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Challenges and Opportunities for OS in the Multi-Core Era

Challenges and Opportunities for OS in the Multi-Core Era. Yuanyuan (YY) Zhou University of Illinois at Urbana-Champaign http://opera.cs.uiuc.edu/. Real Life Analogy. OS--- Parent Core --- Kid People say

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Challenges and Opportunities for OS in the Multi-Core Era

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  1. Challenges and Opportunities for OS in the Multi-Core Era Yuanyuan (YY) Zhou University of Illinois at Urbana-Champaign http://opera.cs.uiuc.edu/ UIUC-CS

  2. Real Life Analogy • OS--- Parent • Core --- Kid • People say • Going from one kid to two is a quality change for the parent, not just a quantity change • And so is multi-core for OS! UIUC-CS

  3. Challenges • “Toy” competition & sharing • How to allocate resources (L2 cache?) • How to improve resource utilization • Scalability --- how to handle 100 kids? • How to avoid become the bottleneck • How to improve the parallelism of OS (use TMM for OS?) • Scheduling • Memory and IO become a bottleneck • Maybe memory-centric scheduling? UIUC-CS

  4. Opportunities • “Task offloading” • Offloading tasks to idle cores • Example: • Have CPU resources to analyze patterns to make better decision • Run the hyper-visor on a different core • “Peer-pressure” & “tattletale” • Use idle cores to monitor execution on the other cores for security and reliability • “Backup solution” • When one core fails, some other core can take over • Run critical applications on two cores redundantly UIUC-CS

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