Join us at ASPLOS 2021 online

We are at ASPLOS 2021 this week and next.  Join us for our talks and learn more about our recent works:

Session 2: Memory Systems, Monday, April 19 4:00 PM Pacific Tiime:

Irina Calciu, M. Talha Imran, Ivan Puddu, Sanidhya Kashyap, Hasan Al Maruf, Onur Mutlu, and Aasheesh Kolli,
“Rethinking Software Runtimes for Disaggregated Memory”
Proceedings of the 26th International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), Virtual, March-April 2021.
[2-page Extended Abstract]
[Source Code (Officially Artifact Evaluated)]


Session 8: Tools & Frameworks, Tuesday, April 20 4:00 PM Pacific Time: 

Nastaran Hajinazar, Geraldo F. Oliveira, Sven Gregorio, Joao Dinis Ferreira, Nika Mansouri Ghiasi, Minesh Patel, Mohammed Alser, Saugata Ghose, Juan Gomez-Luna, and Onur Mutlu,
“SIMDRAM: An End-to-End Framework for Bit-Serial SIMD Computing in DRAM”
Proceedings of the 26th International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), Virtual, March-April 2021.
[2-page Extended Abstract]
[Short Talk Slides (pptx) (pdf)]
[Talk Slides (pptx) (pdf)]
[Short Talk Video (5 mins)]
[Full Talk Video (27 mins)]


Session 17: Solid State Drives, Thursday, April 22 7:00 AM Pacific Time:

Jisung Park, Myungsuk Kim, Myoungjun Chun, Lois Orosa, Jihong Kim, and Onur Mutlu,
“Reducing Solid-State Drive Read Latency by Optimizing Read-Retry”
Proceedings of the 26th International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), Virtual, March-April 2021.
[2-page Extended Abstract]
[Short Talk Slides (pptx) (pdf)]
[Full Talk Slides (pptx) (pdf)]
[Short Talk Video (5 mins)]
[Full Talk Video (19 mins)]

 

ASPLOS Program:  https://asplos-conference.org/program/

TRRespass wins the Pwnie Award for Most Innovative Research

TRRespass won the Pwnie Award for “Most Innovative Research” at the annual BlackHat Europe conference this week.  Pwnies are the most prestigious industrial awards in the security community.   Congratulations to the authors: Pietro Frigo, Emanuele Vannacci, Hasan Hassan, Victor van der Veen, Onur Mutlu, Cristiano Giuffrida, Herbert Bos, and Kaveh Razavi on this prestigious prize!

We recently interviewed Hasan Hassan about his contribution to TRRespass.  Here’s what he had to say:

You were a co-author on TRRespass, which recently won a Best Paper Award at IEEE S&P. What is the significance of this paper?

Shortly after the discovery of the RowHammer vulnerability of DRAM, DRAM vendors announced RowHammer-free DRAM devices that implement in-DRAM solutions to protect against RowHammer. However, in TRRespass, we find that such solutions, commonly referred to as Target Row Refresh (TRR), do not effectively protect against RowHammer attacks when many rows are hammered at the same time. We show that the RowHammer vulnerability is not only still intact on the current DDR4 devices, but it has also become worse due to technology node scaling.

How was your experience in collaborating with the Systems and Network Security Group at VU Amsterdam on this work?

I am glad that our combined effort with the Systems and Network Security Group at VU Amsterdam won us the Best Paper Award at IEEE S&P. It has been a great experience for me to collaborate with experts in hardware security. I hope there will be more such collaborations that result in impactful research.

Which tools did you use in this work?

I think SoftMC, our FPGA-based DRAM testing infrastructure, was one of the key enablers of this research. We used SoftMC to interface with DDR4 DRAM chips in a much more flexible way than anyone can do using commodity desktop and mobile systems. Specifically, we used SoftMC to communicate with DRAM chips using low-level DDR4 commands as opposed to using load/store instructions provided by typical instruction set architectures. In a way, SoftMC lets us be the memory controller and provides the flexibility of issuing any DDR4 command at any time, which is not possible with commodity systems.

An earlier version of SoftMC that supports DDR3 devices is open-source and can be accessed here. In 2017, we published a paper that describes the design of SoftMC in detail.

I am also involved in maintaining Ramulator, a cycle-accurate DRAM simulator that we describe in this paper, and Scarab, which is a cycle-accurate simulator for state-of-the-art multicore CPUs.


