Throughput and scheduling — multiprogramming effect: Which statement best describes a typical advantage of multiprogramming systems compared to single-program systems?

Introduction / Context:Multiprogramming allows multiple jobs to reside in memory at once, so the CPU can switch to another job when one blocks for I O. This improves overall throughput and resource utilization compared to running a single job at a time.

Given Data / Assumptions:

• Jobs may be CPU bound or I O bound.
• Context switching overhead exists but is outweighed by reduced idle time.
• We compare aggregate performance (throughput), not individual job runtime.

Concept / Approach:

By overlapping CPU time of one job with I O wait of another, multiprogramming decreases total idle time. This means more jobs complete within a fixed interval. Individual jobs may not finish faster, but the system completes more work overall, increasing throughput.

Step-by-Step Solution:

Verification / Alternative check:

Queueing theory and empirical OS measurements show throughput improvements under multiprogramming, especially with mixed workloads.

Why Other Options Are Wrong:

• Easier to develop: false; multiprogramming is more complex.
• Execute each job faster: often not true; context switching can slow individual jobs slightly.
• Only on mainframes: false; all modern systems use multiprogramming.
• None of the above: incorrect because one option is correct.

Common Pitfalls:

Confusing response time improvements for short jobs with universal speedups; throughput gains do not guarantee faster completion for every job.

Final Answer:

execute more jobs in the same time period