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Date
Action
CMakeLists.txt
276
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biolatpcts.py
3.23
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biolatpcts_example.txt
650
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bitehist.py
1.36
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bitehist_example.txt
1.18
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dddos.py
3.73
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dddos_example.txt
2.06
KB
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disksnoop.py
1.9
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disksnoop_example.txt
1.55
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hello_fields.py
679
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hello_perf_output.py
1.24
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hello_perf_output_using_ns.py
1.8
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kvm_hypercall.py
1.48
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kvm_hypercall.txt
1.74
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mallocstacks.py
1.9
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mysqld_query.py
1.66
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mysqld_query_example.txt
499
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nflatency.py
6.07
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nodejs_http_server.py
1.34
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nodejs_http_server_example.txt
276
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stack_buildid_example.py
3.03
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stacksnoop.py
3.18
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stacksnoop_example.txt
2.8
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strlen_count.py
1.3
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strlen_hist.py
1.81
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strlen_hist_ifunc.py
3.71
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strlen_snoop.py
1.35
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sync_timing.py
1.36
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task_switch.c
499
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task_switch.py
486
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tcpv4connect.py
2.36
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tcpv4connect_example.txt
1.04
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trace_fields.py
589
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trace_perf_output.py
1.56
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undump.py
3.52
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undump_example.txt
886
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urandomread-explicit.py
1.48
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urandomread.py
1.01
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urandomread_example.txt
675
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vfsreadlat.c
896
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vfsreadlat.py
1.3
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vfsreadlat_example.txt
3.53
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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.