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Data Locality in Parallel Algorithms
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Data Locality in Cache
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.
Temporal Locality
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.
Spatial Locality
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.
Loop Nesting and Data Locality
Nested loops can be restructured (loop interchange, tiling, etc.) to enhance spatial or temporal locality, effectively minimizing cache misses during computational tasks.
Data Locality Principle: Overview
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.
Data Locality in Distributed Systems
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.
NUMA (Non-Uniform Memory Access) Considerations
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.
Impact of Data Locality on Performance
Good data locality minimizes cache misses and memory access time, leading to better computational performance and less wasted CPU cycles.
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