1Demonstrations of biolatpcts.py, the Linux eBPF/bcc version. 2 3 4This traces block I/O and uses layered percpu arrays to bucket the completion 5latencies. Latency percentiles are calculated periodically from the buckets. 6 7# ./biolatpcts.py 8p50=595.0us p75=685.0us p90=1500.0us p99=2500.0us 9p50=55.0us p75=95.0us p90=305.0us p99=2500.0us 10p50=385.0us p75=655.0us p90=1500.0us p99=2500.0us 11[...] 12 13The latency is measured from I/O request to the device, to the device 14completion. This excludes latency spent queued in the OS. 15 16This is a simplified example to demonstrate the calculation of latency 17percentiles. See tools/biolatpcts.py for the full utility. 18