Segment 18
In this sub-session, we made three major advances: PCE disk persistence, Phase 6 slotted pipeline design, and daemon integration. PCE serialization was implemented using a raw binary format that writes CSR vectors as bulk byte dumps, achieving a 5.4× load speedup over bincode (9.2s vs 49.9s from tmpfs for 25.7 GiB). The daemon now preloads PCE from disk at startup, saves extracted PCE automatically, and triggers background PCE extraction after the first old-path synthesis, eliminating the first-proof penalty entirely. A Phase 6 design document (c2-optimization-proposal-6.md) was written analyzing the slotted partition pipeline, showing that slot_size=2 yields 41s single-proof latency (vs 69.5s batch) with 54 GiB working set (vs 136 GiB), enabled by the discovery that GPU per-circuit cost is ~3.4s with near-zero fixed overhead. The implementation began with prove_porep_c2_slotted() but revealed that synthesize_porep_c2_partition redundantly deserializes C1 JSON per call — a refactor to share parsed data across slots is needed. All changes were committed at 6b0121fa alongside the project doc updates with j=2 parallel pipeline benchmark data.
From 50 Seconds to 9: PCE Disk Persistence, Daemon Integration, and the Phase 6 Slotted Pipeline