publications

2022

  1. Understanding modern storage APIs: a systematic study of libaio, SPDK, and io_uring
    Diego Didona, Jonas Pfefferle, Nikolas Ioannou, Bernard Metzler, and Animesh Trivedi
    SYSTOR ’22: The 15th ACM International Systems and Storage Conference, Haifa, Israel, June 13 - 15, 2022
  2. An Elastic Ephemeral Datastore using Cheap, Transient Cloud Resources
    Malte Brodmann, Nikolas Ioannou, Bernard Metzler, Jonas Pfefferle, and Ana Klimovic
    CoRR, 2022

2021

  1. Towards a General Framework for ML-based Self-tuning Databases
    Thomas Schmied, Diego Didona, Andreas C. Döring, Thomas P. Parnell, and Nikolas Ioannou
    EuroMLSys@EuroSys 2021, Proceedings of the 1st Workshop on Machine Learning and Systemsg Virtual Event, Edinburgh, Scotland, UK, 26 April, 2021
  2. How to efficiently provide software-defined storage using SmartNICs
    Jonas Pfefferle, Nikolas Ioannou, Jose Castanos, and Bernard Metzler
    2021 Open Fabrics Alliance Virtual Workshop

2020

  1. Toward a Better Understanding and Evaluation of Tree Structures on Flash SSDs
    Diego Didona, Nikolas Ioannou, Radu Stoica, and Kornilios Kourtis
    Proc. VLDB Endow., 2020
  2. Open Block Characterization and Read Voltage Calibration of 3D QLC NAND Flash
    Nikolaos Papandreou, Haralampos Pozidis, Nikolas Ioannou, Thomas P. Parnell, Roman A. Pletka, Milos Stanisavljevic, Radu Stoica, Sasa Tomic, Patrick Breen, Gary A. Tressler, Aaron Fry, Timothy Fisher, and Andrew Walls
    2020 IEEE International Reliability Physics Symposium, IRPS 2020, Dallas, TX, USA, April 28 - May 30, 2020
  3. Improving NAND flash performance with read heat separation
    Roman A. Pletka, Nikolaos Papandreou, Radu Stoica, Haris Pozidis, Nikolas Ioannou, Tim Fisher, Aaron Fry, Kip Ingram, and Andrew Walls
    28th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems, MASCOTS 2020, Nice, France, November 17-19, 2020
  4. SnapBoost: A Heterogeneous Boosting Machine
    Thomas P. Parnell, Andreea Anghel, Malgorzata Lazuka, Nikolas Ioannou, Sebastian Kurella, Peshal Agarwal, Nikolaos Papandreou, and Haralampos Pozidis
    Advances in Neural Information Processing Systems 33: Annual Conference on Neural Information Processing Systems 2020, NeurIPS 2020, December 6-12, 2020, virtual
  5. Safe and Efficient Remote Application Code Execution on Disaggregated NVM Storage with eBPF
    Kornilios Kourtis, Animesh Trivedi, and Nikolas Ioannou
    CoRR, 2020
  6. Compiling Neural Networks for a Computational Memory Accelerator
    Kornilios Kourtis, Martino Dazzi, Nikolas Ioannou, Tobias Grosser, Abu Sebastian, and Evangelos Eleftheriou
    CoRR, 2020
  7. Toward a Better Understanding and Evaluation of Tree Structures on Flash SSDs
    Diego Didona, Nikolas Ioannou, Radu Stoica, and Kornilios Kourtis
    CoRR, 2020
  8. MixBoost: A Heterogeneous Boosting Machine
    Thomas P. Parnell, Andreea Anghel, Malgorzata Lazuka, Nikolas Ioannou, Sebastian Kurella, Peshal Agarwal, Nikolaos Papandreou, and Haralampos Pozidis
    CoRR, 2020
  9. Towards a General Framework for ML-based Self-tuning Databases
    Thomas Schmied, Diego Didona, Andreas C. Döring, Thomas P. Parnell, and Nikolas Ioannou
    CoRR, 2020

