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System Design · interview question

What is the healthiest performance judgment around choosing the model?

Multiple choiceHardchapter-15-curatedpremiumsystem-designchoosing-the-model
python
def choose_execution_model(io_heavy: bool, cpu_heavy: bool) -> str:
    if io_heavy:
        return "asyncio or threads"
    if cpu_heavy:
        return "processes"
    return "simple synchronous code"
Choose one answer
Answer and explanation

Correct answer

B. Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.

Why

Premature optimization is usually weaker than targeted optimization backed by measurement.

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