Segment 19

In this sub-session, the Phase 6 slotted partition pipeline was implemented, replacing the monolithic batch PoRep C2 prover with a fine-grained synthesis/GPU overlap architecture. Key changes included refactoring C1 deserialization into a shared ParsedC1Output struct, adding a ProofAssembler, implementing the prove_porep_c2_slotted() function with std::thread::scope and bounded channels, adding slot_size configuration, and creating a SlottedBench subcommand for validation. Benchmarking confirmed the design predictions: slot_size=2 achieved a 1.50× speedup (42.3s vs 63.4s) and 4.2× memory reduction (54 GiB vs 228 GiB) compared to the batch-all baseline, while slot_size=1 reached 39.1s with only 27 GiB memory. A bug in overlap calculation was identified, and slot_size=2 was recommended as the default due to rayon parallelism limits at slot_size=1.

Refactor C1 deserialization into shared ParsedC1Output structImplement ProofAssembler struct for per-slot proof collectionImplement prove_porep_c2_slotted with thread scope and sync_channelAdd slot_size configuration to PipelineConfigWire slotted pipeline into engine process_batchAdd SlottedBench subcommand with GPU utilization trackingBenchmark and validate slotted pipeline performanceIdentify overlap calculation bug and rayon parallelism limits

The Pipelined Partition Prover: How Parallel Synthesis and Per-Partition GPU Proving Reshaped the cuzk SNARK Engine 3873 words

Chunks