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<title>Hong Xu, Henry</title>
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<td id="layout-menu">
<div class="menu-category">Hong Xu</div>
<div class="menu-item"><a href="index.html" class="current">Home</a></div>
<div class="menu-item"><a href="teaching.html">Teaching</a></div>
<div class="menu-item"><a href="services.html">Services</a></div>
<div class="menu-item"><a href="bio.html">Biography</a></div>
<div class="menu-category">Research</div>
<div class="menu-item"><a href="papers.html">Publications</a></div>
<div class="menu-item"><a href="students.html">Students</a></div>
<div class="menu-item"><a href="join.html">Joining us</a></div>
<div class="menu-item"><a href="artifacts.html">Artifacts</a></div>
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<h1>Hong Xu, Henry</h1>
</div>
<table class="imgtable"><tr><td>
<img src="Henry.jpg" alt="Henry" width="WIDTHpx" height="270px" /> </td>
<td align="left"><p><img src="chn-name.png" width="70"><br />
Associate Professor <br />
<a href="https://www.cse.cuhk.edu.hk/en/" target=“blank”>Department of Computer Science and Engineering</a> <br />
<a href="https://www.cuhk.edu.hk/english/index.html" target=“blank”>Chinese University of Hong Kong</a><br />
Shatin, Hong Kong SAR, China<br />
</p>
<p>Office: Room 914, Ho Sin-Hang Engineering Building <br />
Phone: +852 3943 8399 <br />
Email: hongxu [at] cuhk.edu.hk <br />
Web: <a href="https://henryhxu.github.io" target=“blank”>https://henryhxu.github.io</a>
</p>
<p><a target="<u>blank" href="https://scholar.google.com/citations?user=BZHzIFIAAAAJ&hl=en"> <img src="gs.png" width="20"> </a>
<a target="</u>blank" href="https://www.linkedin.com/in/henryhxu/"> <img src="in.png" width="20"> </a>
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</p>
</td></tr></table>
<h2>Research Interests</h2>
<p>I work on systems and networking. I lead the NetX Lab. Welcome to visit us!
</p>
<p>Our research is/was supported by funding from
</p>
<ul>
<li><p>Research Grants Council (RGC) of Hong Kong, The Chinese University of Hong Kong, City University of Hong Kong
</p>
</li>
<li><p>Amazon Web Services, Azure, ByteDance, Huawei, Microsoft Research Asia, etc.
</p>
</li>
</ul>
<h2>Current Projects</h2>
<ul>
<li><p><b>AI systems</b>: AI is important, but infra and deployment support is often the bottleneck to real-world use
</p>
<ul>
<li><p><a href="index.html" target=“blank”>Agentic systems</a>, support the compound workflows of agents with complex reasoning paths, inter-model communication, and external tool calling
</p>
</li>
<li><p><a href="index.html" target=“blank”>LLM performance</a>, faster, cheaper, without being dumber that is…
</p>
</li>
<li><p><a href="index.html" target=“blank”>Reliability</a>, fault-tolerant systems that won't break, and AIOps that autonomously troubleshoot incidents, for hyperscale infra
</p>
</li>
<li><p><a href="index.html" target=“blank”>Simulation</a>, key to understand the trade-offs and scaling laws of training and inference
</p>
</li>
