Inference Autopilot
Find a better SGLang deployment configuration on your own hardware, for your own workload.
Quick Start ·
How It Works ·
Results ·
Download
Inference Autopilot (inferopt) is an optimization CLI for single-host and cooperative multi-host SGLang deployments. Give it a model, GPU resources, a representative workload, optional latency SLOs, and an experiment budget. It validates the deployment, benchmarks relevant configurations, diagnoses bottlenecks, and returns reproducible launch commands backed by measured evidence.
The result is deliberately bounded: it is the best configuration found for the recorded model, SGLang version, hardware, workload, and budget—not a claim of a universal optimum.
What You Get
- Feasibility checks before expensive GPU experiments begin.
- Measured comparisons between the SGLang baseline and workload-specific candidates.
- A statistically confirmed recommendation, or an explicit decision to retain the baseline.
- A directly copyable launch command using flags supported by the installed SGLang version.
- Structured benchmark, log, profiler, and decision artifacts for audit and reuse.
How It Works
- Understand the deployment — inspect GPU memory and topology, checkpoint metadata, SGLang capabilities, official Cookbook evidence, workload shape, prefix locality, deployment mode, and SLOs. InferOpt reads the current
ServerArgs contract on every run and rejects infeasible or incompatible configurations before spending GPU time.
- Establish a trustworthy baseline — launch SGLang, warm the service, discover practical request capacity, and measure a steady-state window sized from concurrency or runtime capacity. Throughput, E2E latency, TTFT, TPOT/ITL, error rate, memory headroom, and SLO results are recorded together.
- Profile and diagnose — capture a bounded serving-only Nsight Systems trace and combine it with SGLang startup/scheduler logs, cache and queue telemetry, CUDA Graph coverage, model structure, and workload evidence. Raw observations are reduced to canonical bottleneck classes that can safely activate optimization rules.
- Search by mechanism — match the current hardware, model, workload, deployment objective, and measured bottleneck against versioned rules, compatible Cookbook recipes, model-native MTP/Mamba features, and the live parameter contract. Search covers distinct mechanisms first, then refines promising values and compatible combinations instead of running a blind Cartesian grid.
- Adapt to results — positive mechanisms receive value refinement; a failed backend can promote a compatible sibling; optional unavailable mechanisms are reported without invalidating unrelated confirmed gains. Startup-only controls such as SGLang 0.5.18+ Weight Cache are analyzed separately from steady-state throughput parameters and are never enabled when their daemon, topology, speculative-decoding, or capacity-pin constraints are unsafe.
- Confirm and report — compare the best candidate with the baseline using resident ABBA windows, SLO and stability gates, confidence intervals, and Bayesian sequential evidence. Clear outcomes stop early; ambiguous outcomes consume reserved complete A/B pairs. The report separates the confirmed winner, the best unconfirmed candidate, and the safe baseline, then emits a complete copy-paste deployment command.
The rule system does not store fixed “best” configurations. It selects relevant mechanisms from live deployment evidence and derives scenario-specific values. The Candidate Registry records why each candidate was selected, rejected, or measured; only configurations that pass compatibility checks, real benchmarks, declared SLOs, and statistical gates can enter the final command.
Requirements
- Python 3.9 or newer.
- A local SGLang checkout or installation runnable by the selected Python interpreter.
- A locally available, SGLang-compatible model.
- NVIDIA GPUs for automatic tuning and profiling.
- Nsight Systems (
nsys) available on PATH.
Multi-host runs additionally require the same model, SGLang environment, and InferOpt version on every node, plus peer-reachable control and SGLang/NCCL data-plane addresses. The recommended launcher runs one InferOpt control process per node under torchrun or the existing cluster scheduler; rank 0 owns optimization and the other ranks act as non-AI cooperative runners. Passwordless SSH is an optional bare-metal launcher, not a requirement.
AMD hardware inventory and planning are supported, but automatic AMD profiling and tuning are not yet implemented. Nsight Compute is optional and requires GPU performance-counter permission for Roofline or kernel analysis.
Install
Install or update directly from GitHub without changing the existing SGLang, CUDA, PyTorch, or model environment:
python3 -m pip install \
--no-deps \
--no-build-isolation \
--force-reinstall \
"git+https://github.com/rednote-machine-learning/Inference-autopilot.git"
For development from a source checkout, run python3 -m pip install ..
Quick Start
Create a task interactively:
inferopt init --output task.json
Values in square brackets are defaults; press Enter to accept them. GPU indexes use commas without spaces, for example 0,1,2. Paths refer to the GPU host where InferOpt runs.
Inspect the environment and generated plan before starting GPU work:
inferopt doctor --task task.json --output doctor.json
inferopt plan --task task.json --output plan.json
Run the experiment and render the report:
inferopt run --task task.json --yes --output final.json
inferopt report --result final.json --output report.md
doctor and plan are read-only. run --yes starts only processes owned by the current experiment and shows stage, candidate, GPU-worker, benchmark, and confirmation progress.
