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Questions and Answers
This scheduling policy is also known as ______ or a strict queuing scheme.
This scheduling policy is also known as ______ or a strict queuing scheme.
first-in-first-out
The ______ process is selected for running when the currently running process ceases to execute.
The ______ process is selected for running when the currently running process ceases to execute.
process that has been in the ready queue the longest
This scheduling policy tends to ______ processor-bound processes over I/O-bound processes.
This scheduling policy tends to ______ processor-bound processes over I/O-bound processes.
favor
This scheduling policy is particularly effective in a ______ time-sharing system or transaction processing system.
This scheduling policy is particularly effective in a ______ time-sharing system or transaction processing system.
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The principal design issue in this scheduling policy is the length of the ______ to be used.
The principal design issue in this scheduling policy is the length of the ______ to be used.
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This scheduling policy uses ______ based on a clock.
This scheduling policy uses ______ based on a clock.
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Each process is given a ______ of time before being preempted.
Each process is given a ______ of time before being preempted.
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This scheduling policy is also known as ______ because each process is given a slice of time.
This scheduling policy is also known as ______ because each process is given a slice of time.
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One drawback of this scheduling policy is its relative ______ of processor-bound and I/O-bound processes.
One drawback of this scheduling policy is its relative ______ of processor-bound and I/O-bound processes.
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This scheduling policy performs much better for ______ processes than short ones.
This scheduling policy performs much better for ______ processes than short ones.
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Study Notes
Process Scheduling
- The size of the time quantum can affect the response time of a process.
- If the time quantum is greater than the typical interaction time, the process may finish before being preempted.
- If the time quantum is less than the typical interaction time, other processes may run before the original process is completed.
Priority Queuing
- A priority queuing system assigns a priority to each process based on its priority level.
- The process with the highest priority is executed first.
- Priority queuing can be implemented using a Round Robin scheduler.
Scheduling Policies
- First-Come-First-Served (FCFS) is a simple scheduling policy where each process is executed in the order it arrives.
- FCFS can result in high response times for short processes and favors processor-bound processes over I/O-bound processes.
- Shortest Process Next (SPN) schedules the process with the shortest burst time next.
- Shortest Remaining Time (SRT) schedules the process with the shortest remaining time next.
- Highest Response Ratio Next (HRRN) schedules the process with the highest response ratio next.
- Feedback scheduling is based on the feedback from the system.
- Round Robin (RR) uses time slicing to allocate a fixed time quantum to each process.
- RR is effective in time-sharing systems and general-purpose systems.
- The principal design issue in RR is the length of the time quantum.
Characteristics of Scheduling Policies
- FCFS has low overhead but may have high response times for short processes.
- SPN, SRT, and HRRN may have high overhead due to context switching.
- RR provides good response times but may have high overhead due to context switching.
- FCFS, SPN, SRT, and HRRN may favor I/O-bound processes or processor-bound processes.
- RR treats all processes fairly but may favor I/O-bound processes.
- Starvation is possible in SPN, SRT, and HRRN, but not in FCFS or RR.
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Description
This quiz is about process scheduling in operating systems, focusing on time quantum, response time, and interaction completion. It requires understanding of process allocation and time quanta.
