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rtla osnoise hist [OPTIONS]
The rtla osnoise hist tool collects all osnoise:sample_threshold occurrence in a histogram, displaying the results in a user-friendly way. The tool also allows many configurations of the osnoise tracer and the collection of the tracer output.
In the example below, osnoise tracer threads are set to run with real-time priority FIFO:1, on CPUs 0-11, for 900ms at each period (1s by default). The reason for reducing the runtime is to avoid starving the rtla tool. The tool is also set to run for one minute. The output histogram is set to group outputs in buckets of 10us and 25 entries:
[root@f34 ~/]# rtla osnoise hist -P F:1 -c 0-11 -r 900000 -d 1M -b 10 -e 25 # RTLA osnoise histogram # Time unit is microseconds (us) # Duration: 0 00:01:00 Index CPU-000 CPU-001 CPU-002 CPU-003 CPU-004 CPU-005 CPU-006 CPU-007 CPU-008 CPU-009 CPU-010 CPU-011 0 42982 46287 51779 53740 52024 44817 49898 36500 50408 50128 49523 52377 10 12224 8356 2912 878 2667 10155 4573 18894 4214 4836 5708 2413 20 8 5 12 2 13 24 20 41 29 53 39 39 30 1 1 0 0 10 3 6 19 15 31 30 38 40 0 0 0 0 0 4 2 7 2 3 8 11 50 0 0 0 0 0 0 0 0 0 1 1 2 over: 0 0 0 0 0 0 0 0 0 0 0 0 count: 55215 54649 54703 54620 54714 55003 54499 55461 54668 55052 55309 54880 min: 0 0 0 0 0 0 0 0 0 0 0 0 avg: 0 0 0 0 0 0 0 0 0 0 0 0 max: 30 30 20 20 30 40 40 40 40 50 50 50
rtla-osnoise(1), rtla-osnoise-top(1)
osnoise tracer documentation: <https://www.kernel.org/doc/html/latest/trace/osnoise-tracer.html>
Written by Daniel Bristot de Oliveira <[email protected]>