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e4d4282026
The update_batch_nios handler looped serially across all entries (5010 for a 2505-link topology). On started nodes each entry does uBridge I/O, so the serial loop added orders of magnitude to the fan-out wall time. Group entries by node_id before dispatching. Different nodes talk to their own uBridge process (AF_UNIX socket) and are fully independent, so their updates run in parallel via asyncio.gather. Per-node entries are still serial (respecting the per-node uBridge command lock).