py-spy> Sampling process 500 times a second for 14 seconds. Press Control-C to exit.
[2026-11-09T04:00:18.179563935Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 12 native and 13 python)
[2026-11-09T04:00:19.363651102Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 80 native and 86 python)
[2026-11-09T04:00:20.275907602Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 80 native and 86 python)
[2026-11-09T04:00:20.277551168Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 80 native and 86 python)
[2026-11-09T04:00:20.456473180Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 52 native and 58 python)
[2026-11-09T04:00:24.778823131Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 1 native and 7 python)
[2026-11-09T04:00:27.266509529Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 2 native and 9 python)
[2026-11-09T04:00:29.254130129Z WARN py_spy] Failed to get stack trace from 54295: Failed to merge native and python frames (Have 18 native and 24 python)
py-spy> Wrote raw flamegraph data to 'bench/profiles/before-fastapi/stacks.txt'. Samples: 6979 Errors: 8
py-spy> You can use the flamegraph.pl script from https://github.com/brendangregg/flamegraph to generate a SVG