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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. Temporal locality refers to the reuse of specific data ...
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.
The California Regulatory Notice Register (Notice Register or Z Register) contains notices of proposed regulatory actions by California state agencies to adopt, amend, or repeal regulations contained in the California Code of Regulations (CCR). It is similar to the role of the Federal Register.
As it does not contain enforcement provisions of its own, CalOPPA is expected to be enforced through California's Unfair Competition Law (UCL), [7] which prohibits unlawful, unfair, or fraudulent business acts or practices. UCL may be enforced for violations of CalOPPA by government officials seeking civil penalties or equitable relief, or by ...
The most efficient caching algorithm would be to discard information which would not be needed for the longest time; this is known as Bélády's optimal algorithm, optimal replacement policy, or the clairvoyant algorithm. Since it is generally impossible to predict how far in the future information will be needed, this is unfeasible in practice.
[1] [2] The novelty of PGAS is that the portions of the shared memory space may have an affinity for a particular process, thereby exploiting locality of reference in order to improve performance. A PGAS memory model is featured in various parallel programming languages and libraries, including: Coarray Fortran , Unified Parallel C , Split-C ...
If it is not, the system is in an incoherent state: it contains two different records of the same memory block which both claim to be up-to-date. Incoherent caches: The caches have different values of a single address location. In computer architecture, cache coherence is the uniformity of shared resource data that is stored in multiple local ...