https://tyhorton.com/writing Short engineering write-ups and postmortems by Tyrian Horton. en-us Sat, 11 Jul 2026 00:00:00 GMT https://tyhorton.com/writing/three-kernel-panics-284b-model-128gb-mac https://tyhorton.com/writing/three-kernel-panics-284b-model-128gb-mac Sat, 11 Jul 2026 00:00:00 GMT Running DeepSeek-V4-Flash (284B MoE) on a 128GB M4 Max took three kernel panics. The stable fix was pure-CPU pageable mmap plus a wired-memory watchdog, at ~6.4 tok/s. https://tyhorton.com/writing/dashboard-frozen-behind-green-checks https://tyhorton.com/writing/dashboard-frozen-behind-green-checks Sat, 11 Jul 2026 00:00:00 GMT A parity guard compared a ratio metric with an absolute diff against a constant named _PERCENT, freezing a dashboard for three days behind all-green health checks. The fix, and the dead-man's-switch. https://tyhorton.com/writing/apple-renamed-a-report-and-my-analytics-lied https://tyhorton.com/writing/apple-renamed-a-report-and-my-analytics-lied Sat, 11 Jul 2026 00:00:00 GMT A vendor renamed a report field with no changelog, a substring match broke, and a fail-silent fallback turned it into fabricated install numbers up to ~70x real. Fail loud on zero matches.