<li><p>Related pubs: <a href="https://arxiv.org/abs/2605.21312" target=“blank”>Frontier</a>, <a href="http://arxiv.org/abs/2412.12487" target=“blank”>Echo@SC’26</a>, <a href="https://dl.acm.org/doi/10.1145/3789240.3829124" target=“blank”>Silverstone@SIGCOMM’26</a>, <a href="https://arxiv.org/abs/2601.23278" target=“blank”>FOCUS@ICML’26</a>, <a href="share/yuetao-mlsys26.pdf" target=“blank”>PRISM@MLSys’26</a>, <a href="share/yitao-fse26.pdf" target=“blank”>TSGuard@FSE’26</a>, <a href="https://dl.acm.org/doi/10.1145/3760250.3762216" target=“blank”>DSV@ASPLOS’26</a>, <a href="https://dl.acm.org/doi/10.1145/3731569.3764848" target=“blank”>Mycroft@SOSP’25</a>, <a href="https://arxiv.org/abs/2404.18322" target=“blank”>StitchLLM@ACL’25</a>, <a href="https://dl.acm.org/doi/10.1145/3676641.3716278" target=“blank”>Ayo@ASPLOS’25</a>, <a href="share/jiamin-emnlp23.pdf" target=“blank”>EMNLP’23</a>, <a href="share/jiamin-atc23.pdf" target=“blank”>Lina@ATC’23</a>, <a href="https://dl.acm.org/doi/10.1145/3552326.3587445" target=“blank”>Lyra@EuroSys’23</a>
</p>
</li>
</ul>
</li>
</ul>
<ul>
<li><p><b>Networking</b>: building the future network
</p>
<ul>
<li><p><a href="index.html" target=“blank”>Programmable dataplane</a>, how can we better use the SmartNICs/DPUs?
</p>
</li>
<li><p><a href="index.html" target=“blank”>ML-empowered network management</a>, how can ML help reduce the human effort needed in network management tasks?
</p>
</li>
<li><p>Related pubs: <a href="https://www.usenix.org/conference/nsdi26/presentation/wu-shaofeng" target=“blank”>SmartSwitch@NSDI’26</a>, <a href="." target=“blank”>Matt@APNet’26</a>, <a href="https://arxiv.org/abs/2508.17990" target=“blank”>Xumi</a>, <a href="https://dl.acm.org/doi/10.1145/3669940.3707232" target=“blank”>Yala@ASPLOS’25</a>, <a href="https://arxiv.org/abs/2312.11871" target=“blank”>Meili</a>, <a href="https://dl.acm.org/doi/abs/10.1145/3544216.3544244" target=“blank”>NAssim@SIGCOMM’22</a>, <a href="https://dl.acm.org/doi/10.1145/3544216.3544248" target=“blank”>DQN@SIGCOMM’22</a>, <a href="share/wenlong-infocom24.pdf" target=“blank”>INFOCOM’24</a>, <a href="https://dl.acm.org/doi/10.1145/3555050.3569118" target=“blank”>CoNEXT’22</a>, <a href="share/zhixiong-atc20.pdf" target=“blank”>ATC’20</a>, <a href="share/jingzong-mm23.pdf" target=“blank”>MM’23</a>, <a href="share/jingzong-infocom23.pdf" target=“blank”>INFOCOM’23</a>
</p>
</li>
</ul>
</li>
</ul>
<ul>
<li><p><b>Learning</b>: we also study theory and algorithm on the side
</p>
<ul>
<li><p><a href="." target=“blank”>Learning to Optimize (L2O)</a>, how can we leverage DL to help solve optimization programs?
</p>
</li>
<li><p>Related pubs: <a href="https://arxiv.org/abs/2601.17261" target=“blank”>AGZO@ICML’26</a>, <a href="https://arxiv.org/abs/2501.18092" target=“blank”>Learning for GD@NeulIPS’25</a>, <a href="https://arxiv.org/abs/2412.00059" target=“blank”>Step-sizes in Quasi-Newton</a>, <a href="share/qingyu-cvpr24.pdf" target=“blank”>CVPR’24</a>, <a href="share/qingyu-infocom24.pdf" target=“blank”>INFOCOM’24</a>
</p>
</li>
</ul>
</li>
</ul>
<h2>Recent Publications (<a href="papers.html" target=“blank”>full list</a>)</h2>
<ul>
<li><p>“<a href="." target=”blank“>Scalable and Efficient Simulation of LLM Training</a>”, SC 2026.
