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Data Locality in Parallel Algorithms

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Data Locality in Cache

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Exploiting data locality in cache involves organizing memory and cache hierarchies to optimize the probability that required data will be found in the fastest accessible storage layer.

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Temporal Locality

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Temporal locality is a type of data locality that exploits the principle where recently accessed data is likely to be accessed again in the near future.

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Spatial Locality

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Spatial locality refers to the use of data elements that are closely located in memory being likely accessed close together in time during program execution.

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Loop Nesting and Data Locality

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Nested loops can be restructured (loop interchange, tiling, etc.) to enhance spatial or temporal locality, effectively minimizing cache misses during computational tasks.

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Data Locality Principle: Overview

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The data locality principle refers to the practice of managing data so that it is close to the processing operations, reducing latency and improving access speeds.

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Data Locality in Distributed Systems

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In distributed systems, data locality is about placing computations close to where the data is stored to limit the amount of data transfer over the network, thus reducing latency.

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NUMA (Non-Uniform Memory Access) Considerations

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NUMA architectures require careful attention to data locality because memory access times can vary depending on the memory bank location in relation to the processor accessing it.

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Impact of Data Locality on Performance

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Good data locality minimizes cache misses and memory access time, leading to better computational performance and less wasted CPU cycles.

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