The Reconnaissance Command: Mapping Curio's Task Files for cuzk Integration

Introduction

In the middle of a sprawling coding session dedicated to integrating a custom GPU proving daemon into the Filecoin Curio storage provider, there exists a message that appears, at first glance, to be trivial: a simple find command piped through grep. Yet this message — message index 3333 in the conversation — represents a critical moment of architectural reconnaissance. It is the point at which abstract planning meets concrete codebase reality. Before any integration code can be written, before any task lifecycle can be adapted, the assistant must first understand what exists in the target system. This article examines that single message in depth: its motivation, its assumptions, its output, and its role in the broader narrative of building a remote GPU proving pipeline for Filecoin's proof-of-replication (PoRep) ecosystem.

The Broader Context

To understand message 3333, one must understand the session it belongs to. The conversation is part of Segment 33 of a long-running coding session focused on the cuzk project — a custom CUDA-based Groth16 proving daemon designed to replace the memory-hungry supraseal-c2 pipeline used by Filecoin storage providers. The preceding segments (28 through 32) had already accomplished significant milestones: abandoning a flawed two-lock GPU interlock design, implementing memory-bandwidth interventions, designing a split GPU proving API (Phase 12), and conducting low-memory benchmark sweeps to characterize memory scaling. By Segment 33, the cuzk daemon itself was functionally complete and well-documented.

The task at hand in Segment 33 is integration. The cuzk daemon runs as an independent gRPC server, managing its own GPU resources and queue. But it must be wired into Curio — the Filecoin storage provider's task orchestrator — so that when Curio needs to generate a Groth16 proof (the "C2" step in Filecoin's sealing pipeline), it can delegate that computation to cuzk rather than running it locally. This is not merely a matter of calling a different function. Curio's task system is built around a sophisticated scheduler that uses resource accounting (TypeDetails() returning GPU/RAM costs) and backpressure (CanAccept() querying local resource availability) to decide which tasks a given machine can handle. Integrating cuzk means fundamentally altering this accounting: when cuzk is enabled, Curio should treat proof-generation tasks as having zero local GPU cost, because the actual computation happens elsewhere.

Message 3332, which immediately precedes our target message, shows the assistant reasoning through these integration parameters. It discusses keeping the cuzk daemon independent, leveraging the CanAccept mechanism for backpressure, and investigating the structure of Curio's task files. The assistant mentions looking at tasks/seal, tasks/window, tasks/snap, and tasks/proofshare. It has already run several discovery commands — searching for commit-related files, checking for existing cuzk directories, and examining the CanAccept interface. But it has not yet mapped the full set of task files that will need modification.

The Message Itself

The subject message is a single bash command:

find ./tasks -type f | grep -E "c2|commit2|prove|snap|window|winning"

This is a file discovery command. It recursively lists all regular files under the ./tasks directory, then filters them using an extended regular expression that matches any of six patterns: c2, commit2, prove, snap, window, or winning. The output reveals the structure of Curio's task system:

./tasks/window/faults_simple.go
./tasks/window/compute_do.go
./tasks/window/compute_task.go
./tasks/window/recover_task.go
./tasks/window/submit_task.go
./tasks/winning/inclusion_check_task.go
./tasks/winning/metrics.go
./tasks/winning/winning_task.go
./tasks/snap/finalize_pieces.go
./tasks/snap/metrics.go
./tasks/snap/task_encode.go
./tasks/snap/task_movestorage.go
./tasks/snap/task_prove.go
./tasks/snap/task_submit.go
./tasks/pdp/task_prove.go
./tasks/proofshare/task_client_poll_snap.go
./task...

The output is truncated, indicated by the trailing ./task..., suggesting the file list was longer than what fits in the display.

Why This Command Was Written

The motivation behind this command is architectural mapping. The assistant is about to embark on a significant refactoring effort — wiring the cuzk client into multiple Curio task types. Before it can modify files, it needs to know:

  1. Which task files exist for each proof-related workflow. The grep patterns are carefully chosen: c2 and commit2 target the commit2/C2 proof step (the Groth16 computation that cuzk accelerates); prove captures generic prove tasks; snap targets SnapDeals (a Filecoin mechanism for replacing replica data); window and winning target WindowPoSt and WinningPoSt (the two types of proof-of-spacetime that storage providers must periodically submit).
  2. The organizational structure of the task directory. Are tasks organized by type (seal, snap, window, winning, proofshare)? Are there shared files? The output confirms a directory-per-task-type structure.
  3. Which files are likely candidates for modification. The assistant needs to identify files that contain proof-generation logic — the functions that call into the SNARK proving pipeline. These are the functions that will be split: the "vanilla" proof generation (which requires sector data and must run locally) stays, while the SNARK computation (the GPU-intensive Groth16 proving) gets delegated to cuzk. The command also serves a secondary purpose: validation. The assistant had previously reasoned about which task types need modification (PoRep C2, SnapDeals ProveReplicaUpdate, WindowPoSt, WinningPoSt, and proofshare). This command checks whether the actual codebase matches that mental model. If, for example, there were no task_prove.go under ./tasks/snap/, the assistant would need to reconsider its approach.

Assumptions Embedded in the Command

Every search pattern encodes assumptions. The assistant's choice of grep patterns reveals several implicit beliefs about the codebase:

Assumption 1: Task files are organized under ./tasks/. This is a structural assumption about Curio's codebase. The assistant has already verified this in previous commands (msg 3332 shows it searching for files in ./tasks/seal/), but the find ./tasks command re-affirms it.

