Files
LEDMatrix/test
ChuckandClaude Opus 5.5 c883a2fd1e feat(perf): a stall watchdog that logs what the render thread is waiting on
The recorder counts freezes; it cannot say why. hdpi showed 1-2s freezes
in both the #628 and offscreen builds, one lining up with hockey's 2s
NHL fetch on the update thread, and nothing in the logs explained it.

StallWatchdog polls every 50ms from its own thread. When a scroll's last
frame is more than 250ms old (and a scroll is still running, so the end
of a scroll is not a stall), it logs the stack of the thread that
presented that frame and the top of every other thread's, then the
stall's length when frames resume. It also measures how late its own
wake-up was: if it was held up as long as the render thread, the whole
interpreter was blocked (C code holding the GIL), not one thread on a
lock. One dump per 30s at most; LEDMATRIX_STALL_WATCHDOG=0 disables it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-24 10:58:27 -04:00
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