Ratul Mahajan @ratulm
I SEE (study, engineer, educate) computer networks. Tweets are facts; retweets are alternative facts ratul.org Joined May 2008-
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@vishalmisra @anand_raj That’s a great Modelo commercial!
The Times did a nice piece on @om: nytimes.com/2026/06/26/tec…
@om passed away yesterday. I'll remember him as a dear friend, a fellow coffee lover, a most original voice in tech writing, and a mentor who always shared his opinion but never enforced it. I love this picture of him.
@vishalmisra @om He would have loved that :(
@om passed away yesterday. I'll remember him as a dear friend, a fellow coffee lover, a most original voice in tech writing, and a mentor who always shared his opinion but never enforced it. I love this picture of him.
@vishalmisra @om Heart issues. He was on the transplant list but one didn't become available in time.
Rituals are silly, but fun too. Here are @arvind_uw and I hooding our PhD student, @xiangfeng_zhu. His thesis showed how to design and implement networks that are hyper-customized to applications' needs rather than requiring applications to work around whatever the network stack happens to provide. He is now off to help machines think at Thinking Machines. Good luck, Xiangfeng!
@JeffDean @uwcse @MBalazinska Thank you for sharing your story and the lessons with our graduates. The contrast between the constant movement of your life growing up and the stability of your professional life is fascinating.
This feature make no sense. With Replit ("Turn ideas into apps in minutes — no coding needed"), shouldn't the CEO be able to build the app themself?
Replit and @databricks integration just leveled up. Build apps where every user sees only what they should. Your HR analyst can build a full org view for the CEO without ever accessing the underlying data. Public preview is open for sign up! Read more →
We wrapped up the LLM systems reliability seminar last week and learned about a lot of cool ideas and tricks. What struck me most though: many ideas felt not relevant to current practice despite being only 3-4 years old. A short summary deck: docs.google.com/presentation/d…
UW systems seminar this quarter is focusing on building reliable systems using LLMs. If you want to follow along, see docs.google.com/document/d/1F2…
James Hamilton is who infra engineers want to be when they grow up. So great to see RNG getting a shout out from him. perspectives.mvdirona.com/2026/06/flat-d…
new paper explainer! a network problem sat unsolved for a decade because the fix needed 80× more memory than the hardware has. the solve is running in prod now! arXiv link ↓
Amazon unveiled “Resilient Network Graphs,” (RNG) a data center network that reduces hardware needs by 69% and raises throughput by 33%. It is now default for most AWS workloads. They revealed that it has been quietly deploying the design across its data centers since last year, and it is now the default data center network for most AWS workloads. It replaced tree-shaped datacenter networks with flatter random ones that waste less capacity. For decades, fat-tree networks worked because they were predictable, but their layered shape can concentrate traffic at choke points while other links sit underused. So the problem is that fat-tree networks are easy to run, but their hierarchy can trap traffic on a few links while other links sit unused. “Resilient Network Graphs,” (RNG) fixes this by connecting routers in a flat quasi-random graph, so many different paths exist between servers instead of a few fixed routes through upper layers. RNG attacks the problem by flattening the fabric into a quasi-random graph, where many small independent paths replace a few privileged routes. Its routing system, Spraypoint, spreads traffic across many separate paths, while its ShuffleBox cabling device makes the random-looking wiring practical to build and expand. Instead of asking every packet to chase the shortest path, Spraypoint fans traffic outward and then guides it back through distributed waypoints, creating many edge-disjoint paths without requiring exotic switch memory. The authors tested RNG in 2 real Amazon production fabrics and compared it with fat-tree networks using transport and storage workloads. The main result is that RNG matched fat-tree application performance, found far more separate paths than common routing methods, and was estimated to cost 9% to 45% less. The hard part is not the idea, but the engineering, because routing in a random mesh needs smarter path selection and the physical system must manage millions of fiber connections without becoming impossible to operate. This is important for AI clusters because training traffic is huge, synchronized, and sensitive to congestion, so a network that spreads load better can make expensive GPUs spend less time waiting. ---- Link – arxiv. org/abs/2604.15261 Title: "RNG: Flat Datacenter Networks at Scale"
@BenjDicken Thanks for the shoutout. Giacomo is here as @mino98; he prefers to just lurk. (Sorry that I outed you, Giacomo.)
