$S^3$: Increasing GPU Utilization during Generative Inference for Higher Throughput
Open accessAbstract
Generating texts with a large language model (LLM) consumes massive amounts of memory. Apart from the already-large model parameters, the key/value (KV) cache that holds information about previous tokens in a sequence can grow to be even larger than the model itself. This problem is exacerbated in one of the current LLM serving frameworks which reserves the maximum sequence length of memory for the KV cache to guarantee generating a complete sequence as they do not know the output sequence length. This restricts us to use a smaller batch size leading to lower GPU utilization and above all, lower throughput. We argue that designing a system with a priori knowledge of the output sequence can mitigate this problem. To this end, we propose S$^{3}$, which predicts the output sequence length, schedules generation queries based on the prediction to increase device resource utilization and throughput, and handle mispredictions. Our proposed method achieves 6.49$\times$ throughput over those systems that assume the worst case for the output sequence length.
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The bucketing strategy transforms precise token-level prediction into a more tractable bucket-level approximation.
“The bucketing strategy, a technique also employed in previous works [25; 57; 14], transforms the challenging task of precise token-level prediction into a more tractable bucket-level approximation.”
From OmniRouter: Budget and Performance Controllable Multi-LLM Routing (2025) · cites this paper as [25]
Subsequent research has explored two main directions of prediction models: encoder-only models for classification and decoder-only models for generative prediction.
“Subsequent research has explored two main directions of prediction models: encoder-only models for classification (DynamoLLM [42], S3 [25], TerriInfer [20], SSJF [37], and µ 3 [36]) and decoder-only models for generative prediction like Perception-only (PO) [57].”
From OmniRouter: Budget and Performance Controllable Multi-LLM Routing (2025) · cites this paper as [25]
Predicting LLM generation length is crucial for optimizing computational resources.
“Predicting LLM generation length is crucial for optimizing computational resources.”
From OmniRouter: Budget and Performance Controllable Multi-LLM Routing (2025) · cites this paper as [25]
Existing routing frameworks typically model routing as a sequence of independent, greedy per-query decisions, overlooking global budget constraints and failing to achieve Pareto-efficient resource allocation.
“Existing routing frameworks typically model this as a locally optimal decision-making problem, selecting the presumed best-fit LLM for each query individually, which overlooks global budget constraints, resulting in ineffective resource allocation.”
From OmniRouter: Budget and Performance Controllable Multi-LLM Routing (2025) · cites this paper as [25]
The Abstract and §3 (Design; page unavailable) describe predicting output length and batching generation requests within GPU memory capacity, not choosing a best-fit LLM for each query. A search for model routing, per-query decisions, and global budget constraints found no passage addressing the attributed claim or Pareto-efficient allocation. (LLM, conf=0.78)
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- Authors
- Jin, Y., Wu, C.-F., Brooks, D., & Wei, G.-Y.
- ORCID
- Wei, Gu-Yeon
- Venue
- Advances in Neural Information Processing Systems 36
- Published
- 2023
- Pages
- 18015-18027
- ISSN
- 1049-5258 (ISSN-L)
- OpenAlex
- W7133238857
- Cited by
- 20
- References
- 0
- Citations by year
- 2026: 13 · 2025: 4 · 2024: 3
- FWCI
- 3.58
- Type
- conference paper
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- cc-by
- Locations
- neural information processing systems (publishedVersion)
- arXiv (Cornell University) (submittedVersion, cc-by)
- arXiv (Cornell University) (cc-by)
- Topics
- Physical Sciences › Computer Science › Hardware and Architecture › Parallel Computing and Optimization Techniques
- Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Neural Network Applications
- Physical Sciences › Computer Science › Artificial Intelligence › Topic Modeling
- Keywords
- GPU utilization, generative inference, inference throughput, large language models, GPU scheduling
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