sgl-project/sglang

[Feature] Profile the update weights from disk API of SGLang Diffusion

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#18,979 opened on Feb 18, 2026

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good first issue

Description

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Motivation

As we did in this comment:

https://github.com/sgl-project/sglang/pull/18306/#issuecomment-3898841774

We should profile the actual time breakdown in the update weights from disk.

Ideally speaking, 7B models' update should be within 1s (no considering save to disk time) in this https://github.com/zhaochenyang20/Awesome-ML-SYS-Tutorial/blob/main/sglang/latency-accelerate-for-weight-updates/readme.md

Related resources

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Contributor guide

Tech stack
python
Domain
backend
Issue type
feature
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.
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
Python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Profile the update weights from disk function by measuring time breakdown of reading, parsing, and loading weights. Compare to expected latency benchmarks.