[Submitted on 23 Jul 2026]
Title:Beyond Static RAG: An Adaptive, Tri-Metric Routing Framework for Efficient Long-Context Inference on Commodity GPUs
View a PDF of the paper titled Beyond Static RAG: An Adaptive, Tri-Metric Routing Framework for Efficient Long-Context Inference on Commodity GPUs, by Saipraveen Vabbilisetty and 5 other authors
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Abstract:Deploying retrieval-augmented generation (RAG) on commodity GPUs such as the NVIDIA T4 (16 GB VRAM) exposes a practical failure mode we call the Compression Paradox: neural prompt compression can add key-value (KV) cache contention and preprocessing latency that outweigh generation-time savings, while skipping compression can cause out-of-memory (OOM) failures on long contexts. We identify two distinct failure mechanisms when a vLLM-served LLM and a PyTorch-based compressor are co-deployed under tight memory budgets, and introduce the Tri-Metric Router, a deterministic, training-free policy that selects among Raw, Neural (LLMLingua-2), and Lexical (BM25) pipelines. The router uses three CPU-side signals: spatial complexity ($L$), syntactic density ($\rho_{key}$), and type-token ratio (TTR). Unlike prior semantic-only adaptation, our dispatch signal is hardware-physical, based on VRAM headroom and a latency crossover point. Thresholds are calibrated from profiling on LongBench qasper, yielding an operating crossover near 4,332 words on T4; our contribution is this calibration methodology rather than a hardware-specific constant. On out-of-distribution holdouts, the method achieves 0% OOM failures, 88.5 $\pm$ 4.4% oracle alignment, and 49.3% Combined F1, improving over always-on lexical compression by 5.2 points without additional VRAM or training cost.
Comments: This Paper is accepted and presented at ICML Scale Workshop 2026. this https URL (Paper ID :72)
Subjects:
Machine Learning (cs.LG); Information Retrieval (cs.IR)
Cite as: arXiv:2609.17564 [cs.LG]
(or arXiv:2609.17564v1 [cs.LG] for this version)
https://doi.org/10.48550/arXiv.2609.17564
arXiv-issued DOI via DataCite
Submission history
From: Saipraveen Vabbilisetty [view email] [v1] Thu, 23 Jul 2026 18:09:20 UTC (32 KB)
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