Chunk 6.1

In this chunk, the assistant translated the extensive research from the previous segment into concrete code, completing the Phase 1 implementation across six files. Real proving functions for WinningPoSt, WindowPoSt, and SnapDeals were wired up using the correct FFI enum mappings and multi-proof serialization formats. The engine was refactored to support a multi-GPU worker pool with automatic GPU detection and per-worker `CUDA_VISIBLE_DEVICES` isolation, along with per-worker state tracking for future SRS affinity. The protobuf definition was extended with `repeated bytes vanilla_proofs` and renamed commitment fields, while the bench tool gained full support for all proof types via new flags. The entire workspace compiled cleanly with 8 passing unit tests, and the milestone was committed as `d8aa4f1d`. After the commit, the assistant reviewed the project plan (`cuzk-project.md`) to assess remaining Phase 1 deliverables. A key architectural decision was made to defer GPU affinity-based scheduling to Phase 2, as the current process-global `GROTH_PARAM_MEMORY_CACHE` makes per-GPU SRS tracking unnecessary for this phase. The shared priority queue with `BinaryHeap` was retained as the correct design for Phase 1. The assistant then identified the `gen-vanilla` command as the next critical deliverable for end-to-end testing of the new proof types. Research into the `filecoin-proofs-api` function signatures for vanilla proof generation was completed, setting the stage for the next implementation push. This demonstrates a systematic, research-driven approach to building a complex distributed proving system, balancing immediate implementation needs with forward-looking architectural planning.

From Enum to Engine: The Architecture of Phase 1 in the cuzk Proving Engine 1927 words

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