sgl-project/sglang-jax

[Feature] Speed Up Scheduler Thread Performance

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#293 opened on Oct 30, 2025

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Description

Checklist

Motivation

Scheduler overlap is currently supported, but when scheduler scheduling time exceeds model forward inference time, scheduling cannot be fully masked. For example, with the QWEN3-8B model, concurrency set to 16, input size 1024, output size 1024, scheduling takes 5.5ms, while model run + sampler only takes 5ms. Therefore, we need to speed up scheduler thread performance.

Related resources

Refer to this document profile-with-jax-profiler to profile the scheduler and attempt to modify the code for acceleration

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Contributor guide

Tech stack
python
Domain
backendperformance
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
GitPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Profile the scheduler using the provided JAX profiler guide to identify bottlenecks, then optimize the scheduler code to reduce scheduling time below model inference time.