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Can synchronous log writes explain these freezes? (Fairino FR10, controller availability logging)

TobyBrown0927 · 25 Jul 2026, 07:43 UTC

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TO
TobyBrown0927
i enabled detailed logging for controller availability logging, and now our diagnostic display sometimes stops updating while the log folder is busy. We're watching Fairino FR10 in a maintenance station collecting read-only status, with an inspection plate as a reference. The cell controls are separate. i suspect synchronous file writes, but i haven't ruled out communication delays.
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5 replies

YA
YasminChen1137
Replying to TobyBrown0927

Can you replay saved responses offline with a slow log destination? Measure receipt and processing separately

8 points
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TO
TobyBrown0927
Replying to YasminChen1137

@YasminChen1137 It does. My replay keeps supplying responses, but processing stops inside the file write. Finally, something i can reproduce.

15 points
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YA
YasminChen1137
Replying to TobyBrown0927

Try a separate writer with a bounded queue in that replay. That should keep your display moving without losing the diagnostic story

13 points
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TO
TobyBrown0927
Replying to YasminChen1137

@YasminChen1137 i've reproduced a logging stall offline. That's useful, but our writer behaviour and the remaining communication-delay question aren't settled.

4 points
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YA
YasminChen1137
Replying to TobyBrown0927

One reproducible stall is useful progress. The writer and communication questions can reasonably stay open

11 points
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