Learn Java Profiling – Module 3 Lesson 1 – Quiz

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Question 1 of 5

1. Question

What is the difference between wall-clock time and CPU time?

CPU time includes time spent waiting on I/O, while wall-clock time does not
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Wall-clock time is the total elapsed time from start to finish, while CPU time counts only the time the processor spends actively executing the method's instructions
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Wall-clock time only applies to CPU-bound methods, while CPU time only applies to I/O-bound methods
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They measure the same duration, just expressed in different units
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Question 2 of 5

2. Question

What characterizes a method with high inclusive time but low exclusive time?

The method is CPU-bound and is doing expensive computation itself
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The method has been invoked an unusually large number of times
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The method is a pass-through that delegates most of its work to the methods it calls
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The method is waiting on an external resource
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Question 3 of 5

3. Question

How does JProfiler label inclusive time and exclusive time?

Inclusive time as "Total Time" and exclusive time as "Self Time"
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Inclusive time as "Self Time" and exclusive time as "Total Time"
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Inclusive time as "Cumulative Time" and exclusive time as "Own Time"
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Inclusive time as "Elapsed Time" and exclusive time as "CPU Time"
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Question 4 of 5

4. Question

Which statements about the Call Tree are true? (select all that apply)

It aggregates all invocations of a method into cumulative totals rather than showing individual call timelines
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It only displays methods that have a non-zero exclusive time
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It is typically sorted by inclusive time, so the most expensive call path appears first at each level
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It switches automatically between wall-clock and CPU time depending on which thread state has the most samples
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Question 5 of 5

5. Question

When profiling the slow /campaigns/report endpoint, what did the Call Tree reveal about the fibonacci() method?

Each invocation was slow due to expensive computation inside fibonacci() itself
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The method was blocked waiting for a database connection
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The method had high exclusive time but low inclusive time
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The number of invocations roughly doubled at each recursion depth, producing an exponential number of cheap calls
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Learn Java Profiling – Module 3 Lesson 1 – Quiz

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