For a multi-host run, create and validate a reusable cluster inventory once, then keep the same task workflow:
inferopt cluster init --output cluster.json
inferopt init --cluster cluster.json --output task.json
inferopt cluster doctor --cluster cluster.json --task task.json --output cluster-doctor.json
For the recommended cooperative launcher, run doctor, plan, and run on all nodes with one process per node (torchrun --nproc-per-node=1, or an equivalent scheduler job). Multi-host trials reserve their complete node/GPU placement atomically and the report emits one copy-paste command per node.
Use inferopt cluster commands --cluster cluster.json --task task.json --operation run to render the exact per-node torchrun commands.
Deployment objective
online_latency optimizes SLO-safe latency and serving capacity.offline_throughput maximizes throughput, optionally under latency or error-rate constraints.
Offline throughput compares different TP/PP/DP layouts by throughput per GPU by default, so a multi-GPU candidate must repay its extra accelerator cost. Use inferopt init --resource-scope per_service only when single-service throughput is intentionally more important than GPU efficiency. Online mode defaults to per_service.
Workload
InferOpt supports fixed-shape synthetic traffic, generated shared-prefix traffic, custom JSONL conversations, and ShareGPT-format data. Use traffic representative of production; recommendations are specific to the measured workload.
SLOs
Latency limits use either p99 or avg consistently across E2E latency, TTFT, and TPOT/ITL. Leave them unset for objective-only tuning.
Experiment intensity
fast defaults to 24 trials and up to 8 steady-state candidates, with budget for roughly two champion rounds.balanced defaults to 40 trials and up to 14 steady-state candidates, typically supporting three to four champion rounds.max defaults to 96 trials and up to 28 steady-state candidates, with wider value refinement and deeper multi-round augmentation.
All modes use the same correctness, SLO, and statistical acceptance gates. Intensity changes search breadth and measurement cost, not the evidence required to authorize a changed deployment command.
Trial budget is adaptive rather than a fixed percentage split. Confirmation reserves only the minimum complete Bayesian A/B blocks; ambiguous results may consume later unused budget. If positive/directional refinement cannot fill its tier, the remaining slots continue the highest-scoring deferred candidates instead of being donated immediately to confirmation.
Offline no-SLO runs omit client --max-concurrency, discover practical capacity from the loaded server, and use ten saturated capacity waves for every baseline, parameter candidate, neighboring value, composition, and final confirmation window. There is no shorter coarse-screen/recheck layer: each service startup produces one deployment-relevant measurement. All positive candidates are persisted and may seed same-tier compositions. Nsight remains a separate bounded three-wave diagnostic capture. Online SLO runs retain their latency-statistic sample floors (p99 defaults to ten concurrency waves).
Composition uses multi-round, budget-driven champion augmentation rather than a fixed top-N menu. Each round combines the strongest measured configuration with every compatible positive atomic peer that is not already contained in it. A parent-relative winner becomes the next round's champion; the loop stops only when no edge improves the champion or the confirmation reserve is reached. Conflicting/dominated candidates are reported, and definitive capability failures prune more aggressive siblings before they consume another model restart. Skipped or pruned capacity is therefore available to untested champion edges such as cache + scheduling or cache + admission controls.
For non-interactive use, begin with assets/task.autopilot.example.json:
cp assets/task.autopilot.example.json task.json
inferopt validate --task task.json
inferopt run --task task.json --yes --output final.json
Results and Artifacts
The output directory contains:
final.json — machine-readable metrics, evidence, decision, and deployment command.report.md — human-readable diagnosis, tested candidates, statistical decision, limitations, and a complete copy-paste launch command.- Exact task, SGLang parameter contract, benchmark outputs, server logs, profile evidence, candidate registry, and rejected-trial reasons.
- Optional private SQLite history for exact-compatible future priors.
Run artifacts may contain model paths and workload details. Keep the output directory private; generated artifacts are ignored by Git by default.
Safety and Scope
Inference Autopilot is intended for authorized single- or multi-host experiments. It does not install packages at runtime, modify drivers or CUDA, edit SGLang or model weights, change kernels automatically, deploy to production, or kill processes it does not own. Precision-changing candidates are opt-in and require separate quality evidence before deployment.
Production rollout orchestration, automatic kernel modification, native Kubernetes/Slurm submission adapters, and complete multimodal workload optimization are not yet implemented.
Agent-Assisted Use
The CLI is fully standalone; no Agent or Codex session is required. Environments that support Skills can use SKILL.md to collect inputs, review plans, monitor runs, and explain evidence. The CLI and recorded experiment artifacts remain the source of performance decisions.
Documentation
License
Licensed under the Apache License 2.0.
Inference Autopilot(inferopt)是一个命令行工具,在你自己的硬件和工作负载上对 SGLang 推理部署做基准测试,诊断瓶颈,并返回可复现、有证据支撑的启动命令。