| Server IP : 216.250.13.251 / Your IP : 216.73.216.164 Web Server : nginx/1.24.0 System : Linux gunay 6.8.0-134-generic #134-Ubuntu SMP PREEMPT_DYNAMIC Fri Jun 26 18:43:11 UTC 2026 x86_64 User : root ( 0) PHP Version : 7.4.33 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : OFF Directory : /usr/share/doc/bpfcc-tools/examples/tracing/ |
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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.