Segment 16
In this sub-session, the assistant finished the remaining engine.rs changes, which formed the heart of the memory manager integration. The start() method was rewritten to remove old SRS and PCE preload blocks, wire the evictor callback into the budget after GPU detection, and replace partition_workers-based channel capacity with budget-derived values. The partition_semaphore was eliminated, and both process_batch() and dispatch_batch() signatures were updated to accept &MemoryBudget and &PceCache. All five dispatch_batch call sites were converted. PoRep and SnapDeals per-partition dispatch paths now acquire working-memory budget via budget.acquire(), pre-acquire SRS budget in async context, and use pce_cache for PCE extraction. The monolithic synthesis path similarly acquired budget and attached reservations. The GPU worker loop implements two-phase release—releasing a/b/c after prove_start and dropping the remainder after prove_finish—with proper error handling. The preload_srs() method was updated for budget-aware SrsManager. Beyond engine.rs, cuzk.example.toml was updated to reflect the new configuration fields and remove deprecated entries, and cuzk-bench/src/main.rs was updated to create a local PceCache instance and pass it to the updated extraction function, eliminating all remaining references to the removed APIs.
The Heart of the Machine: Integrating a Unified Memory Manager into cuzk's GPU Proving Engine