Writing archive

The first iteration of my loop took 145 microseconds and the steady state 12. I separated the causes I could show on my laptop: page faults, cold caches, a pause of 300 ms, lazy binding in C, and the start of the process itself.

A practical pipeline for learning from production AI failures while minimizing personal data, preserving the failure signal, and keeping evaluation fixtures reviewable.

fsync of a new file does not promise that its name is on the disk. I measured directory fsync on ext4: half a microsecond after a file fsync, about 420 microseconds after a rename, and alone it made the name durable while the data stayed in RAM.

Async cancellation usually means dropping a future after Pending. See how select loops lose partial progress and how to design restartable operations.

API schema changes are not only field changes. Separate source contracts from product meaning, preserve evidence, and evolve mappings without spreading breakage.