2019

  1. Deep learning acceleration based on in-memory computing
    Evangelos Eleftheriou, Manuel Le Gallo, S. R. Nandakumar, Christophe Piveteau, Irem Boybat, Vinay Joshi, Riduan Khaddam-Aljameh, Martino Dazzi, Iason Giannopoulos, Geethan Karunaratne, Benedikt Kersting, Milos Stanisavljevic, Vara Prasad Jonnalagadda, Nikolas Ioannou, Kornilios Kourtis, Pier Andrea Francese, and Abu Sebastian
    IBM J. Res. Dev., 2019
  2. Reaping the performance of fast NVM storage with uDepot
    Kornilios Kourtis, Nikolas Ioannou, and Ioannis Koltsidas
    17th USENIX Conference on File and Storage Technologies, FAST 2019, Boston, MA, February 25-28, 2019
  3. Characterization and Analysis of Bit Errors in 3D TLC NAND Flash Memory
    Nikolaos Papandreou, Haralampos Pozidis, Thomas P. Parnell, Nikolas Ioannou, Roman A. Pletka, Sasa Tomic, Patrick Breen, Gary A. Tressler, Aaron Fry, and Timothy Fisher
    IEEE International Reliability Physics Symposium, IRPS 2019, Monterey, CA, USA, March 31 - April 4, 2019
  4. Understanding the Design Trade-Offs of Hybrid Flash Controllers
    Radu Stoica, Roman A. Pletka, Nikolas Ioannou, Nikolaos Papandreou, Sasa Tomic, and Haris Pozidis
    27th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems, MASCOTS 2019, Rennes, France, October 21-25, 2019
  5. Accelerated ML-Assisted Tumor Detection in High-Resolution Histopathology Images
    Nikolas Ioannou, Milos Stanisavljevic, Andreea Anghel, Nikolaos Papandreou, Sonali Andani, Jan Hendrik Rüschoff, Peter Wild, Maria Gabrani, and Haralampos Pozidis
    Medical Image Computing and Computer Assisted Intervention - MICCAI 2019 - 22nd International Conference, Shenzhen, China, October 13-17, 2019, Proceedings, Part I
    Spotlight paper award
  6. SySCD: A System-Aware Parallel Coordinate Descent Algorithm
    Nikolas Ioannou, Celestine Mendler-Dünner, and Thomas P. Parnell
    Advances in Neural Information Processing Systems 32: Annual Conference on Neural Information Processing Systems 2019, NeurIPS 2019, December 8-14, 2019, Vancouver, BC, Canada
    Spotlight paper award
  7. Reliability of 3D NAND flash memory with a focus on read voltage calibration from a system aspect
    Nikolaos Papandreou, Nikolas Ioannou, Thomas P. Parnell, Roman A. Pletka, Milos Stanisavljevic, Radu Stoica, Sasa Tomic, and Haralampos Pozidis
    19th Non-Volatile Memory Technology Symposium, NVMTS 2019, Durham, NC, USA, October 28-30, 2019
  8. Breadth-first, Depth-next Training of Random Forests
    Andreea Anghel, Nikolas Ioannou, Thomas P. Parnell, Nikolaos Papandreou, Celestine Mendler-Dünner, and Haris Pozidis
    CoRR, 2019
  9. SySCD: A System-Aware Parallel Coordinate Descent Algorithm
    Nikolas Ioannou, Celestine Mendler-Dünner, and Thomas P. Parnell
    CoRR, 2019
  10. Key-Value Store and NVMe Deliver Close to DRAM Performance
    Nikolas Ioannou, Kornilios Kourtis, Radu Stoica, Josh Mintz, and Haris Pozidis
    Flash Memory Summit 2019, Santa Clara

