Chunk 9.1

In this chunk, the assistant addressed the critical performance regression from the per-partition PoRep C2 pipeline by implementing a batch-all-partitions synthesis mode (`synthesize_porep_c2_batch`) that synthesizes all 10 partitions in a single rayon parallel call and proves them in one GPU call. The pipeline support was also expanded to all proof types by adding `synthesize_post()` (for WinningPoSt and WindowPoSt) and `synthesize_snap_deals()` in `pipeline.rs`, which required inlining vanilla proof partitioning logic from `filecoin-proofs` due to private module restrictions. These new functions were wired into the engine's dispatch logic, and the necessary prover functions were made public. An end-to-end GPU test of the batch-mode PoRep C2 pipeline was successfully conducted, producing a valid 1920-byte proof in **91.2 seconds**—matching the monolithic Phase 1 baseline (~93s) and representing a massive improvement over the previous per-partition mode (~611s). All 15 unit tests pass with zero warnings from cuzk code, and both CUDA and non-CUDA builds compile cleanly. The todo list was updated to reflect the completion of the batch-mode fix and PoSt/SnapDeals synthesis implementations. With single-proof latency resolved, the assistant began planning the next major architectural goal: true async overlap for throughput on a continuous stream of proofs. The design involves a dedicated synthesis task that pushes `SynthesizedProof` objects into a bounded channel (`synth_queue`), from which GPU workers pull, allowing synthesis of proof N+1 to overlap with GPU proving of proof N. The engine's worker architecture was reviewed to plan this integration, marking the transition from monolithic to pipelined to fully async overlap.

From Crisis to Blueprint: How a 6.6× Performance Regression Reshaped the cuzk Pipelined Proving Engine 1971 words

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