Tachyon flamegraph: Replaying binary file doesn’t show time/rate in sidebar

[JostMigenda]

Bug report

Bug description:

As discussed with @pablogsal during EuroPython sprints:

python -m profiling.sampling run --binary -o baseline.bin flamegraph_demo.py
python -m profiling.sampling replay --flamegraph -o flamegraph.html baseline.bin

The resulting flamegraph.html shows duration and samples/sec as “--” in sidebar.

This is a fairly minor UX issue; e.g., hovering over the flamegraph gives values for the total time of _run_code, which is a good proxy for the total duration. However, if it is not too difficult to reconstruct these quantities from the binary format, it would be nice to fix this.

CPython versions tested on:

3.15

Operating systems tested on:

macOS

Linked PRs

• gh-154060: Preserve replay duration and rate #154101
• [3.15] gh-154060: Preserve replay duration and rate (GH-154101) #156407