Combining deep math theory with practical implementation leads to many cool things. This is the heart-and-soul of computer science and engineering. AWSs latest blog is a beautiful example, describing and visualizing the transformation from tree-based networks to pseudo-random graphs in their DCs. Props to @ratulm and the other authors (who need to get on X dot com ASAP)
Most people thought flat data center networks would never work at hyperscale. The @awscloud team figured it out. Resilient Network Graphs are a completely new network architecture, now live. 33% better throughput, 40% less network power. aboutamazon.com/stories/aws-ra…
A passive optical device called a ShuffleBox and a routing protocol called Spraypoint just made flat datacenter networks as practical as fat trees, with 69% fewer routers and up to 33% better throughput. amzn.to/4uIdylW
Look, Ma, no more trees! wired.com/story/amazon-t…
billions of packets @justinesherry
10K Followers 2K Following Computer person. I like middleboxes, systems, and Internets. Assistant Prof @ AS9. she/her, [email protected], @[email protected], 🇺🇲❤️🇵🇹
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Shriram Krishnamurthi... @ShriramKMurthi
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billions of packets @justinesherry
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Jennifer Rexford @jrexnet
4K Followers 734 Following Provost @Princeton, Professor @PrincetonCS and @EPrinceton, affiliated with @PrincetonCITP, computer networking researcher, and mom. 🏳️🌈
Shriram Krishnamurthi... @ShriramKMurthi
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Georgios Smaragdakis @GSmaragdakis
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2K Followers 1K Following Asst. CS Prof. @umdcs, @umiacs. Scalable Systems, Verifiable Intelligence. Previously @bu_ece, @CarnegieMellon, @JHUCompSci.
Loris D'Antoni @lorisdanto
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Francis Y. Yan @FrancisYan_
3K Followers 301 Following Assistant Professor at UIUC CS | Previously @MSFTResearch @Stanford | Creator of Puffer (400k users) | Illinois Networked Systems + AI Lab.
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6K Followers 1K Following Watchman in a cornfield @IllinoisCDS @ECEILLINOIS @ACMSIGOPS
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Aaron A. Glenn @networkservice
4K Followers 3K Following "packet processing & packet processing accessories" my tweets are mine alone human rights over property rights. see also discuss . systems at this username
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Marc Andreessen 🇺�... @pmarca
4.5M Followers 32K Following You’re not talking to someone who woke up a loser. That loser attitude, that loser premise makes no sense to me.
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Networking and Intern... @USB
409 Followers 6 Following New Networking and Internet Architecture papers from https://t.co/ub6cIMJJZa: computer communication networks. Thank you to arXiv for use of its open access interoperability.
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90K Followers 3K Following Senior Correspondent @WIRED. DMs open. Send me tips on what's happening in Silicon Valley and beyond on Signal @ ChaoticGoode.12 (no PR pitches there)
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41K Followers 873 Following databases → @planetscale videos → https://t.co/J5soMyfENa writing → https://t.co/YpfkF0JIKG
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Persuasion @JoinPersuasion
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66K Followers 59 Following Student of mind and nature, libertarian, chess player, cancer survivor. @ Keen, UAlberta, Amii, https://t.co/u8za2Kod54, The Royal Society, Turing Award
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311K Followers 3K Following https://t.co/VIQU0kxbhH. ex-white house, a16z and more. pro wrestling fan.
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258K Followers 2K Following Sign up for my new newsletter! (Link below) Also: Co-author of Abundance, host of Plain English, and contributing writer at The Atlantic.
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161 Followers 4K Following cs phd @uwcse, building self-defining systems (https://t.co/g6PsqayZZi). prev @BrownCSDept and @nyuniversity.
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94K Followers 146 Following Building beautiful things like Mojo🔥 and MAX @Modular, lifting the world of production AI/ML software into a new phase of innovation. We’re hiring! 🚀🧠
Mark Cuban @mcuban
8.5M Followers 2K Following Dunking on the pharma industry with @costplusdrugs.com, the lowest prices on meds anywhere. check it out !
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49K Followers 1K Following Author of https://t.co/arW0hnWcIy and https://t.co/RN9xXOzPEl. Working on @ampcode. Writing https://t.co/0SZD6dcj40.
Peter Steinberger �... @steipete
559K Followers 2K Following Polyagentmorous ClawFather. Came back from retirement to mess with AI and help a lobster take over the world. @OpenClaw🦞 + @OpenAI
Minh Pham @buckeyevn
1K Followers 250 Following Founder & CEO @ Continuous. Ex: @uber, Atoms (aka CloudKitchens), CEO @ Invisible, Head of AI Agent Infra @perplexity_ai
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24K Followers 8K Following 🪼 AGI policy/gov & jester @GoogleDeepMind | purveyor of machine funk, dimensional glider, deep ArXiv dweller, interstellar fugitive, very uncertain 🛸
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51K Followers 4K Following Co-founder and CTO of @oxidecomputer. According to @fieldofschemes, "tech exec and Oakland A's fan" -- but more of a Ballers fan now. @bcantrill.bsky.social
Adam Marblestone @AdamMarblestone
11K Followers 7K Following Technologist, Scientist Co-founder and CEO @Convergent_FROs Tweets do not represent employers
Michael Nielsen @michael_nielsen
120K Followers 5K Following Searching for the numinous 🇦🇺 🇨🇦, currently live in 🇺🇸 Research @AsteraInstitute https://t.co/maezekzRUb https://t.co/2dWwZKrvrn
Thomas Massie @RepThomasMassie
1.8M Followers 25K Following U.S. Representative KY4, Engineer, Farmer, Inventor. 30 patents. Appalachian American. MIT SB93 SM96 #sassywithmassie #politicalsciencedenier pronoun: PappawYou might like