Pietro Frigo, Emanuele Vannacci, Hasan Hassan, Victor van der Veen, Onur Mutlu, Cristiano Giuffrida, Herbert Bos, and Kaveh Razavi, “TRRespass: Exploiting the Many Sides of Target Row Refresh”Proceedings of the 41st IEEE Symposium on Security and Privacy (S&P), San Francisco, CA, USA, May 2020.
Slides (pptx) (pdf)
Lecture Slides (pptx) (pdf)
Talk Video (17 minutes)
Lecture Video (59 minutes)
Source Code
Web Article
Project Overview
Best paper award.
Pwnie Award 2020 for Most Innovative Research. Pwnie Awards 2020

Paper: SneakySnake🐍: A Fast and Accurate Universal Genome Pre-Alignment Filter for CPUs, GPUs, and FPGAs

Our recent paper is accepted in Bioinformatics!

Mohammed Alser, Taha Shahroodi, Juan-Gomez Luna, Can Alkan, and Onur Mutlu,
“SneakySnake: A Fast and Accurate Universal Genome Pre-Alignment Filter for CPUs, GPUs, and FPGAs”
Bioinformatics, to appear in 2020.

Source Code:  SneakySnake🐍: A Fast and Accurate Universal Genome Pre-Alignment Filter for CPUs, GPUs, and FPGAs

We are at MICRO 2020 this week! Join Lois Orosa for his talk on FIGARO, Monday, October 19 6:30PM CEST

Our new paper: FIGARO: Improving System Performance via Fine-Grained In-DRAM Data Relocation and Caching will be presented by Lois Orosa at MICRO 2020 on Monday, October 19 at 6:30 PM CEST.  Join us at MICRO 2020 online!

Authors: Yaohua Wang, Lois Orosa, Xiangjun Peng, Yang Guo, Saugata Ghose, Minesh Patel, Jeremie S. Kim, Juan Gómez Luna, Mohammad Sadrosadati, Nika Mansouri Ghiasi, and Onur Mutlu

Proceedings of the 53rd International Symposium on Microarchitecture (MICRO), Virtual, October 2020.
[Slides (pptx) (pdf)]
[Lightning Talk Slides (pptx) (pdf)]
[Talk Video (16 minutes)]
[Lightning Talk Video (1.5 minutes)]

Best Paper Award MICRO 2020: Congratulations Minesh Patel and co-authors!

Our new paper: Bit-Exact ECC Recovery (BEER): Determining DRAM On-Die ECC Functions by Exploiting DRAM Data Retention Characteristics  will be presented by Minesh Patel at MICRO 2020 on Monday, October 19 at 6:00 PM CEST.  Join us at MICRO 2020 online!

Update: This paper won the Best Paper Award!  Congratulations to Minesh Patel and co-authors: Jeremie S. Kim, Taha Shahroodi, Hasan Hassan, and Onur Mutlu,

We asked Minesh a couple questions about his paper, here’s what he had to say:

You recently won the Best Paper Award at MICRO.  Can you tell us more about the
significance of this paper?
This paper addresses the larger problem that hidden proprietary features
implemented by DRAM manufacturers impede end-users from bringing out the best of
DRAM technology. We believe BEER takes an important step towards bridging the
gap between industry and end-users, starting by focusing on a key example of
such features: on-die ECC. Our work discusses how and why on-die ECC limits
third-party DRAM consumers and then introduces techniques that the consumers can
use to overcome these limitations.

What were the biggest challenges for you during the writing and review process?I would say that the biggest challenge we faced when writing this paper was to
clearly articulate the problem of on-die ECC limiting third-party users. This
includes both (i) describing how and why this limitation arises and (ii)
providing concrete examples that the reader can relate to. We spent considerable
effort in crafting these arguments such that both we and the reader have a clear
understanding of the problem we tackle, our goal in this work, and the final
value of our contributions.

Proceedings of the 53rd International Symposium on Microarchitecture (MICRO), Virtual, October 2020.
[Slides (pptx) (pdf)]
[Short Talk Slides (pptx) (pdf)]
[Lightning Talk Slides (pptx) (pdf)]
[Talk Video (15 minutes)]
[Short Talk Video (5.5 minutes)]
[Lightning Talk Video (1.5 minutes)]
[BEER Source Code]