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

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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

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.
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