64 lines
3.4 KiB
Markdown
64 lines
3.4 KiB
Markdown
# 12 — Implement continuous batching and bounded admission
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Status: ready-for-agent
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## Mandatory fresh-session context
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- Read [RALPH-CONTEXT.md](../RALPH-CONTEXT.md) completely before changing code.
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- This issue is `DGR-012` in [prd.json](../prd.json).
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- Read the evidence README for every dependency listed below.
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- Inspect current code and `git status`; historical text and previous agent claims are not evidence.
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## Description
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As a node operator, I need active sessions batched safely so that concurrency increases aggregate throughput rather than serializing every request.
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## Expected durable outputs
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- Continuous batching/admission scheduler
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- Concurrency 1/2/4/8 report
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- Queue, batch and KV-pressure evidence
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- evidence/DGR-012/README.md
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## Acceptance criteria
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- [ ] Node scheduler admits sessions against weight, KV, scratch, and queue budgets.
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- [ ] Compatible decode steps from multiple sessions form llama.cpp batches while preserving per-session positions and outputs.
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- [ ] Prefill does not starve decode; scheduling policy and bounds are explicit.
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- [ ] Backpressure prevents unbounded queued activations or KV growth.
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- [ ] Capability telemetry reports active sessions, queue depth, batch occupancy, KV pressure, prefill/decode rates, and rejected admissions.
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- [ ] Concurrency 1/2/4/8 benchmark identifies saturation and shows no cross-session corruption.
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- [ ] Targeted pytest tests pass
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- [ ] python -m compileall packages tests passes for Python changes
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- [ ] git diff --check passes
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- [ ] Default tests remain deterministic, model-download-free, API-credit-free, and GPU-free
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- [ ] Full deterministic pytest -q passes, or the exact pre-existing unrelated failure is recorded with a clean-tree reproduction
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- [ ] Pinned native C++ target builds and focused CTest/protocol tests pass where native code is touched
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- [ ] llama.cpp patch stack applies cleanly to the exact pinned commit where patch code is touched
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- [ ] Read .scratch/distributed-gguf-runtime/RALPH-CONTEXT.md and this story issue completely before changing code
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- [ ] Read and verify every dependency evidence README before relying on dependency behavior
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- [ ] Preserve all pre-existing working-tree changes and stage only files belonging to this story
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- [ ] Write .scratch/distributed-gguf-runtime/evidence/DGR-012/README.md with files changed, exact commands and real results, limitations, compatibility notes, and dependent-story handoff
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- [ ] Update only this story issue to Status: done after every acceptance criterion and quality gate passes
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## Dependency handoff
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- `DGR-007` must have `passes: true`; read `../evidence/DGR-007/README.md` and verify its referenced files/commands.
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- `DGR-009` must have `passes: true`; read `../evidence/DGR-009/README.md` and verify its referenced files/commands.
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- `DGR-010` must have `passes: true`; read `../evidence/DGR-010/README.md` and verify its referenced files/commands.
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## Finish contract
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- Create the task evidence directory and durable handoff required above.
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- Preserve real failures and blockers; never fabricate benchmark, model, test or hardware output.
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- Change this issue to `Status: done` only after all criteria pass.
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- Emit `<promise>COMPLETE</promise>` only after the evidence handoff exists.
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## References
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- [Ralph execution context](../RALPH-CONTEXT.md)
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- [PRD](../PRD.md)
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- [Implementation strategy](../implementation-strategy.md)
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- [Current architecture](../architecture.md)
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- [Architecture decision](../../docs/adr/0024-distributed-gguf-runtime.md)
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