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In computer science, locality of reference, also known as the principle of locality, [1] is the tendency of a processor to access the same set of memory locations repetitively over a short period of time. [2] There are two basic types of reference locality – temporal and spatial locality.
In computing, a memory access pattern or IO access pattern is the pattern with which a system or program reads and writes memory on secondary storage.These patterns differ in the level of locality of reference and drastically affect cache performance, [1] and also have implications for the approach to parallelism [2] [3] and distribution of workload in shared memory systems. [4]
Most modern CPUs are so fast that for most program workloads, the bottleneck is the locality of reference of memory accesses and the efficiency of the caching and memory transfer between different levels of the hierarchy [citation needed]. As a result, the CPU spends much of its time idling, waiting for memory I/O to complete.
"Time is of the essence" is a term used in contract law in England and Wales (a legal jurisdiction within the United Kingdom), Canada, Australia, New Zealand, other Commonwealth countries and the United States, expressing "the need for timely completion", [1] i.e. indicating that one or more parties to the agreement must perform by the time to which the parties have agreed if a delay will ...
LIRS (Low Inter-reference Recency Set) is a page replacement algorithm with an improved performance over LRU (Least Recently Used) and many other newer replacement algorithms. [1] This is achieved by using "reuse distance" [ 2 ] as the locality metric for dynamically ranking accessed pages to make a replacement decision.
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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] NUMA is beneficial for workloads with high memory locality of reference and low lock contention , because a processor may operate on a subset of memory mostly or entirely within its ...