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Objective 5.1

PCDE

Collecting performance information in Google Cloud

Objective 5.1 sits in Optimizing performance and cost, which carries 12% of the Cloud DevOps Engineer exam. The questions below are original, written from the official objective title above, and each explanation cites the Google Cloud page it rests on.

Objective title verbatim from the official objectives. Google Cloud exam page ↗

A worked example

Shown solved, with the whole explanation open: this is what every question here carries.

5-1Optimizing performance and cost

An engineer sees a function whose wall time far exceeds its CPU time. What does that difference indicate?

The function is CPU intensive and worth optimizingThat reading applies when the two figures sit close together, not when they diverge.
The profile was collected at a single instantInstantaneous collection applies to heap usage and thread profiles, not to timing ones.
The code spends time waiting, perhaps on a bottleneckCorrect · your answerCorrect: the gap is idle time by definition.
The sampling agent missed part of the intervalSampling gaps are not what produces the difference, as both figures come from one profile.

Correct.

Concept

Elapsed time and busy time answer different questions. The gap between them is exactly the time nothing was being computed, which is where locks, queues and remote calls hide.

Why C

One measure can never fall below the other, and a large separation between them means the block sits idle for much of its duration. A substantial gap points at a resource constraint.

Source

If the wall-clock time is longer than the CPU time, then that indicates the code spends time waiting. When the difference is substantial, your application might have a resource bottleneck.

Google Cloud: Profiling concepts, checked August 2026
#cloud-profiler#latency#performance

Now you: objective 5.1 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

5-1Optimizing performance and cost

A team wants to know which allocations are loading the garbage collector. Which profile type answers that?

Sample question 2 of 3

5-1Optimizing performance and cost

A team's job allocates one MiB, waits, frees it, then repeats, ten times across the ten seconds a profile covers. What does allocated heap report?

Sample question 3 of 3

5-1Optimizing performance and cost

A team deploys the same application to a second zone and a new deployment appears in Profiler. Which fields define one?

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

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