Operating Systems - Thrashing - Working Set Model & Prevention
When a process's working set size grows beyond its allocated frames, which of the following sequences correctly describes the system behavior leading to thrashing?
When a process's working set size grows beyond its allocated frames, which of the following sequences correctly describes the system behavior leading to thrashing?
easy🧾 Trace Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify what happens when working set exceeds frames
Page faults increase because needed pages are not in memory.Step 2: Understand system response
Frequent page replacements occur to bring in missing pages.Step 3: Recognize CPU impact
CPU spends excessive time handling page faults instead of executing processes.Final Answer:
Option C -> Option CQuick Check:
More faults cause paging overhead, leading to thrashing [OK]
Quick Trick: More page faults cause thrashing via paging overhead [OK]
Common Mistakes:
MISTAKES- Assuming decreased page faults cause thrashing
- Thinking stable page faults still cause thrashing
- Believing thrashing occurs when page faults are eliminated
Trap Explanation:
PITFALL- Decreased or stable faults do not cause thrashing, but increased faults do
Interviewer Note:
CONTEXT- Tests knowledge of system behavior when working set exceeds allocated frames
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