2018

  1. FlashNet: Flash/Network Stack Co-Design
    Animesh Trivedi, Nikolas Ioannou, Bernard Metzler, Patrick Stuedi, Jonas Pfefferle, Kornilios Kourtis, Ioannis Koltsidas, and Thomas R. Gross
    ACM Trans. Storage, 2018
  2. Management of Next-Generation NAND Flash to Achieve Enterprise-Level Endurance and Latency Targets
    Roman A. Pletka, Ioannis Koltsidas, Nikolas Ioannou, Sasa Tomic, Nikolaos Papandreou, Thomas P. Parnell, Haralampos Pozidis, Aaron Fry, and Tim Fisher
    ACM Trans. Storage, 2018
  3. Elevating Commodity Storage with the SALSA Host Translation Layer
    Nikolas Ioannou, Kornilios Kourtis, and Ioannis Koltsidas
    26th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems, MASCOTS 2018, Milwaukee, WI, USA, September 25-28, 2018
    Best paper candidate
  4. Snap ML: A Hierarchical Framework for Machine Learning
    Celestine Dünner, Thomas P. Parnell, Dimitrios Sarigiannis, Nikolas Ioannou, Andreea Anghel, Gummadi Ravi, Madhusudanan Kandasamy, and Haralampos Pozidis
    Advances in Neural Information Processing Systems 31: Annual Conference on Neural Information Processing Systems 2018, NeurIPS 2018, December 3-8, 2018, Montréal, Canada
  5. Elevating commodity storage with the SALSA host translation layer
    Nikolas Ioannou, Kornilios Kourtis, and Ioannis Koltsidas
    CoRR, 2018
  6. Snap ML: A Hierarchical Framework for Machine Learning
    Celestine Dünner, Thomas P. Parnell, Dimitrios Sarigiannis, Nikolas Ioannou, Andreea Anghel, and Haralampos Pozidis
    CoRR, 2018
  7. Parallel training of linear models without compromising convergence
    Nikolas Ioannou, Celestine Dünner, Kornilios Kourtis, and Thomas P. Parnell
    CoRR, 2018
  8. Enabling 3D-TLC NAND Flash in Enterprise Storage Systems
    Roman A. Pletka, Nikolas Ioannou, Nikolaos Papandreou, Thomas P. Parnell, and Sasa Tomic
    ERCIM News, 2018
  9. Designing Enterprise Controllers with QLC 3D NAND
    Roman Pletka, Radu Stoica, Nikolas Ioannou, Sasa Tomic, Nikolaos Papandreou, and Haris Pozidis
    Flash Memory Summit 2018, Santa Clara

2017

  1. Crail: A High-Performance I/O Architecture for Distributed Data Processing
    Patrick Stuedi, Animesh Trivedi, Jonas Pfefferle, Radu Stoica, Bernard Metzler, Nikolas Ioannou, and Ioannis Koltsidas
    IEEE Data Eng. Bull., 2017
  2. FlashNet: flash/network stack co-design
    Animesh Trivedi, Nikolas Ioannou, Bernard Metzler, Patrick Stuedi, Jonas Pfefferle, Ioannis Koltsidas, Kornilios Kourtis, and Thomas R. Gross
    Proceedings of the 10th ACM International Systems and Storage Conference, SYSTOR 2017, Haifa, Israel, May 22-24, 2017
    Best paper award
  3. From random block corruption to privilege escalation: A filesystem attack vector for rowhammer-like attacks
    Anil Kurmus, Nikolas Ioannou, Nikolaos Papandreou, and Thomas P. Parnell
    11th USENIX Workshop on Offensive Technologies, WOOT 2017, Vancouver, BC, Canada, August 14-15, 2017
  4. Improving Endurance in 3D-NAND Flash
    R. Pletka, I. Koltsidas, N. Ioannou, S. Tomic, N. Papandreou, T. Parnell, H. Pozidis, A. Fry, and T. Fisher
    Flash Memory Summit 2017, Santa Clara

2016

  1. On The [Ir]relevance of Network Performance for Data Processing
    Animesh Trivedi, Patrick Stuedi, Jonas Pfefferle, Radu Stoica, Bernard Metzler, Ioannis Koltsidas, and Nikolas Ioannou
    8th USENIX Workshop on Hot Topics in Cloud Computing, HotCloud 2016, Denver, CO, USA, June 20-21, 2016
  2. FlashNet: A Unified High-Performance IO Stack
    Animesh Trivedi, Nikolas Ioannou, Bernard Metzler, Patrick Stuedi, Jonas Pfefferle, Ioannis Koltsidas, and Thomas R. Gross
    Non-Volatile Memories Workshop (NVMW), San Diego, March 2016

2015

  1. SALSA: Treating the Weaknesses of Low-cost Flash in Software
    Nikolas Ioannou, Ioannis Koltsidas, Roman Pletka, Sasa Tomic, Radu Stoica, Thomas Weigold, and Evangelos Eleftheriou
    Non-Volatile Memories Workshop (NVMW), San Diego, March 2015
  2. SALSA: Flash-optimized Software-define Storage
    Nikolas Ioannou, Ioannis Koltsidas, Roman Pletka, Sasa Tomic, and Thomas Weigold
    Flash Memory Summit 2015, Santa Clara
  3. Holistic Flash Management for Next Generation All-Flash Arrays
    Roman Pletka, Nikolas Ioannou, Sasa Tomic, Nikolaos Papandreou, Thomas Parnell, Haris Pozidis, Ioannis Koltsidas, Aaron Fry, and Tim Fisher
    Flash Memory Summit 2015, Santa Clara