</p>
</li>
<li><p>“<a href="https://dl.acm.org/doi/10.1145/3789240.3829124" target=”blank“>Dynamic Compute and Network Orchestration for Disaggregated RL</a>”, SIGCOMM 2026.
</p>
</li>
<li><p>“<a href="https://www.usenix.org/conference/osdi26/presentation/zhang-yunmo" target=”blank“>Efficient GPU-Centric Evolving Graph Processing at Scale</a>”, OSDI 2026.
</p>
</li>
<li><p>“<a href="share/yitao-fse26.pdf" target=”blank“>TSGuard: Automated User-Centric Incident Diagnosis for AI Workloads in the Cloud</a>”, FSE 2026
</p>
</li>
<li><p>“<a href="https://www.usenix.org/system/files/nsdi26-wu-shaofeng.pdf" target=”blank“>Offloading Cloud Network Services at Production Scale with SONiC DASH SmartSwitch</a>”, NSDI 2026
</p>
</li>
<li><p>“<a href="https://dl.acm.org/doi/10.1145/3760250.3762216" target=”blank“>Dynamic Sparsity in Large-Scale Video DiT Training</a>”, ASPLOS 2026
</p>
</li>
<li><p>“<a href="https://dl.acm.org/doi/10.1145/3731569.3764848" target=”blank“>Mycroft: Tracing Dependencies in Collective Communication Towards Reliable LLM Training</a>”, SOSP 2025
</p>
</li>
<li><p>“<a href="https://dl.acm.org/doi/10.1145/3676641.3716278" target=”blank“>Towards End-to-End Optimization of LLM-based Applications with Ayo</a>”, ASPLOS 2025
</p>
</li>
<li><p>“<a href="https://dl.acm.org/doi/10.1145/3669940.3707232" target=”blank“>Performance Prediction of On-NIC Network Functions with Multi-Resource Contention and Traffic Awareness</a>”, ASPLOS 2025
</p>
</li>
<li><p>“<a href="share/jiamin-atc23.pdf" target=”blank“>Accelerating Distributed MoE Training and Inference with Lina</a>”, USENIX ATC 2023
</p>
</li>
<li><p>“<a href="https://dl.acm.org/doi/10.1145/3552326.3587445" target=”blank“>Lyra: Elastic Scheduling for Deep Learning Clusters</a>”, ACM EuroSys 2023
</p>
</li>
<li><p>“<a href="https://dl.acm.org/doi/abs/10.1145/3544216.3544244" target=”blank“>Software-defined Network Assimilation: Bridging the Last Mile Towards Centralized Network Configuration Management with NAssim</a>”, ACM SIGCOMM 2022 (Best Paper Award)
</p>
</li>
</ul>
<h2>Prospective Students and Current Openings</h2>
<p><b>[04/2026]</b> I am looking for <b>PhD students</b> starting in fall 2027. The early admissions exercise has begun and deadline of first-round intake is <b>May 12, 2026</b>. See <a href="join.html" target=“blank”>here</a> for more details.
</p>
<p><b>[05/2026]</b> I am looking for a <b>Research assistant</b> starting asap. See <a href="join.html" target=“blank”>here</a> for more details.
</p>
<h2>News</h2>
<ul>
<li><p>07/2026. <a href="http://arxiv.org/abs/2412.12487" target=“blank”>Echo</a> accepted to <a href="https://sc26.supercomputing.org/" target=“blank”>SC’26</a>! Congrats to Yicheng and the team!
</p>
</li>
<li><p>06/2026. Serving on the PC of <a href="https://www.usenix.org/conference/osdi27" target=“blank”>OSDI’27</a>. Please submit!
</p>
</li>
<li><p>06/2026. We open source <a href="https://github.com/NetX-lab/Frontier" target=“blank”>Frontier</a>, our simulator for modern LLM serving.
