intermediate · resources
CPU Is at 100%
CPU on your service is pegged at 100%. What do you investigate?
Practical scenario
A checkout service is at 97–100% CPU across all 12 instances. Latency p99 has roughly doubled. Traffic is within 5% of last week.
What it tests
- • Whether the candidate checks that CPU is actually the constraint
- • Knowledge of profiling as the tool for this question
- • Awareness that the runtime, not the application, is often the consumer