Ashok Malhotra, Kenneth J. Perry (auth.), Antonio Albano,'s Persistent Object Systems: Proceedings of the Fifth PDF

By Ashok Malhotra, Kenneth J. Perry (auth.), Antonio Albano, Ron Morrison BSc, MSc, PhD, CEng (eds.)

ISBN-10: 1447132092

ISBN-13: 9781447132097

ISBN-10: 3540198008

ISBN-13: 9783540198000

Jointly released with the British laptop Society

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Extra info for Persistent Object Systems: Proceedings of the Fifth International Workshop on Persistent Object Systems, San Miniato (Pisa), Italy, 1–4 September 1992

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Ten from the buffer, the corresponding page is access protected so that subsequent changes can be detected, and a new copy made. We believe that this strategy will be good for the performance of both long and short transactions. Writing out changes prematurely may increase disk bandwidth requirements for long transactions, but is likely to increase overall performance by decreasing commit latency--blocks that are written prematurely (and which do not change again before the transaction commits) need not be written out commit time.

28J Jean-Loup Baer and Gary R. Sager. Dynamic improvement of locality in virtual memory systems. IEEE Transactions on Software Engineering, SE-2(1):54-62, March 1976. [29] Vincent Cate and Thomas Gross. Combining the concepts of compression and caching for a two-level file system. In Fourth International Conference on A rchitectural Support for Programming Languages and Operating Systems (ASPLOS IV;, pages 200--209, Santa Clara, California, April 1991. [30] Michael Burrows, Charles Jerian, Butler Lampson, and Timothy Mann.

If, for example, nonvolatile RAM is used for checkpointing, checkpointing writes may become much cheaper, and applications may exploit that by checkpointing more frequently. In that case, the time spent diffing pages may go up significantly, and fine-grained dirty bit schemes will become correspondingly more attractive. 2 Limiting the Space Costs of Diffing Besides the time cost of page diffing, there is a space cost, namely the cost of keeping clean versions of modified pages. For short transactions, where checkpointing writes are the limiting factor, this is not generally a problem-the problem is the time required to commit a moderate number of dirty pages to disk, not the storage required for a large number of dirty pages.

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Persistent Object Systems: Proceedings of the Fifth International Workshop on Persistent Object Systems, San Miniato (Pisa), Italy, 1–4 September 1992 by Ashok Malhotra, Kenneth J. Perry (auth.), Antonio Albano, Ron Morrison BSc, MSc, PhD, CEng (eds.)


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