Model Serving Pipeline

AI Infrastructure

Model Serving Pipeline

Production-grade inference pipelines with continuous batching, caching, and A/B testing.

Beyond Model Loading

Loading a model onto a GPU and accepting HTTP requests is the minimum viable inference setup, not a production serving pipeline. Production requires continuous batching to maximize GPU utilization, KV-cache management to handle long contexts efficiently, request routing for multi-model deployments, A/B testing infrastructure for model evaluation, and graceful degradation under load. The serving pipeline turns raw GPU compute into a reliable, measurable, and optimizable AI service.

vLLM with PagedAttention

Memory-efficient KV-cache management enables 2-4x higher throughput than naive serving. Continuous batching inserts new requests into running batches. OpenAI-compatible API for drop-in replacement of cloud APIs.

TGI (Text Generation Inference)

Hugging Face-maintained server with flash attention, speculative decoding, and grammar-constrained generation. Prometheus metrics out of the box. Strong community and regular updates aligned with the Hugging Face ecosystem.

Triton Inference Server

Multi-framework serving for LLMs, embedding models, classifiers, and custom models on shared infrastructure. Model ensembles chain preprocessing, inference, and postprocessing. Dynamic batching across model types.

Ollama for Development

Simple model management and serving for development and testing environments. Pull models with one command, serve via local API. Not production-grade but excellent for developer productivity and prototyping.

Serving Pipeline Architecture

1

Receive

API gateway with auth and rate limits

2

Route

Model selection and A/B assignment

3

Batch

Continuous batching and prioritization

4

Infer

GPU execution with KV-cache

5

Stream

SSE token streaming to client

Model Serving Pipeline

REQUEST ROUTERLoad BalancerA/B RouterRate LimiterINFERENCE ENGINEModel RuntimeBatchingQuantizationMODEL STOREModel RegistryVersion ControlArtifactsMONITORINGLatency TrackingDrift DetectionAlerts

Continuous Batching and KV-Cache

The two most impactful optimizations in LLM serving are continuous batching and efficient KV-cache management. Together, they can increase throughput by 3-5x on the same hardware.

Continuous batching. Traditional batching waits until a batch is full or a timeout expires, then processes the entire batch. Continuous batching (iteration-level batching) inserts new requests into the running batch at every decode step. Short requests complete and free their resources while long requests continue generating. GPU utilization stays high regardless of request length distribution.

PagedAttention (vLLM). Traditional KV-cache allocation reserves contiguous memory for the maximum sequence length, wasting 60-80% of GPU memory on padding. PagedAttention allocates KV-cache in small non-contiguous pages, similar to operating system virtual memory. Memory utilization approaches 100%, enabling larger batch sizes and higher throughput.

Prefix caching. When multiple requests share the same system prompt or context prefix, the KV-cache for the shared prefix is computed once and reused. Particularly effective for RAG workloads where the system prompt plus retrieved context is identical across many user queries.

A/B Testing and Canary Deployments

Evaluating model quality in production requires routing a percentage of traffic to alternative models and comparing outcomes. The serving pipeline provides this capability without application changes.

Traffic splitting. Route 95% of traffic to the production model and 5% to a candidate model. Compare latency, output quality (via automated evaluation), and user satisfaction metrics. Gradually increase traffic to the candidate if metrics are favorable.

Shadow mode. Send requests to both models simultaneously but only return the production model's response. Log the candidate model's output for offline evaluation. Zero user impact during testing.

Who This Is For

Model serving pipeline design is for organizations that need reliable, high-performance AI inference in production. If you are past the proof-of-concept stage and need your AI to serve real users with consistent latency, high availability, and measurable quality, this is the infrastructure layer that delivers it.

Contact us at ben@oakenai.tech

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