2014

  1. Software defined just-in-time caching in an enterprise storage system
    Sangeetha Seshadri, Paul Muench, Lawrence Chiu, Ioannis Koltsidas, Nikolas Ioannou, Robert Haas, Yang Liu, Mei Mei, and Stephen Blinick
    IBM J. Res. Dev., 2014
  2. How Could a Flash Cache Degrade Database Performance Rather Than Improve It? Lessons to be Learnt from Multi-Tiered Storage
    Hyojun Kim, Ioannis Koltsidas, Nikolas Ioannou, Sangeetha Seshadri, Paul Muench, Clement L. Dickey, and Lawrence Chiu
    2nd Workshop on Interactions of NVM/Flash with Operating Systems and Workloads, INFLOW ’14, Broomfield, CO, USA, October 5, 2014
  3. Flash-Conscious Cache Population for Enterprise Database Workloads
    Hyojun Kim, Ioannis Koltsidas, Nikolas Ioannou, Sangeetha Seshadri, Paul Muench, Clement L. Dickey, and Lawrence Chiu
    International Workshop on Accelerating Data Management Systems Using Modern Processor and Storage Architectures - ADMS 2014, Hangzhou, China, September 1, 2014

2012

  1. Complementing user-level coarse-grain parallelism with implicit speculative parallelism
    Nikolas Ioannou
    PhD thesis, University of Edinburgh, UK, 2012.
  2. Mixed speculative multithreaded execution models
    Polychronis Xekalakis, Nikolas Ioannou, and Marcelo Cintra
    ACM Trans. Archit. Code Optim., 2012
  3. Autotuning Skeleton-Driven Optimizations for Transactional Worklist Applications
    Luı́s Fabrı́cio Wanderley Góes, Nikolas Ioannou, Polychronis Xekalakis, Murray Cole, and Marcelo Cintra
    IEEE Trans. Parallel Distributed Syst., 2012

2011

  1. Phase-Based Application-Driven Hierarchical Power Management on the Single-chip Cloud Computer
    Nikolas Ioannou, Michael Kauschke, Matthias Gries, and Marcelo Cintra
    2011 International Conference on Parallel Architectures and Compilation Techniques, PACT 2011, Galveston, TX, USA, October 10-14, 2011
    Best paper candidate
  2. Increasing the energy efficiency of TLS systems using intermediate checkpointing
    Salman Khan, Nikolas Ioannou, Polychronis Xekalakis, and Marcelo Cintra
    18th International Conference on High Performance Computing, HiPC 2011, Bengaluru, India, December 18-21, 2011
  3. Complementing user-level coarse-grain parallelism with implicit speculative parallelism
    Nikolas Ioannou, and Marcelo Cintra
    44rd Annual IEEE/ACM International Symposium on Microarchitecture, MICRO 2011, Porto Alegre, Brazil, December 3-7, 2011

2010

  1. Toward a more accurate understanding of the limits of the TLS execution paradigm
    Nikolas Ioannou, Jeremy Singer, Salman Khan, Polychronis Xekalakis, Paraskevas Yiapanis, Adam Craig Pocock, Gavin Brown, Mikel Luján, Ian Watson, and Marcelo Cintra
    Proceedings of the 2010 IEEE International Symposium on Workload Characterization, IISWC 2010, Atlanta, GA, USA, December 2-4, 2010
  2. Profitability-based power allocation for speculative multithreaded systems
    Polychronis Xekalakis, Nikolas Ioannou, Salman Khan, and Marcelo Cintra
    24th IEEE International Symposium on Parallel and Distributed Processing, IPDPS 2010, Atlanta, Georgia, USA, 19-23 April 2010 - Conference Proceedings

2009

  1. Overlapping computation and communication in SMT clusters with commodity interconnects
    Georgios I. Goumas, Nikos Anastopoulos, Nectarios Koziris, and Nikolas Ioannou
    Proceedings of the 2009 IEEE International Conference on Cluster Computing, August 31 - September 4, 2009, New Orleans, Louisiana, USA
  2. Combining thread level speculation helper threads and runahead execution
    Polychronis Xekalakis, Nikolas Ioannou, and Marcelo Cintra
    Proceedings of the 23rd international conference on Supercomputing, 2009, Yorktown Heights, NY, USA, June 8-12, 2009