CORGi: Computer Organization Research Group @ CMU

Welcome to CORGi!

We are working on many interesting projects. Meet the people who make it happen, and read our publications.

Current Projects

• Near-Data Dataflow Architectures
• Polymorphic Memory Hierarchy
• Energy-Minimal Programable Architectures for Intelligence Beyond the Edge
• Smart Caching Systems in the Datacenter

Recent Research Highlights

• RipTide: A programmable, energy-minimal dataflow compiler and architecture
• täkō: A Polymorphic Cache Hierarchy for General-Purpose Optimization of Data Movement
• Kangaroo: Caching Billions of Tiny Objects on Flash

News (yyyy-mm-dd)

2024

• 2024-03-29: Congrats to Sara on her paper on carbon emissions (with Harsh Desai and Brandon Lucia) at HotEthics workshop co-located w ASPLOS’24.
• 2024-02-20: Nathan is a Sloan Research Fellow.

2023

• 2023-12-08: Baleen: ML Admission & Prefetching for Flash Caches, a collaboration with PDL and Meta, was accepted to appear at FAST’24.
• 2023-10-04: UDIR: Towards a Unified Compiler Framework for Reconfigurable Dataflow Architectures by Nikhil, Mitchell, Souradip, and Brian will appear at WDDSA @ MICRO’23 and IEEE Computer Architecture Letters.
• 2023-08-28: Sara was accepted at EECS Rising Stars!
• 2023-07-24: Pipestitch: An energy-minimal dataflow architecture with lightweight threads by CORGi members Nathan Serafin and Souradip, with co-authors Harsh and Brandon, will appear at MICRO’23! Nathan also co-authored a paper with Zhengrong Wang and Tony Nowatzki.
• 2023-07-03: Brian defended his PhD thesis! Go Brian!
• 2023-05-12: Immensely proud to hood Graham, CORGi’s first graduated PhD student! Joyfully co-advised by Brandon Lucia.
• 2023-04-04: Kobold: Simplified Cache Coherence for Cache-Attached Accelerators will appear in IEEE Computer Architecture Letters.
• 2023-03-29: Congrats to Jennifer for receiving the NSF Graduate Research Fellowship!
• 2023-02-23: Congrats to Xuesi on her paper Dataflow Blocks: Modular Time-Multiplexing for CGRAs at YArch’23 workshop!
• 2023-01-20: A paper describing the MANIC testchip got accepted to ISCAS’23. Collaboration with Oguz Atli, Ken Mai, and Brandon Lucia in ECE.
• 2023-01-10: Sara and co-authors won Best Paper at SIGCSE’23 for CS-JEDI: Required DEI Education, by CS PhD Students, for CS PhD Students. Congrats, and very well deserved!

2022

• 2022-12-19: Nikhil and Mitchell’s abstract on Reconfigurable dataflow architectures in the post-Moore era was selected for a full proposal at the Qualcomm Innovation Fellowship!
• 2022-09-09: Kobold will also appear in the Student Research Competition at MICRO’22. Congrats Jennifer!
• 2022-09-08: Kobold: Simplified Cache Coherence for Cache-Attached Accelerators, a project led by visiting undergraduate researcher Jennifer Brana, will appear at the 1st Workshop on Democratizing Domain-Specific Accelerators (WDDSA) at MICRO-22. Congrats Jennifer and Brian!
• 2022-09-01: CORGi welcomes new PhD students Xuesi and Mitchell.
• 2022-08-04: Binghamtom University wrote a nice article about Jennifer Seibert’s work on täkō.
• 2022-07-19: RipTide: A programmable, energy-minimal dataflow compiler and architecture will appear at MICRO’22. Congrats Graham and Souradip!
• 2022-07-11: Graham defended his PhD thesis! Woohoo!
• 2022-07-08: Posted Brian’s talk about täkō from ISCA’22 to YouTube.
• 2022-05-28: Spatial Locality and Granularity Change in Caching (collab w/ Charles McGuffey and Phil Gibbons) will appear as a Brief Announcement at SPAA’22 and a full paper is on arXiv.
• 2022-05-23: An extended paper on Kangaroo will appear in ACM Transactions on Storage.
• 2022-05-06: täkō was nominated for a Best Paper award at ISCA’22.
• 2022-05: Nathan visited Washington, Cornell, Stanford, MIT, and Georgia Tech to talk about Re-Thinking the Hardware-Software Interface for Data-Centric Systems.
• 2022-04-02: Nathan gave a talk at the 2nd Principles of Memory Hierarchy Optimization workshop (PMHO @ PPOPP’22).
• 2022-04-01: Congrats to Sara (and others) on receiving the CMU Graduate Student Service Award for developing the new course 15-996 CS-JEDI: Justice, Equity, Diversity, and Inclusion!
• 2022-03-02: täkō will appear at ISCA’22. Congrats Brian!

