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Disk caching in large database and timeshared systems

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2 Author(s)
Zivkov, B.T. ; Dept. of Comput. Sci., California Univ., Berkeley, CA, USA ; Smith, A.J.

We present the results of a variety of trace-driven simulations of disk cache designs using traces from a variety of mainframe timesharing and database systems in production use. We compute miss ratios, run lengths, traffic ratios, cache residency times, degree of memory pollution and other statistics for a variety of designs, varying lock size, prefetching algorithm and write algorithm. We find that for this workload, sequential prefetching produces a significant (about 20%) but still limited improvement in the miss ratio, even using a powerful technique for detecting sequentiality. Copy-back writing decreased write traffic relative to write-through by more than 50%; periodic flushing of the dirty blocks increased write traffic only slightly compared to pure write-back, and then only for large cache sizes. Write-allocate had little effect compared to no-write-allocate. Block sizes of over a track don't appear to be useful. Limiting cache occupancy by a single process or transaction appears to have little effect. This study is unique in the variety and quality of the data used in the studies

Published in:

Modeling, Analysis, and Simulation of Computer and Telecommunication Systems, 1997. MASCOTS '97., Proceedings Fifth International Symposium on

Date of Conference:

12-15 Jan 1997