Module Core_profiler.OfflineSource

Running a program with offline metrics collection causes it to write out a data file on exit. This data file is typically called profiler.dat. The collected metrics can then be analyzed using profiler-tool.exe.

I don't trust these numbers, but here they are:

┌──────────────────────────────────────────────────────┬──────────┬────────────┐
│ Name                                                 │ Time/Run │ Percentage │
├──────────────────────────────────────────────────────┼──────────┼────────────┤
│ [offline.ml:Timer] at                                │  18.29ns │     10.34% │
│ [offline.ml:Probe] at                                │  21.92ns │     12.38% │
│ [offline.ml:Delta_timer] start_async                 │  10.94ns │      6.18% │
│ [offline.ml:Delta_timer] stop_async                  │  22.78ns │     12.87% │
│ [offline.ml:Delta_timer] start                       │  11.23ns │      6.34% │
│ [offline.ml:Delta_timer] stop                        │  22.84ns │     12.91% │
│ [offline.ml:Delta_timer.wrap_sync] nop               │   2.45ns │      1.38% │
│ [offline.ml:Delta_timer.wrap_sync] wrapped_nop       │  40.59ns │     22.93% │
│ [offline.ml:Delta_timer.wrap_sync] count_256         │ 143.57ns │     81.12% │
│ [offline.ml:Delta_timer.wrap_sync] wrapped_count_256 │ 176.99ns │    100.00% │
│ [offline.ml:Delta_probe] start                       │   2.47ns │      1.40% │
│ [offline.ml:Delta_probe] stop                        │  22.11ns │     12.49% │
│ [offline.ml:Delta_probe] start_async                 │   2.44ns │      1.38% │
│ [offline.ml:Delta_probe] stop_async                  │  22.20ns │     12.54% │
└──────────────────────────────────────────────────────┴──────────┴────────────┘

In Offline, a Delta_probe differs from a two point Group in that for each start/stop pair, only one message is written to the buffer. This means that only the delta in the probe is available, as opposed to deltas in both probe and time.