sgl-project/sglang

[Task] Add priority scheduling CIs for preemption path

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#13,470 opened on Nov 18, 2025

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good first issue

Description

Checklist

Motivation

There is a number token and request level memory accounting issues reported and fixed by the community recently. It would be good to complement them with robust CI tests.

Context:

  1. https://github.com/sgl-project/sglang/pull/12494
  2. https://github.com/sgl-project/sglang/pull/13142
  3. https://github.com/sgl-project/sglang/pull/13201; https://github.com/sgl-project/sglang/issues/13111 (TestRemTotalTokenOffsetBug)
  4. https://github.com/sgl-project/sglang/blob/5ef728716b2c1159bbb7cd5c098e7720137354ce/python/sglang/srt/managers/schedule_policy.py#L666-L668 - cover this case

Related resources

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Contributor guide

Tech stack
python
Domain
backend
Issue type
test
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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
PythonGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Review the linked PRs and code to understand the preemption path and memory accounting issues. Then design CI tests that cover the cases in the references.