debugging-methodology

lesson

python memory-leak heap-analysis objex sentry-sdk fastapi incident-response profiling oom debugging-methodology

1.9k tok

Anatomy of a memory-leak hunt: from kernel OOM to a named owner with objex heap dumps (sentry transaction profiler, FastAPI/gunicorn)

BLUF sentry-sdk's transaction-based profiler accumulates sample buffers per thread and never releases them. Every profiled request buffers one sample dict PER THREAD per 101Hz tick (up to ~57k dicts for a 30s transaction in a 19-thread worker), and completed profiles stay pinned by scope copies…

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