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Download PDF by Michael C. Curtis, Victoria J. D. Sivess (auth.), Dimitris: Ada: The Choice for '92: Ada-Europe International Conference

By Michael C. Curtis, Victoria J. D. Sivess (auth.), Dimitris Christodoulakis (eds.)

ISBN-10: 354054092X

ISBN-13: 9783540540922

The annual Ada-Europe convention is an important occasion in Europe for the advertising and improvement of the Ada programming language and of Ada-based software program engineering technique. a complete of 25 papers have been chosen for the 1991 convention. Technical excellence and originality have been the critical choice standards, yet clarity and relevance to the convention subject have been additionally taken into consideration. The papers have been equipped into 8 sections, on language concerns, metrics, concurrency and parallelism in Ada, non-stop structures, environments and instruments, distribution, faces of reuse, and venture reports.

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Additional info for Ada: The Choice for '92: Ada-Europe International Conference Athens, Greece, May 13–17, 1991 Proceedings

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When a dirty page is evicted from the main memory, TAC writes it to both hard disk and SSD simultaneously. TAC adopts a write-through policy to deal with dirty pages, and do not reduce the total number of write operations to disk. Using flash memory as extension cache is also discussed in [7], which proposes two novel algorithms for flash cache management in order to improve the transaction throughput and shorten the recovery time. The authors adopt FIFO replacement policy to manage the data pages cached in SSD, when the SSD receives a write request, it will be done sequentially through an append-only fashion.

This is because that write operation of flash memory is an order of magnitude slower than read operation on the flash memory, and the performance benefit of reserving dirty pages tends to be higher than that of reserving clean pages. Considering the asymmetric read and write operation costs of flash disks in terms of performance, we split the buffer into two LRU queues, say QC and QD. QC is used to manage the clean pages, QD is responsible for the dirty pages. The size ratio of QC and QD is given by Formula 1: length (Qc ) Cr = ∗λ = ω length (Qd ) C r + C w (1) Where Cr and C w stand for the time cost of a read and a write operation respective- ly.

It is good at deleting redundant data to significantly save storage space and network bandwidth, thus minimizing power consumption and the cost. It is not always possible to keep all of fingerprints of deduplication system in memory because of the uncontrollable growth of data. When storing them in the disk, disk bottleneck may become the critical problem. In order to alleviate disk bottleneck, some researchers show interests in flash memory. Compared to HDD, SSD performs better in many aspects, such as random access speed, low power consumption and high reliability.

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Ada: The Choice for '92: Ada-Europe International Conference Athens, Greece, May 13–17, 1991 Proceedings by Michael C. Curtis, Victoria J. D. Sivess (auth.), Dimitris Christodoulakis (eds.)


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