hard20 pts · first answer countslinux-performanceebpf

Slow requests, idle CPU

p99 latency of a service is 2 s, but CPU flame graphs show nothing unusual and CPU usage is 15%. Which analysis is most likely to find where the time goes?

A.Collect more on-CPU flame graphs at a higher sample rateB.Increase the number of CPU coresC.Off-CPU analysis (for example eBPF offcputime) to see where threads block on locks, I/O or the networkD.Check the load average once a minute

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Slow requests, idle CPU

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