressure, cache pressure, and (main) memory pressure). Terms for data being missing from a higher level and needing to be fetched from a lower level are, respectively: register spilling (due to register pressure : register to cache), cache miss (cache to main memory ...