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Demonstrations of biolatpcts.py, the Linux eBPF/bcc version. This traces block I/O and uses layered percpu arrays to bucket the completion latencies. Latency percentiles are calculated periodically from the buckets. # ./biolatpcts.py p50=595.0us p75=685.0us p90=1500.0us p99=2500.0us p50=55.0us p75=95.0us p90=305.0us p99=2500.0us p50=385.0us p75=655.0us p90=1500.0us p99=2500.0us [...] The latency is measured from I/O request to the device, to the device completion. This excludes latency spent queued in the OS. This is a simplified example to demonstrate the calculation of latency percentiles. See tools/biolatpcts.py for the full utility.