Performance Metrics – Real-time Systems MCQs

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1. What is the main purpose of performance metrics in real-time systems?
(A) To perform batch processing only
(B) To reduce CPU idle exclusively
(C) To evaluate how efficiently and predictably the system meets its objectives
(D) To ignore deadlines

2. Which metric measures the total time a task takes from release to completion?
(A) Response time
(B) CPU idle exclusively
(C) Disk batch-only time
(D) Memory-only execution

3. Which metric indicates how often a system meets task deadlines?
(A) Deadline miss ratio
(B) CPU idle exclusively
(C) Disk batch-only throughput
(D) Memory-only efficiency

4. Throughput in real-time systems measures:
(A) Disk batch-only operations
(B) CPU idle exclusively
(C) Number of tasks completed per unit time
(D) Memory-only tasks

5. CPU utilization is a performance metric that:
(A) Memory-only usage
(B) CPU idle exclusively
(C) Disk batch-only execution
(D) Measures the fraction of time the CPU is actively executing tasks

6. Turnaround time is defined as:
(A) The total time taken from task submission to task completion
(B) CPU idle exclusively
(C) Disk batch-only processing time
(D) Memory-only execution

7. Waiting time measures:
(A) Memory-only queuing
(B) CPU idle exclusively
(C) Disk batch-only delay
(D) The time a task spends in the ready queue before execution

8. Jitter in real-time systems refers to:
(A) Disk batch-only timing variation
(B) CPU idle exclusively
(C) Variation in task response times or periodic task arrivals
(D) Memory-only delay

9. Latency is defined as:
(A) CPU idle exclusively
(B) Time delay between an event and the system’s response
(C) Disk batch-only delay
(D) Memory-only latency

10. Load factor or system utilization helps in:
(A) CPU idle exclusively
(B) Determining if the system can handle all tasks without deadline violations
(C) Disk batch-only utilization
(D) Memory-only load

11. Quality of Service (QoS) metrics in real-time systems include:
(A) Disk batch-only safety
(B) CPU idle exclusively
(C) Response time, throughput, reliability, and availability
(D) Memory-only performance

12. Which metric evaluates the system’s ability to recover from failures?
(A) Fault recovery time
(B) CPU idle exclusively
(C) Disk batch-only recovery
(D) Memory-only restoration

13. Resource utilization metrics measure:
(A) How effectively CPU, memory, and I/O are used
(B) CPU idle exclusively
(C) Disk batch-only efficiency
(D) Memory-only usage

14. Deadline adherence measures:
(A) Percentage of tasks completing within their deadlines
(B) CPU idle exclusively
(C) Disk batch-only timing
(D) Memory-only adherence

15. Blocking time in real-time systems refers to:
(A) Memory-only wait
(B) CPU idle exclusively
(C) Disk batch-only blocking
(D) Time a task is delayed due to resource unavailability or priority inversion

16. Performance metrics are essential for:
(A) System design, scheduling analysis, and optimization
(B) CPU idle exclusively
(C) Disk batch-only evaluation
(D) Memory-only monitoring

17. Worst-case execution time (WCET) is used in performance evaluation to:
(A) CPU idle exclusively
(B) Ensure tasks can complete within deadlines under worst-case conditions
(C) Disk batch-only execution
(D) Memory-only worst-case

18. Average-case performance metrics help in:
(A) Memory-only monitoring
(B) CPU idle exclusively
(C) Disk batch-only evaluation
(D) Understanding typical system behavior under normal load

19. Performance analysis helps in identifying:
(A) CPU idle exclusively
(B) Bottlenecks, inefficiencies, and areas for improvement
(C) Disk batch-only tasks
(D) Memory-only inefficiencies

20. The main advantage of using performance metrics in real-time systems is:
(A) CPU idle exclusively
(B) Ensuring predictable, reliable, and efficient task execution
(C) Disk batch-only optimization
(D) Memory-only efficiency