CGH0S7 e09ae438a2 Cache data_packer lengths in Sync_start to skip redundant buffer-size traversals ...

The data_packer(NULL, ...) calls that compute send/recv buffer lengths
traverse all grid segments × variables × nprocs on every Sync_start
invocation, even though lengths never change once the cache is built.
Add a lengths_valid flag to SyncCache so these length computations are
done once and reused on subsequent calls (4× per RK4 step).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-02-10 21:39:22 +08:00

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