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Exam Review

Exam Review. Sarah Diesburg Operating Systems CS 3430. Coverage. Sessions 14-23, exercises 5-8 and project 2 Multiple choice, short answer, problem solving. Monitors, Condition Variables, and Readers-Writers. Definitions Monitor Lock Condition variable.

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Exam Review

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  1. Exam Review Sarah Diesburg Operating Systems CS 3430

  2. Coverage • Sessions 14-23, exercises 5-8 and project 2 • Multiple choice, short answer, problem solving

  3. Monitors, Condition Variables, and Readers-Writers • Definitions • Monitor • Lock • Condition variable

  4. Monitors, Condition Variables, and Readers-Writers • Short answers • Hoare vs. Mesa monitors • Correct a broken solution (readers-writers) • Semaphore vs. monitors

  5. Deadlocks • Definitions • Deadlock • Starvation • Checkpointing

  6. Deadlocks • Short answers • Correct a broken solution (dining philosophers) • Four conditions for deadlocks • Deadlock prevention techniques • Banker’s algorithm

  7. Memory Protection • Definitions • Interprocess communication • System call

  8. Memory Protection • Short answers • Hardware-supported mechanisms • Software-supported mechanisms • Steps to switch between kernel and user modes • Context switching between processes vs. threads

  9. Address Translation • Definitions • Segment • External fragmentation • Internal fragmentation • Translation lookaside buffers (abbreviated TLB)

  10. Address Translation • Short answers • Base-and-bound translation • Segmentation-based translation • Paging-based translation • Segmented-paging translation • Paged page tables

  11. Caching and TLBs • Definition • Caching • Temporal locality • Spatial locality • Cache pollution • Translation lookaside buffer

  12. Caching and TLBs • Short answers • Design issues of caching • Four types of cache misses • Ways to perform TLB lookups • Write-through vs. write-back policies • Effective access time

  13. Demand Paged Virtual Memory • Definitions • Demand paging • Page fault • Belady’s anomaly • Thrashing • Working set

  14. Demand Paged Virtual Memory • Short answers • Steps to carry out a page fault • Page replacement policies • 4 state bits for a page table entry

  15. Device Management • Definitions • Polling/interrupts/DMA/double buffering • Device controller/device driver • Memory-mapped I/O • Disk-related terms • Disk measurement metrics

  16. Device Management • Short answers • Categories of I/O devices • Ways to access a device • Disk arm scheduling policies • Latency and bandwidth computations

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