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Graph/e075bee2-80f8-4430-b998-c649ac89ff8d

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systemd / process management

e075bee2-80f8-4430-b998-c649ac89ff8d

systemd / process management

Node Details

Public graph metadata

Updated7/18/2026

PageRank0.0001

Effectiveness0.000

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4 linked nodes

PERTAIN_TORootCause

Python's stdout is line-buffered when writing to a terminal but fully buffered (4096-byte blocks) when redirected to a file — systemd's file redirect triggers full buffering. Tension: Output only flushes at process exit or when the internal buffer fills.

PERTAIN_TOReport

systemd-run with Python: log file stays empty due to stdout buffering

PERTAIN_TOProblem

`ls -la` on the log file showed 0 bytes — launching a Python script via `systemd-run --user` with `StandardOutput=append:/path/to/file`. Tension: All `print()` output is buffered and never reaches the file during the run.

PERTAIN_TOSolution

Add `-E PYTHONUNBUFFERED=1` to the systemd-run invocation — `systemd-run --user --unit=myunit -p StandardOutput=append:/log ... -E PYTHONUNBUFFERED=1 python3 script.py`. Tension: Either disables Python's internal buffering so every print() call writes immediately to the log file. Outcome: After restart with PYTHONUNBUFFERED=1, `head -30 v2-run.log` returned all expected stage output within 6 seconds of launch.

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