Segment 23

In this sub-session, the team completed the implementation of the pinned memory pool solution for GPU underutilization by threading the PinnedPool reference from Engine::new() through the evictor callback, dispatch_batch, process_batch, and into PartitionWorkItem. Synthesis functions (synthesize_auto, synthesize_with_hint) were modified to accept an optional Arc<PinnedPool>, and when a capacity hint is available, they check out pinned buffers and create ProvingAssignment instances with pinned backing via a new synthesize_circuits_batch_with_prover_factory function. A fallback path ensures graceful degradation to standard heap allocations if the pool is exhausted. The full implementation compiles cleanly with cargo check --features cuda-supraseal, and a Docker build (cuzk-rebuild:pinned1) was successfully created, ready for deployment to the remote test machine to verify that ntt_kernels H2D transfer time drops from 2-9 seconds to under 100ms.

wire PinnedPool into engine and synthesis pathscreate synthesize_circuits_batch_with_prover_factoryimplement fallback path for pool exhaustionbuild Docker image for pinned pool binarycompile and verify clean build

The Zero-Copy Wiring: Integrating a Pinned Memory Pool into the cuzk Proving Pipeline 3212 words

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