</p>
</li>
<li><p>06/2026. We open source <a href="https://github.com/NetX-lab/NetOpsBench" target=“blank”>NetOpsBench</a>! Try it out and let us know what you think.
</p>
</li>
<li><p>05/2026. <a href="." target=“blank”>Silverstone</a> accepted to <a href="https://conferences.sigcomm.org/sigcomm/2026/" target=“blank”>SIGCOMM’26</a>! Congrats to Xin and Yicheng!
</p>
</li>
<li><p>05/2026. <a href="https://www.usenix.org/conference/nsdi26/presentation/wu-shaofeng" target=“blank”>SmartSwitch</a> paper received the <a href="https://www.usenix.org/conference/nsdi26" target=“blank”>NSDI’26</a> Community Award!
</p>
</li>
<li><p>05/2026. <a href="https://arxiv.org/abs/2601.17261" target=“blank”>AGZO</a>, <a href="https://arxiv.org/abs/2601.23278" target=“blank”>FOCUS</a>, <a href="." target=“blank”>UniScale</a> accepted to ICML’26! Congrats to Wei, Kaihua, Xin, and the team!
</p>
</li>
<li><p>04/2026. <a href="https://arxiv.org/abs/2507.21433" target=“blank”>ReasonCache</a> accepted to IWQoS’26, and <a href="." target=“blank”>Matt</a> to APNet’26! Congrats to Kaiwen and Jianqiang!
</p>
</li>
<li><p>03/2026. <a href="." target=“blank”>POEGA</a> accepted to <a href="https://www.usenix.org/conference/osdi26" target=“blank”>OSDI’26</a>! Congrats to Yunmo!
</p>
</li>
<li><p>03/2026. Gave a talk on <a href="https://datatracker.ietf.org/meeting/125/materials/slides-125-irtfopen-reliability-engineering-challenges-in-networking-for-ai-00" target=“blank”>reliability engineering in AI infra</a> at the <a href="https://datatracker.ietf.org/meeting/125/session/irtfopen" target=“blank”>IRTF open meeting</a> as part of <a href="https://www.ietf.org/meeting/125/" target=“blank”>IETF-125</a>.
</p>
</li>
<li><p>02/2026. Gave a keynote on AI infra at <a href="https://nines-conference.org/pods/hk" target=“blank”>NINeS 2026 HKUST pod</a> and <a href="https://vistec.ac.th/news-events/events/123" target=“blank”>Secure & Scalable Machine Learning Symposium 2026</a> at Thailand.
</p>
</li>
<li><p>01/2026. <a href="share/yuetao-mlsys26.pdf" target=“blank”>PRISM</a> accepted to <a href="https://mlsys.org/" target=“blank”>MLSys’26</a>! Congrats to Yuetao!
</p>
</li>
<li><p>01/2026. Serving as PC members for IEEE ICDCS and APNet, publicity chair for IWQoS, and area chair for ACL ARR 2026 January.
</p>
</li>
<li><p>12/2025. <a href="." target=“blank”>TSGuard</a> accepted to <a href="https://conf.researchr.org/home/fse-2026" target=“blank”>FES’26</a>! Congrats to Yitao, Yangtao, and all collaborators at Microsoft!
</p>
</li>
<li><p>12/2025. Serving as an associate editor for <a href="https://dl.acm.org/journal/tocs" target=“blank”>ACM Transactions on Computer Systems</a>. Please submit!
</p>
</li>
<li><p>12/2025. <a href="." target=“blank”>SmartSwitch</a> accepted to <a href="https://www.usenix.org/conference/nsdi26" target=“blank”>NSDI’26</a>! Congrats to Shaofeng and all collaborators at Microsoft!
</p>
</li>
<li><p>12/2025. Serving on the PC of <a href="https://conferences.sigcomm.org/sigcomm/2026/" target=“blank”>SIGCOMM’26</a>. Please submit!
</p>
</li>
</ul>
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