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5 In the context of high-performance computing (HPC), the Operating System
9 system. Moreover, hardware-related jobs can also cause noise, for example,
21 NMI or in the hardware itself. At the end of the period, hwlatd enables
32 source of interferences, increasing a per-cpu interference counter. The
38 hardware-related noise. In this way, osnoise can account for any
39 source of interference. At the end of the period, the osnoise tracer
40 prints the sum of all noise, the max single noise, the percentage of CPU
44 -----
59 # _-----=> irqs-off
60 # / _----=> need-resched
61 # | / _---=> hardirq/softirq
62 # || / _--=> preempt-depth MAX
63 …# || / SINGLE Interfe…
64 … |||| RUNTIME NOISE % OF CPU NOISE +-----------------------------+
65 …# TASK-PID CPU# |||| TIMESTAMP IN US IN US AVAILABLE IN US HW N…
67 …<...>-859 [000] .... 81.637220: 1000000 190 99.98100 9 18 0 1007 …
68 …<...>-860 [001] .... 81.638154: 1000000 656 99.93440 74 23 0 1006 …
69 …<...>-861 [002] .... 81.638193: 1000000 5675 99.43250 202 6 0 1013 …
70 …<...>-862 [003] .... 81.638242: 1000000 125 99.98750 45 1 0 1011 …
71 …<...>-863 [004] .... 81.638260: 1000000 1721 99.82790 168 7 0 1002 …
72 …<...>-864 [005] .... 81.638286: 1000000 263 99.97370 57 6 0 1006 …
73 …<...>-865 [006] .... 81.638302: 1000000 109 99.98910 21 3 0 1006 …
74 …<...>-866 [007] .... 81.638326: 1000000 7816 99.21840 107 8 0 1016 …
76 In addition to the regular trace fields (from TASK-PID to TIMESTAMP), the
77 tracer prints a message at the end of each period for each CPU that is
80 - The RUNTIME IN US reports the amount of time in microseconds that
82 - The NOISE IN US reports the sum of noise in microseconds observed
84 - The % OF CPU AVAILABLE reports the percentage of CPU available for
86 - The MAX SINGLE NOISE IN US reports the maximum single noise observed
88 - The Interference counters display how many each of the respective
96 ---------------------
100 - osnoise/cpus: CPUs at which a osnoise thread will execute.
101 - osnoise/period_us: the period of the osnoise thread.
102 - osnoise/runtime_us: how long an osnoise thread will look for noise.
103 - osnoise/stop_tracing_us: stop the system tracing if a single noise
106 - osnoise/stop_tracing_total_us: stop the system tracing if total noise
109 - tracing_threshold: the minimum delta between two time() reads to be
114 ------------------
119 - osnoise:sample_threshold: printed anytime a noise is higher than
121 - osnoise:nmi_noise: noise from NMI, including the duration.
122 - osnoise:irq_noise: noise from an IRQ, including the duration.
123 - osnoise:softirq_noise: noise from a SoftIRQ, including the
125 - osnoise:thread_noise: noise from a thread, including the duration.
137 …osnoise/8-961 [008] d.h. 5789.857532: irq_noise: local_timer:236 start 5789.857529929 duratio…
138 …osnoise/8-961 [008] dNh. 5789.858408: irq_noise: local_timer:236 start 5789.858404871 duratio…
139 …migration/8-54 [008] d... 5789.858413: thread_noise: migration/8:54 start 5789.858409300 dur…
140 …osnoise/8-961 [008] .... 5789.858413: sample_threshold: start 5789.858404555 duration 8812 ns…