2021

• 2021-10-26: Kangaroo won a Best Paper Award at SOSP’21!
• 2021-09-01: CORGi welcomes new PhD students Nikhil and Souradip.
• 2021-08-06: Kangaroo: Caching Billions of Tiny Objects on Flash will appear at SOSP’21. Congrats Sara, and shout out to our PDL and Facebook collaborators.
• 2021-04-20: Sara got the NDSEG fellowship too. Wow!
• 2021-04-18: Block-Granularity-Aware Caching (collab w/ Charles McGuffey and Phil Gibbons) will appear as a Brief Announcement at SPAA’21.
• 2021-04-05: Nathan wrote a SIGARCH blog post about the Programmable Memory Hierarchy project.
• 2021-03-23: Sara received a NSF Graduate Research Fellowship. Go Sara!
• 2021-03-10: Nathan got a Google Research Scholar Award.
• 2021-03-04: Sara presented her work on Kangaroo: Caching Billions of Tiny Objects on Flash at the Cache@Scale meetup. (Collab w/ Greg Ganger and others at PDL.)
• 2021-03-04: SNAFU: An Ultra-Low-Power, Energy-Minimal CGRA-Generation Framework and Architecture will appear at ISCA’21. Congrats Graham!
• 2021-02-28: Nathan gave a talk at the Principles of Memory Hierarchy Optimization workshop (PMHO @ PPOPP’21).
• 2021-02-01: A short paper on The Role of Edge Offload for Hardware-Accelerated Mobile Devices with Satya, Grace, and Brandon will appear at HotMobile’21.

2020

• 2020-08-15: Our paper with Facebook on their CacheLib system will appear at OSDI’20. Congrats Sara, as well as all our PDL and Facebook collaborators!
• 2020-07-07: Jumanji will appear at MICRO’20. Congrats Brian!
• 2020-07-01: Graham was named an Apple Scholar in AI/ML. Congrats Graham!
• 2020-03-04: Tvarak (collab w/ Rajat Kateja and Greg Ganger) will appear at ISCA’20.
• 2020-01-08: Writeback-Aware Caching (collab w/ Charles McGuffey and Phil Gibbons) won Best Paper at APoCS’20. Congrats Charlie!

2019

• 2019-11-19: Livia will appear at ASPLOS’20.
• 2019-10-22: Writeback-Aware Caching will appear at APoCS’20.
• 2019-10-20: CORGi and Abstract organized a workshop on energy-harvesting embedded systems at OurCS (see Outreach).
• 2019-10-16: CMU was out in force at MICRO’19, including five CORGi members. Graham presented MANIC, and Anurag presented PHI.
• 2019-09-01: CORGi welcomes new PhD students Mohammad and Sara.
• 2019-07-25: MANIC and PHI will appear at MICRO’19.
• 2019-06-24: Charlie McGuffey presented a Brief Announcement on Writeback-Aware Caching at SPAA’19.
• 2019-06-23: Nathan gave a talk on Learning Better Caching Policies Online at ML for Systems @ ISCA’19.
• 2019-06-21: Nathan received a NSF CAREER Award.
• 2019-05-01: Nathan presented our work on SONIC and MANIC to the DAWN group at Stanford.
• 2019-04-11: Graham presented SONIC at ASPLOS’19.
• 2019-04-11: Brian received a NSF Graduate Research Fellowship.
• 2019-02-28: CORGi received a Google Faculty Research Award for Learning Better Caching Policies Online.

2018

• 2018-11-07: SONIC will appear at ASPLOS’19.
• 2018-10-22: Anurag presented HATS at MICRO’18.
• 2018-09-19: Nathan gave a talk on Teaching an Old Cache New Tricks at Google Sunnyvale.
• 2018-07-18: HATS will appear at MICRO’18.
• 2018-06-20: Daniel Berger presented Practical Bounds on Caching with Variable Object Sizes at SIGMETRICS’18.
• 2018-04-27: FOO will appear at SIGMETRICS’18.
• 2018-01-17: Graham presented a poster on Intermittent Deep Neural Network Inference at SysML’18.

2017

• 2017-12-11: LHD will appear at NSDI’18.
• 2017-09-01: CORGi welcomes new PhD students Brian, Elliot, and Graham.
• 2017-06-01: Cache-Guided Scheduling will appear at the Architectures for Graph Processing workshop at ISCA’17.
• 2017-05-25: Nexus will appear at PACT’17.
• 2017-03-07: Jenga will appear at ISCA’17.
• 2017-02-15: CORGi received a Google Faculty Research Award for Improving WebScale Cache Performance through Adaptive Policies.
• 2017-02-06: Nathan presented Maximizing Cache Performance Under Uncertainty at HPCA’17.
• 2017-01-01: CORGi founded. And so it begins…

Past Projects

• Software-Defined Memory Hierarchy