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• W2267155642 abstract "A number of interacting trends in operating system structure, processor architecture, and memory systems are increasing both the rate of translation lookaside buffer (TLB) misses and the cost of servicing a TLB miss. This thesis presents two novel software schemes, implemented under Mach 3.0, to decrease both the number and the cost of kernel TLB misses (i.e., misses on kernel data structures, including user page tables). The first scheme is a new use of prefetching for TLB entries on the IPC path, and the second scheme is a new use of software caching of TLB entries for hierarchical page table organizations. For a range of applications, prefetching decreases the number of kernel TLB misses by 40% to 60%, and caching decreases TLB penalties by providing a fast path for over 90% of the misses. Our caching scheme also decreases the number of cascaded TLB traps due to the page table hierarchy, reducing the number of kernel TLB misses by 20% to 40%. For these applications, TLB penalties range from 1% to 5% of application runtime; our schemes are very effective in reducing kernel TLB penalties, improving application performance by up to 3.5%. We also demonstrated the impact of increasing the number of client/server processes, and increasing the data accessed by a process, on TLB miss handling times. For these synthetic benchmarks, our schemes, especially the integrated scheme with both prefetching and caching, perform very well improving runtimes for fine-grained benchmarks by up to 10%. Processor speeds continue to increase relative to memory speeds; a simple analytical model indicates that our schemes should be even more effective in improving application performance on future architectures. Thesis Supervisor: William E. Weihl Title: Associate Professor of Computer Science and Engineering Thesis Supervisor: M. Frans Kaashoek Title: Assistant Professor of Computer Science and Engineering" @default.
• W2267155642 created "2016-06-24" @default.
• W2267155642 creator A5087263986 @default.
• W2267155642 date "1995-01-01" @default.
• W2267155642 modified "2023-09-27" @default.
• W2267155642 title "Software management techniques for translation lookaside buffers" @default.
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