CMU CAOS | Computer Architecture and Operating Systems Group at CMU

The CAOS group at CMU bridges computer architecture and operating systems
and rethinks their synergy for performance, security, and scalability

Computing systems are undergoing a radical shift, propelled by stern security requirements and an unprecedented growth in data and users. This change has proven to be abstraction breaking. Current hardware and operating system abstractions and interfaces were built at a time when we had minimal security threats, scarce compute and memory resources, and limited numbers of users. These assumptions are not representative of today's computing landscape. On one hand, modern virtualization technologies have enabled the new cloud paradigms of serverless computing and microservices, which have in turn lead to the sharing of computing resources among hundreds of users. On the other hand, attacks such as Spectre and Meltdown have shown that current hardware is plagued by critical vulnerabilities. In this new era of computing, it is urgent that we rethink the synergy between the OS and hardware layers from scratch. Our research at CAOS bridges computer architecture and operating systems focusing on performance, security, and scalability. Our current work follows two central themes: (a) re-designing abstractions and interfaces between the two layers to improve performance and scalability, and (b) uncovering security vulnerabilities and building defenses at the boundary between hardware and OS.

The CAOS group at CMU bridges computer architecture and operating systems and rethinks their synergy for performance, security, and scalability

Cinnamon accepted at ASPLOS 2025!

Dimitrios received the Intel Rising Star Faculty Award!

Dimitrios received the Linux and eBPF Foundation Faculty Award!

Eliot and Vasilis join the CAOS group!

Kaiyang and Hilbert (Yuang) win the Qualcomm Innovation Fellowship 2024!

Perspective accepted at ISCA 2024!

Contiguitas selected as an IEEE MICRO Top Picks!

David Rudo selected for the CRA Outstanding Undergraduate Research Honorable Mention!

Hilbert joins the CAOS group!

Memento accepted at MICRO 2023!

Two papers, Siloz, and XFaaS, accepted at SOSP 2023!

Contiguitas won the best paper ISCA 2023!

Contiguitas accepted at ISCA 2023!

ServiceRouter accepted at OSDI 2023!

Dimitrios received the NSF CAREER Award!

IOCost selected as an IEEE MICRO Top Picks!

Memory Efficent Hashed Page Tables accepted at HPCA 2023!

Siddharth and Patrick join the CAOS group!

Dimitrios received three Meta research awards to improve datacenter computing systems!

TMO won the best paper award at ASPLOS 2022!

Three papers, IOCost, TMO, and Nested ECPTs, accepted at ASPLOS 2022!

Dimitrios selected as a Meta Academic of the Month!

Dimitrios received a Meta Faculty Award!

Dimitrios received the David J. Kuck Outstanding Ph.D. Thesis Award!

RAS accepted at SOSP 2021!

Dimitrios received the ACM SIGARCH & IEEE CS TCCA Outstanding Dissertation Award!

NVOverlay accepted at ISCA 2021!

Kaiyang and Ziqi join the CAOS group!

BabelFish selected as an IEEE MICRO Top Picks!

Elastic Cuckoo Page Tables selected as a a MICRO Top Picks Honarable Mention!

The upstreamed Draco is featured in Linux Security at Phoronix!

Jamais Vu accepted at ASPLOS 2021!

Draco has been upstreamed in the Linux Kernel!

CAOS Group Established!

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The CAOS group at CMU bridges computer architecture and operating systems
and rethinks their synergy for performance, security, and scalability