By Jeffrey Scott Vitter
Information units in huge functions are frequently too mammoth to slot thoroughly contained in the computer's inner reminiscence. The ensuing input/output communique (or I/O) among quickly inner reminiscence and slower exterior reminiscence (such as disks) could be a significant functionality bottleneck. Algorithms and information constructions for exterior reminiscence surveys the cutting-edge within the layout and research of exterior reminiscence (or EM) algorithms and knowledge constructions, the place the target is to use locality and parallelism in an effort to decrease the I/O charges. a number of EM paradigms are thought of for fixing batched and on-line difficulties successfully in exterior reminiscence. Algorithms and knowledge constructions for exterior reminiscence describes numerous important paradigms for the layout and implementation of effective EM algorithms and knowledge constructions. the matter domain names thought of comprise sorting, permuting, FFT, clinical computing, computational geometry, graphs, databases, geographic details structures, and textual content and string processing. Algorithms and knowledge buildings for exterior reminiscence is a useful reference for anyone attracted to, or carrying out learn within the layout, research, and implementation of algorithms and information constructions.
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Extra resources for Algorithms and Data Structures for External Memory (Foundations and Trends(R) in Theoretical Computer Science)
They developed matching upper and lower I/O bounds for all parameter values for a host of problems. Since the PDM model can be thought of as a more restrictive (and more realistic) version of Aggarwal and Vitter’s model, their lower bounds apply as well to PDM. 4, we discuss a simulation technique due to Sanders et al. ; the Aggarwal–Vitter model can be simulated probabilistically by PDM with only a constant factor more I/Os, thus making the two models theoretically equivalent in the randomized sense.
An advantage of using striping for output operations is that it facilitates the maintenance of parity information for error correction and recovery, which is a big concern in RAID systems. ) In practice, sorting via disk striping can be more eﬃcient than complicated techniques that utilize independent disks, especially when D is small, since the extra factor (log m)/ log(m/D) of I/Os due to disk striping may be less than the algorithmic and system overhead of using the disks independently .
If the blocks in Σ are distinct, we call the output scheduling problem write-once scheduling. If some blocks are repeated in Σ , we call the problem write-many scheduling. If we are able to keep a block in an output buﬀer long enough until it is written again by the application program, then we need to output the block at most once rather than twice. The output scheduling problem is generally easy to solve optimally. 4, we exploit a duality  of the output scheduling problems of write-once scheduling, write-many scheduling, and distribution in order to derive optimal algorithms for the dual prefetch problems of read-once scheduling, read-many scheduling, and merging.