As we know, Linux system has a functionality to switch contexts of threads to archive concurrency. I need to measure some metrics to have them visualized. What metrics I need:
Example: I have a process with 2 threads (main and additional)
Metrics:
| PID | TID | Time | Event | CPU core |
|---|---|---|---|---|
| 1 | 1 | 85.0234 | CPU takes on this thread | 1 |
| 1 | 1 | 85.1102 | CPU takes off this thread | 1 |
| 1 | 2 | 85.1201 | CPU takes on this thread | 1 |
| 1 | 2 | 85.1409 | CPU takes off this thread | 1 |
| 1 | 1 | 86.0192 | CPU takes on this thread | 2 |
| 1 | 1 | 86.1122 | CPU takes off this thread | 2 |
| 1 | 2 | 86.2012 | CPU takes on this thread | 3 |
| 1 | 2 | 86.2513 | CPU takes off this thread | 3 |
Having this metrics I can calculate how much time it took for first Thread(TID 1) to be performed on each iteration. For example, the first iteration is 0.0868 (85.1102 - 85.0234)
Do you know any tools which help me with that? Could you provide some examples to get it started?
Have a look at 'perf sched'
And for reporting you could check out 'perf sched timehist' and 'perf sched latency'.
For more information see: https://www.brendangregg.com/blog/2017-03-16/perf-sched.html