Assumption 2: The relevant files contain specific keywords in their names. The patterns c2, commit2, prove, snap, window, and winning are assumed to be reliable indicators of proof-related task files. This is a reasonable heuristic, but it could miss files with unconventional naming (e.g., a file named task_groth16.go that contains C2 logic but doesn't match any pattern).

Assumption 3: The C2 proof step is the only part that needs offloading. The patterns focus on files related to proof generation, not on the broader sealing pipeline (pre-commit, piece-adding, etc.). This reflects the architectural decision made earlier: vanilla proof generation (which needs sector data) stays local; only the SNARK computation (the Groth16 proving) is offloaded to cuzk.

Assumption 4: WindowPoSt and WinningPoSt tasks follow similar patterns. The inclusion of window and winning patterns assumes these task types also have proof-generation steps that can be offloaded. This is correct — both PoSt types require SNARK proofs over sector data — but the assistant will later discover that the integration pattern for these tasks differs from PoRep and SnapDeals.

Assumption 5: The output is complete enough to work with. The truncated output (./task...) means the assistant doesn't see the full list. It assumes the visible portion is representative and that any missing files can be discovered later through iterative exploration.

What the Output Reveals

The command's output provides a concrete map of the integration surface. Several observations stand out:

WindowPoSt has the most files. There are five files under ./tasks/window/: faults_simple.go, compute_do.go, compute_task.go, recover_task.go, and submit_task.go. This suggests WindowPoSt is the most complex workflow, with separate files for computation, recovery, and submission.

WinningPoSt is simpler. Only three files: inclusion_check_task.go, metrics.go, and winning_task.go. The main task logic is likely concentrated in winning_task.go.

SnapDeals has a clear prove file. ./tasks/snap/task_prove.go is the obvious target for SnapDeals proof offloading. The other files (task_encode.go, task_movestorage.go, task_submit.go) handle encoding, storage moves, and submission — steps that don't involve SNARK computation.

Proofshare has its own directory. ./tasks/proofshare/task_client_poll_snap.go suggests proofshare tasks follow a polling pattern, which may require a different integration approach.

PDP (Proof-of-Data-Possession) also has a prove task. ./tasks/pdp/task_prove.go indicates there's another proof type that might benefit from cuzk offloading, though the assistant's plan hadn't explicitly mentioned it.

The seal directory is notably absent from the output. Despite the assistant searching for seal files in msg 3332, the grep patterns in this command don't include seal. This is because the seal task's C2 step is handled through a different mechanism — the assistant has already identified tasks/seal/task_submit_commit.go as the relevant file in msg 3332.

The Thinking Process Visible in the Message

Although the message itself contains only a bash command, its reasoning context is visible through the surrounding messages. Message 3332 shows the assistant's internal monologue:

"I'm now investigating Curio's task system, focusing on how tasks are defined and scheduled. I'm looking into tasks/seal, tasks/window, tasks/snap, and tasks/proofshare to understand the architecture..."

This reveals a systematic discovery process. The assistant has already:

  1. Identified the task types that need modification (PoRep, SnapDeals, WindowPoSt, WinningPoSt, proofshare)
  2. Located the seal task files (task_submit_commit.go)
  3. Found the cuzk proto definitions (./extern/cuzk/cuzk-proto/proto/cuzk)
  4. Examined the CanAccept interface pattern Message 3333 is the next logical step: broaden the search to all task directories, using grep patterns that cover all identified proof types. The assistant is building a comprehensive file map before writing any integration code. The thinking process also reveals an important design decision: the assistant is prioritizing keeping cuzk independent. This means the integration must be non-invasive — Curio tasks should communicate with cuzk via gRPC rather than through shared memory or direct library calls. The file discovery in msg 3333 directly supports this design by identifying which files need the gRPC client plumbing.

Knowledge Required and Created

Input knowledge required to understand this message includes:

The Message's Role in the Larger Narrative

Message 3333 is a quintessential "reconnaissance" message in a software engineering conversation. It sits at the boundary between planning and execution. Before this message, the assistant had a mental model of which task types needed modification. After this message, it has a file-level map of the actual codebase.

This pattern — reason, then search, then implement — is characteristic of the assistant's methodology throughout the cuzk project. In earlier segments, we saw the same pattern when investigating GPU memory bottlenecks: first reason about the likely causes, then run diagnostic commands to gather data, then implement fixes. Message 3333 applies this same methodology to the integration problem.

The file map produced by this command directly enables the implementation work that follows in the rest of Segment 33. The chunk summary for chunk 1 (which follows msg 3333) describes how the assistant "systematically wired the cuzk remote proving daemon into three core Curio task types: PoRep (seal), SnapDeals prove, and proofshare (PSProve)." The file map from msg 3333 provided the coordinates for those modifications.

Conclusion

A single find command piped through grep may seem unremarkable, but in the context of a complex integration effort, it represents a critical act of discovery. Message 3333 is the moment when abstract architectural planning collides with concrete codebase reality. The assistant needed to know which files to modify before it could write a single line of integration code, and this command provided that knowledge. The careful choice of grep patterns — c2, commit2, prove, snap, window, winning — reflects a deep understanding of Filecoin's proof landscape and Curio's task structure. The truncated output hints at the complexity of the integration surface. And the message's position in the conversation — between reasoning about integration parameters and implementing the actual code changes — marks it as the bridge from planning to execution.

In the broader narrative of the cuzk project, message 3333 is a small but necessary step toward a larger goal: building a continuous, memory-efficient proving pipeline that decouples GPU computation from Curio's local resource scheduler. The file map it produced would directly inform the integration of cuzk into PoRep, SnapDeals, and proofshare tasks, ultimately enabling storage providers to offload their most memory-intensive computations to a dedicated proving daemon.