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  2. Memory hierarchy - Wikipedia

    en.wikipedia.org/wiki/Memory_hierarchy

    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: Processor registers – the fastest possible access (usually 1 CPU cycle). A few ...

  3. Random-access memory - Wikipedia

    en.wikipedia.org/wiki/Random-access_memory

    Multiple levels of caching have been developed to deal with the widening gap, and the performance of high-speed modern computers relies on evolving caching techniques. [41] There can be up to a 53% difference between the growth in speed of processor and the lagging speed of main memory access. [42]

  4. Memory timings - Wikipedia

    en.wikipedia.org/wiki/Memory_timings

    Because system performance depends on how fast memory can be used, this timing directly affects the performance of the system. The timing of modern synchronous dynamic random-access memory (SDRAM) is commonly indicated using four parameters: CL , T RCD , T RP , and T RAS in units of clock cycles ; they are commonly written as four numbers ...

  5. Non-uniform memory access - Wikipedia

    en.wikipedia.org/wiki/Non-uniform_memory_access

    Non-uniform memory access (NUMA) is a computer memory design used in multiprocessing, where the memory access time depends on the memory location relative to the processor. Under NUMA, a processor can access its own local memory faster than non-local memory (memory local to another processor or memory shared between processors). [1]

  6. Cache performance measurement and metric - Wikipedia

    en.wikipedia.org/wiki/Cache_performance...

    Until 2001–05, CPU speed, as measured by clock frequency, grew annually by 55%, whereas memory speed only grew by 7%. [1] This problem is known as the memory wall. The motivation for a cache and its hierarchy is to bridge this speed gap and overcome the memory wall. The critical component in most high-performance computers is the cache.

  7. Cache hierarchy - Wikipedia

    en.wikipedia.org/wiki/Cache_hierarchy

    Accessing main memory can act as a bottleneck for CPU core performance as the CPU waits for data, while making all of main memory high-speed may be prohibitively expensive. High-speed caches are a compromise allowing high-speed access to the data most-used by the CPU, permitting a faster CPU clock. [2] Generic multi-level cache organization