ianchb afd4006da2 Cache GSL in SyncPlan and apply async Sync to Z4c_class ...

Major optimization: Pre-build grid segment lists (GSLs) once per Step() call
via SyncPreparePlan(), then reuse them across all 4 RK4 substep SyncBegin calls
via SyncBeginWithPlan(). This eliminates the O(cpusize * blocks^2) GSL rebuild
cost that was incurred on every ghost zone exchange.

Applied async SyncBegin/SyncEnd overlap pattern to Z4c_class.C (ABEtype==2,
the default configuration), which was still using blocking Parallel::Sync.
Both the regular and CPBC variants of Z4c Step() are now optimized.

Co-authored-by: copilot-swe-agent[bot] <198982749+copilot@users.noreply.github.com>

2026-02-08 16:46:44 +08:00

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