Operating Systems - Context Switch - Cost & Causes
If a system designer wants to reduce context switch overhead in a heavily multi-threaded application, which optimization is most effective?
If a system designer wants to reduce context switch overhead in a heavily multi-threaded application, which optimization is most effective?
hard🎤 Interviewer Follow-up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand context switch overhead in multi-threading
Reducing involuntary context switches reduces overhead; cooperative multitasking achieves this by explicit yielding.Step 2: Evaluate other options
Thread-local storage helps with data management but does not reduce switch overhead. Increasing context switch frequency increases overhead. Disabling preemption risks starvation and poor responsiveness.Final Answer:
Option C -> Option CQuick Check:
Cooperative multitasking reduces involuntary context switches [OK]
Quick Trick: Explicit yielding reduces involuntary context switches [OK]
Common Mistakes:
MISTAKES- Confusing thread-local storage with switch overhead
- Thinking more frequent switches improve performance
- Believing disabling preemption is safe
Trap Explanation:
PITFALL- Candidates often confuse data management with switch overhead or ignore risks of disabling preemption.
Interviewer Note:
CONTEXT- Tests deep understanding of context switch overhead reduction strategies.
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