Load Testing · Senior · Question 18 of 76
An I/O-bound service autoscales on CPU. What does a load test likely show?
- 1It scales out too early, because I/O work uses a lot of CPU
- 2It doesn't scale out, though latency is high, as CPU stays low
- 3It works perfectly, since CPU always tracks load
Show the answer
Correct answer: It doesn't scale out, though latency is high, as CPU stays low
Explanation
Scaling signals must match the bottleneck. Use request rate, queue length or latency for services that mostly wait on I/O.