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oai:www.ideals.illinois.edu:2142/46807 2023-07-11 col_2142_5131 col_2142_10761 com_2142_5130 com_2142_10755 com_2142_234

Sha, Lui R. Sha, Lui R. Caccamo, Marco Abdelzaher, Tarek F. Pellizzoni, Rodolfo Yun, Heechul 2014-01-16T18:16:43Z 2014-01-16T18:16:43Z 2016-01-16T11:00:39Z 2013-12 2014-01-16T18:16:43Z 2013-12 The main goal of a real-time operating system (RTOS) is to provide foundations for guaranteeing deterministic or probabilistic timing requirements of real-time systems. In that regard, scheduling the CPU time has been the core aspect of any RTOS, as it directly contributes to satisfying timing requirements of real-time systems. In recent years, however, the emergence of multicore processor architecture and the growing number of battery powered devices make other aspects---such as contention in concurrently shared hardware resources and power consumption---also critical in providing required real-time performance. Management of concurrently shared hardware resources---such as shared caches, DRAM controllers, DRAM modules, hardware prefetchers---is important because contention in the shared resources can significantly degrade applications' execution times. Power (energy) management is also important because power-saving techniques typically have significant performance implications. This dissertation describes new OS level mechanisms and policies that control the shared hardware resources in commodity processors in ways that improve performance isolation and reduce energy consumption of real-time systems. These techniques enhance a RTOS's resource management capability so that it can be flexibly tailored to meet challenging real-time requirements without significantly compromising overall performance or wasting energy. Contributions of this dissertation include the following: (1) The design, prototype implementation, and performance evaluation of an efficient fine-grained memory bandwidth reservation system called MemGuard that improves performance isolation of multicore based real-time systems. (2) The design, model validation, and performance evaluation of the MultiDVFS scheme that jointly optimizes CPU and memory frequencies/voltages for real-time systems. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-07-29T14:07:59Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Yun_Heechul.pdf: 1766279 bytes, checksum: 0bc1bf413e359f5281237f55895eeb3d (MD5) Made available in DSpace on 2014-01-16T18:16:43Z (GMT). No. of bitstreams: 2 Heechul_Yun.pdf: 1766279 bytes, checksum: 0bc1bf413e359f5281237f55895eeb3d (MD5) license.txt: 4060 bytes, checksum: b5a9accda3483cd66f663e6a0e6008dc (MD5) Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Seth Robbins (robbins.sd@gmail.com) on 2014-01-16T18:19:38Z Item is restricted until 2016-01-16T18:19:34Z Restriction data tranferred 2014-07-01T11:35:33-05:00 Original Data Group with Access UIUC Users [automated] Release Date: 2016-01-16 12:19:34 UTC Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 46826 on 2016-01-16T11:00:39Z. http://hdl.handle.net/2142/46807 en Copyright 2013 Heechul Yun Real-Time Operating System Resource Management Reservation Dynamic voltage and frequency scaling (DVFS) Isolation Power Management Operating system level resource management for real-time systems text Computer Science 1434 Computer Science 0112 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Computer Science -UIUC 10KS0112PHD