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CSC 301 - Exam 2 (Chapter 5) Study Guide correctly answered to pass
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CSC 301 - Exam 2 (Chapter 5) Study Guide correctly answered to pass
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CSC 301 - Exam 2 (Chapter 5) StudyGuide correctly answered to pass
Distinguish between coarse-grained & fine-grained multithreading - correct answer ✔✔- Coarse-grained
multithreading allows thread to run on processor until long-latency event, such as waiting for memory,
to occur.
- When long latency event does occur, processor switches to another thread.
- Fine-grained multithreading switches between threads at much finer granularity, such as between
instructions.
Explain concept of CPU-I/O burst cycle - correct answer ✔✔- lifecycle of process can be considered to
consist of number of bursts belonging to two different states
- All processes consist of CPU cycles & I/O operations.
- Therefore, process can be modeled as switching between bursts of CPU execution & I/O wait.
What role does dispatcher play in CPU scheduling? - correct answer ✔✔- dispatcher gives control of CPU
to process selected by short-term scheduler
- to perform this task, context switch, switch to user mode, & jump to proper location in user program
are all required
- dispatch should be made as fast as possible
- time lost to dispatcher is termed dispatch latency.
Explain difference between response time & turnaround time. These times are both used to measure
effectiveness of scheduling schemes. - correct answer ✔✔- Turnaround time is sum of periods that
process is spent waiting to get into memory, waiting in ready queue, executing on 11 CPU, & doing I/O
- Turnaround time essentially measures amount of time it takes to execute process
- Response time, on other hand, is measure of time that elapses between request & first response
produced.
What effect does size of time quantum have on performance of an RR algorithm? - correct answer ✔✔-
At one extreme, if time quantum is extremely large, RR policy is same as FCFS policy
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