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Memory hierarchy of an AMD Bulldozer server. The number of levels in the memory hierarchy and the performance at each level has increased over time. The type of memory or storage components also change historically. [6] For example, the memory hierarchy of an Intel Haswell Mobile [7] processor circa 2013 is:
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.
A von Neumann architecture scheme. The von Neumann architecture—also known as the von Neumann model or Princeton architecture—is a computer architecture based on the First Draft of a Report on the EDVAC, [1] written by John von Neumann in 1945, describing designs discussed with John Mauchly and J. Presper Eckert at the University of Pennsylvania's Moore School of Electrical Engineering.
The memory traffic denotes the number of bytes of memory transfers incurred during the execution of the kernel or application. [1] In contrast to W {\displaystyle W} , Q {\displaystyle Q} is heavily dependent on the properties of the chosen platform, such as for instance the structure of the cache hierarchy.
Diagram showing the memory hierarchy of a modern computer architecture: Date: 20 August 2009, 08:34 (UTC) Source: ComputerMemoryHierarchy.png; Author:
The most common modification builds a memory hierarchy with separate CPU caches for instructions and data at lower levels of the hierarchy. There is a single address space for instructions and data, providing the von Neumann model, but the CPU fetches instructions from the instruction cache and fetches data from the data cache.
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Diagram showing the memory hierarchy of a modern computer architecture: Date: 9 February 2010, 19:40 (UTC) Source: ComputerMemoryHierarchy.png; Author: