Alexandru Iosup

University Research Chair and Full Professor, Vrije Universiteit Amsterdam
Associate Professor, TU Delft
Chief Magic Officer, AtLarge team

Research Focus
Massivizing Computer Systems

Contact

Publications
The AtLarge Vision on the Design of Distributed Systems and Ecosystems.
  • Alexandru Iosup,
  • Laurens Versluis,
  • Animesh Trivedi,
  • Erwin van Eyk,
  • Lucian Toader,
  • Vincent van Beek,
  • Giulia Frascaria,
  • Ahmed Musaafir,
  • Sacheendra Talluri
IEEE International Conference on Distributed Computing Systems (ICDCS 2019)
PDF
Characterization of a Big Data Storage Workload in the Cloud
  • Sacheendra Talluri,
  • Alicja Łuszczak (Databricks B.V., Amsterdam, The Netherlands),
  • Cristina L. Abad (ESPOL, Guayaquil, Ecuador),
  • Alexandru Iosup
ICPE 2019
PDF
Yardstick: A Benchmark for Minecraft-like Services
  • Jerom van der Sar,
  • Jesse Donkervliet,
  • Alexandru Iosup
ICPE 2019
PDF
A Trace-Based Performance Study of Autoscaling Workloads of Workflows in Datacenters
  • Laurens Versluis,
  • Mihai Neacsu,
  • Alexandru Iosup
International Symposium on Cluster, Cloud and Grid Computing 2018
PDF
A Reference Architecture for Datacenter Scheduling
  • Georgios Andreadis,
  • Laurens Versluis,
  • Fabian S. Mastenbroek,
  • Alexandru Iosup
International Conference for High Performance Computing, Networking, Storage and Analysis 2018 (SC18)
PDF
Serverless is More: From PaaS to Present Cloud Computing
  • Erwin van Eyk,
  • Lucian Toader,
  • Sacheendra Talluri,
  • Laurens Versluis,
  • Alexandru Uta,
  • Alexandru Iosup
IEEE Internet Computing, Sep/Oct edition, 2018
PDF
An Analysis of Workflow Formalisms for Workflows with Complex Non-Functional Requirements
  • Laurens Versluis,
  • Erwin van Eyk,
  • Alexandru Iosup
HotCloudPerf 2018
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A SPEC RG Cloud Group's Vision on the Performance Challenges of FaaS Cloud Architectures
  • Erwin van Eyk,
  • Alexandru Iosup,
  • Cristina L. Abad (ESPOL, Ecuador),
  • Johannes Grohmann (U. Wuertzburg, Germany),
  • Simon Eismann (U. Wuertzburg, Germany)
ICPE 2018
PDF
Exploring HPC and Big Data Convergence: A Graph Processing Study on Intel Knights Landing
  • Alexandru Uta,
  • Ana Lucia Varbanescu,
  • Ahmed Musaafir,
  • Chris LeMaire,
  • Alexandru Iosup
Cluster 2018 : IEEE International Conference on Cluster Computing
PDF
Massivizing Computer Systems: a Vision to Understand, Design, and Engineer Computer Ecosystems through and beyond Modern Distributed Systems
  • Alexandru Iosup,
  • Alexandru Uta,
  • Laurens Versluis,
  • Georgios Andreadis,
  • Erwin van Eyk,
  • Tim Hegeman,
  • Sacheendra Talluri,
  • Vincent van Beek,
  • Lucian Toader
International Conference on Distributed Computing Systems 2018
PDF
Elasticity in Graph Analytics? A Benchmarking Framework for Elastic Graph Processing
  • Alexandru Uta,
  • Sietse Au,
  • Alexey Ilyushkin,
  • Alexandru Iosup
Cluster 2018 : IEEE International Conference on Cluster Computing
PDF
An Experimental Performance Evaluation of Autoscalers for Complex Workflows
  • Alexey Ilyushkin,
  • Ahmed Ali El-Din,
  • Nikolas Herbst,
  • Andre Bauer (U. Wuertzburg, Germany),
  • Allesandro Vittorio Papadopoulos,
  • Dick H.J. Epema,
  • Alexandru Iosup
TOMPECS (Best Paper Nominations from ICPE'17, revised and extended versions). Accepted, in print.
PDF
The SPEC Cloud Group's Research Vision on FaaS and Serverless Architectures
  • Erwin van Eyk,
  • Alexandru Iosup,
  • Simon Seif (SAP SE, Germany),
  • Markus Thoemmes (IBM, Germany)
Second International Workshop on Serverless Computing (WoSC@Middleware 2017)
PDF
Granula: Toward Fine-grained Performance Analysis of Large-scale Graph Processing Platforms.
  • Wing Lung Ngai,
  • Tim Hegeman,
  • Stijn Heldens,
  • Alexandru Iosup
GRADES@SIGMOD/PODS 2017: 8:1-8:6
PDF
An Experimental Performance Evaluation of Autoscaling Policies for Complex Workflows
  • Alexey Ilyushkin,
  • Ahmed Ali El-Din,
  • Nikolas Herbst,
  • Allesandro Vittorio Papadopoulos,
  • Bogdan Ghit,
  • Dick H.J. Epema,
  • Alexandru Iosup
ICPE 2017: 75--86 (Nominated for Best Paper Award)
PDF
Modeling, analysis, and experimental comparison of streaming graph-partitioning policies.
  • Yong Guo,
  • Hassan Chafi,
  • Sungpack Hong,
  • Alexandru Iosup,
  • Dick H.J. Epema
J. Parallel Distrib. Comput. 108: 106-121 (2017)
PDF
The OpenDC Vision: Towards Collaborative Datacenter Simulation and Exploration for Everybody.
  • Alexandru Iosup,
  • Georgios Andreadis,
  • Vincent van Beek,
  • Matthijs Bijman,
  • Erwin van Eyk,
  • Mihai Neacsu,
  • Leon Overweel,
  • Sacheendra Talluri,
  • Laurens Versluis,
  • Maaike Visser
ISPDC 2017 (invited paper)
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LDBC Graphalytics: A Benchmark for Large-Scale Graph Analysis on Parallel and Distributed Platforms
  • Alexandru Iosup,
  • Tim Hegeman,
  • Wing Lung Ngai,
  • Stijn Heldens,
  • Arnau Prat-Perez (UPC, Barcelona, Spain),
  • Thomas Manhardt (Oracle Labs, CA, USA),
  • Hassan Chafi,
  • Mihai Capota,
  • Narayanan Sundaram (Intel Labs, OR, USA),
  • Michael J. Anderson (Intel Labs, OR, USA),
  • Ilie Gabriel Tanase (IBM TJ Watson, NY, USA),
  • Yinglong Xia (Huawei Research America, CA, USA),
  • Lifeng Nai (Georgia Tech, GA, USA),
  • Peter A. Boncz
PVLDB 9(13): 1317-1328 (2016)
PDF
When Game Becomes Life: The Creators and Spectators of Online Game Replays and Live Streaming.
  • Adele Lu Jia,
  • Siqi Shen,
  • Dick H.J. Epema,
  • Alexandru Iosup
TOMCCAP 12(4): 47:1-47:24 (2016)
PDF
Design and Experimental Evaluation of Distributed Heterogeneous Graph-Processing Systems
  • Yong Guo,
  • Ana Lucia Varbanescu,
  • Dick H.J. Epema,
  • Alexandru Iosup
CCGrid 2016: 203-212
PDF
Towards the Next Generation of Large-Scale Network Archives.
  • Stijn Heldens,
  • Ana Lucia Varbanescu,
  • Wing Lung Ngai,
  • Tim Hegeman,
  • Alexandru Iosup
Euro-Par Workshops 2016: 571-579
PDF
An Empirical Performance Evaluation of GPU-Enabled Graph-Processing Systems.
  • Yong Guo,
  • Ana Lucia Varbanescu,
  • Alexandru Iosup,
  • Dick H.J. Epema
CCGRID 2015: 423-432
PDF
An Availability-on-Demand Mechanism for Datacenters.
  • Siqi Shen,
  • Alexandru Iosup,
  • Assaf Israel (Technion, Israel),
  • Walfredo Cirne (Google Inc., Mountain View, CA, USA),
  • Danny Raz (Technion, Israel),
  • Dick H.J. Epema
CCGRID 2015: 495-504
PDF
Socializing by Gaming: Revealing Social Relationships in Multiplayer Online Games
  • Adele Lu Jia,
  • Siqi Shen,
  • Ruud van de Bovenkamp (TU Delft),
  • Alexandru Iosup,
  • Fernando A. Kuipers,
  • Dick H.J. Epema
TKDD 10(2): 11:1-11:29 (2015)
PDF
V for Vicissitude: The Challenge of Scaling Complex Big Data Workflows
  • Bogdan Ghit,
  • Mihai Capota,
  • Tim Hegeman,
  • Jan Hidders (TU Delft),
  • Dick H.J. Epema,
  • Alexandru Iosup
CCGRID 2014: 927-932
PDF
Toxicity detection in multiplayer online games.
  • Marcus Maertens,
  • Siqi Shen,
  • Alexandru Iosup,
  • Fernando A. Kuipers
NETGAMES 2015: 1-6 (Best Paper Award)
PDF
Area of Simulation: Mechanism and Architecture for Multi-Avatar Virtual Environments.
  • Siqi Shen,
  • Shun-Yun Hu,
  • Alexandru Iosup,
  • Dick H.J. Epema
TOMCCAP 12(1): 8:1-8:24 (2015)
PDF
Statistical Characterization of Business-Critical Workloads Hosted in Cloud Datacenters.
  • Siqi Shen,
  • Vincent van Beek,
  • Alexandru Iosup
CCGRID 2015: 465-474
PDF
Mnemos: Self-Expressive Management of Business-Critical Workloads in Virtualized Datacenters
  • Vincent van Beek,
  • Jesse Donkervliet,
  • Tim Hegeman,
  • Stefan Hugtenburg (TU Delft),
  • Alexandru Iosup
IEEE Computer 48(7): 46-54 (2015)
PDF
Massivizing online games using cloud computing: A vision.
  • Alexandru Iosup,
  • Siqi Shen,
  • Yong Guo,
  • Stefan Hugtenburg,
  • Jesse Donkervliet,
  • Radu Prodan
ICME Workshops 2014: 1-4
PDF
Modeling Avatar Mobility of Networked Virtual Environments.
  • Siqi Shen,
  • Alexandru Iosup
MMVE@MMSys 2014: 2:1-2:6
PDF
Characterization of Human Mobility in Networked Virtual Environments.
  • Siqi Shen,
  • Niels Brouwers,
  • Alexandru Iosup,
  • Dick H.J. Epema
NOSSDAV 2014: 13
PDF
Towards Benchmarking IaaS and PaaS Clouds for Graph Analytics.
  • Alexandru Iosup,
  • Mihai Capota,
  • Tim Hegeman,
  • Yong Guo,
  • Wing Lung Ngai,
  • Ana Lucia Varbanescu,
  • Merijn Verstraaten
WBDB 2014: 109-131
PDF
Analyzing Implicit Social Networks in Multiplayer Online Games.
  • Alexandru Iosup,
  • Ruud van de Bovenkamp,
  • Siqi Shen,
  • Adele Lu Jia,
  • Fernando A. Kuipers
IEEE Internet Computing 18(3): 36-44 (2014)
PDF
An experience report on using gamification in technical higher education.
  • Alexandru Iosup,
  • Dick H.J. Epema
SIGCSE 2014: 27-32
PDF
How Well Do Graph-Processing Platforms Perform? An Empirical Performance Evaluation and Analysis.
  • Yong Guo,
  • Marcin Biczak,
  • Ana Lucia Varbanescu,
  • Alexandru Iosup,
  • Claudio Martella,
  • Theodore (Ted) Willke
IPDPS 2014: 395-404
PDF
Benchmarking graph-processing platforms: a vision.
  • Yong Guo,
  • Ana Lucia Varbanescu,
  • Alexandru Iosup,
  • Claudio Martella,
  • Theodore (Ted) Willke
ICPE 2014: 289-292
PDF
IaaS Cloud Benchmarking: Approaches, Challenges, and Experience.
  • Alexandru Iosup,
  • Radu Prodan,
  • Dick H.J. Epema
Cloud Computing for Data-Intensive Applications 2014: 83-104 (book chapter)
PDF
A Periodic Portfolio Scheduler for Scientific Computing in the Data Center.
  • Kefeng Deng,
  • Ruben Verboon,
  • Kaijun Ren,
  • Alexandru Iosup
JSSPP 2013: 156-176
PDF
The Failure Trace Archive: Enabling the comparison of failure measurements and models of distributed systems.
  • Bahman Javadi,
  • Derrick Kondo,
  • Alexandru Iosup,
  • Dick H.J. Epema
J. Parallel Distrib. Comput. 73(8): 1208-1223 (2013)
PDF
Massivizing Multi-player Online Games on Clouds.
  • Siqi Shen,
  • Alexandru Iosup,
  • Dick H.J. Epema
CCGRID 2013: 152-155
PDF
Procedural content generation for games: A survey.
  • Mark Hendrikx,
  • Sebastiaan Meijer,
  • Joeri Van Der Velden,
  • Alexandru Iosup
TOMCCAP 9(1): 1:1-1:22 (2013)
PDF
Exploring portfolio scheduling for long-term execution of scientific workloads in IaaS clouds.
  • Kefeng Deng,
  • Junqiang Song,
  • Kaijun Ren,
  • Alexandru Iosup
SC 2013: 55:1-55:12
PDF
Scheduling Jobs in the Cloud Using On-Demand and Reserved Instances.
  • Siqi Shen,
  • Kefeng Deng,
  • Alexandru Iosup,
  • Dick H.J. Epema
Euro-Par 2013: 242-254
PDF
Benchmarking in the Cloud: What It Should, Can, and Cannot Be.
  • Enno Folkerts,
  • Alexander Alexandrov,
  • Kai Sachs,
  • Alexandru Iosup,
  • Volker Markl,
  • Cafer Tosun
TPCTC 2012: 173-188
PDF
The Game Trace Archive.
  • Yong Guo,
  • Alexandru Iosup
NetGames 2012: 1-6
PDF
An Analysis of Provisioning and Allocation Policies for Infrastructure-as-a-Service Clouds.
  • David Villegas,
  • Athanasios Antoniou,
  • Seyed Masoud Sadjadi,
  • Alexandru Iosup
CCGRID 2012: 612-619
PDF
An analysis of online match-based games.
  • Yong Guo,
  • Siqi Shen,
  • Otto Visser,
  • Alexandru Iosup
HAVE 2012: 134-139 (Workshops)
PDF
ExPERT: Pareto-Efficient Task Replication on Grids and a Cloud.
  • Orna Agmon Ben-Yehuda,
  • Assaf Schuster,
  • Artyom Sharov,
  • Mark Silberstein,
  • Alexandru Iosup
IPDPS 2012: 167-178
PDF
Identifying, analyzing, and modeling flashcrowds in BitTorrent.
  • Boxun Zhang,
  • Alexandru Iosup,
  • Johan A. Pouwelse,
  • Dick H.J. Epema
Peer-to-Peer Computing 2011: 240-249
PDF
Performance Analysis of Cloud Computing Services for Many-Tasks Scientific Computing
  • Alexandru Iosup,
  • Simon Ostermann (U. Innsbruck),
  • Nezih Yigitbasi,
  • Radu Prodan,
  • Thomas Fahringer,
  • Dick H.J. Epema
IEEE Trans. Parallel Distrib. Syst. 22(6): 931-945 (2011)
PDF
A new business model for massively multiplayer online games.
  • Vlad Nae,
  • Alexandru Iosup,
  • Radu Prodan,
  • Thomas Fahringer
ICPE 2011: 271-282
PDF
On the Performance Variability of Production Cloud Services.
  • Alexandru Iosup,
  • Nezih Yigitbasi,
  • Dick H.J. Epema
CCGRID 2011: 104-113
PDF
Dynamic Resource Provisioning in Massively Multiplayer Online Games.
  • Vlad Nae,
  • Alexandru Iosup,
  • Radu Prodan
IEEE Trans. Parallel Distrib. Syst. 22(3): 380-395 (2011)
PDF
Grid Computing Workloads.
  • Alexandru Iosup,
  • Dick H.J. Epema
IEEE Internet Computing 15(2): 19-26 (2011)
PDF
Analysis and modeling of time-correlated failures in large-scale distributed systems.
  • Nezih Yigitbasi,
  • Matthieu Gallet,
  • Derrick Kondo,
  • Alexandru Iosup,
  • Dick H.J. Epema
GRID 2010: 65-72
PDF
Sampling Bias in BitTorrent Measurements.
  • Boxun Zhang,
  • Alexandru Iosup,
  • Johan A. Pouwelse,
  • Dick H.J. Epema,
  • Henk J. Sips
Euro-Par 2010: 484-496
PDF
The Failure Trace Archive: Enabling Comparative Analysis of Failures in Diverse Distributed Systems.
  • Derrick Kondo,
  • Bahman Javadi,
  • Alexandru Iosup,
  • Dick H.J. Epema
CCGRID 2010: 398-407 (Best Paper Award)
PDF
A Model for Space-Correlated Failures in Large-Scale Distributed Systems.
  • Matthieu Gallet,
  • Nezih Yigitbasi,
  • Bahman Javadi,
  • Derrick Kondo,
  • Alexandru Iosup,
  • Dick H.J. Epema
Euro-Par 2010: 88-100
PDF
BTWorld: towards observing the global BitTorrent file-sharing network.
  • Maciej Wojciechowski,
  • Mihai Capota,
  • Johan A. Pouwelse,
  • Alexandru Iosup
HPDC 2010: 581-588
PDF
The performance of bags-of-tasks in large-scale distributed systems.
  • Omer Ozan Sonmez,
  • Nezih Yigitbasi,
  • Saeid Abrishami,
  • Alexandru Iosup,
  • Dick H.J. Epema
HPDC 2010: 49-60
PDF
Trace-based evaluation of job runtime and queue wait time predictions in grids.
  • Omer Ozan Sonmez,
  • Nezih Yigitbasi,
  • Alexandru Iosup,
  • Dick H.J. Epema
HPDC 2009: 111-120
PDF
C-Meter: A Framework for Performance Analysis of Computing Clouds.
  • Nezih Yigitbasi,
  • Alexandru Iosup,
  • Dick H.J. Epema,
  • Simon Ostermann
CCGRID 2009: 472-477
PDF
Inter-operating grids through Delegated MatchMaking.
  • Alexandru Iosup,
  • Todd Tannenbaum,
  • Matthew Farrellee,
  • Dick H.J. Epema,
  • Miron Livny
Scientific Programming 16(2-3): 233-253 (2008) (Special Issue with Nominated and Best Paper Awards at SC|07
PDF
On the characteristics of grid workflows.
  • Simon Ostermann,
  • Radu Prodan,
  • Thomas Fahringer,
  • Alexandru Iosup,
  • Dick H.J. Epema
CoreGRID Symposium at Euro-Par 2008
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The performance of bags-of-tasks in large-scale distributed systems.
  • Alexandru Iosup,
  • Omer Ozan Sonmez,
  • Shanny Anoep,
  • Dick H.J. Epema
HPDC 2008: 97-108
PDF
Efficient management of data center resources for massively multiplayer online games.
  • Vlad Nae,
  • Alexandru Iosup,
  • Stefan Podlipnig,
  • Radu Prodan,
  • Dick H.J. Epema,
  • Thomas Fahringer
SC 2008: 10
PDF
TRIBLER: a social-based peer-to-peer system.
  • Johan A. Pouwelse,
  • Pawel Garbacki,
  • Jun Wang,
  • Arno Bakker,
  • Jie Yang,
  • Alexandru Iosup,
  • Dick H.J. Epema,
  • Marcel J. T. Reinders,
  • Maarten van Steen,
  • Henk J. Sips
Concurrency and Computation: Practice and Experience 20(2): 127-138 (2008)
PDF
The Grid Workloads Archive.
  • Alexandru Iosup,
  • Hui Li,
  • Mathieu Jan,
  • Shanny Anoep,
  • Catalin Dumitrescu,
  • Lex Wolters,
  • Dick H.J. Epema
Future Generation Comp. Syst. 24(7): 672-686 (2008)
PDF
A performance study of grid workflow engines.
  • Corina Stratan,
  • Alexandru Iosup,
  • Dick H.J. Epema
GRID 2008: 25-32
PDF
Inter-operating grids through delegated matchmaking.
  • Alexandru Iosup,
  • Dick H.J. Epema,
  • Todd Tannenbaum,
  • Matthew Farrellee,
  • Miron Livny
SC 2007: 13 (Nominated for Best Paper Award and Best Student Paper Award)
PDF
On the dynamic resource availability in grids.
  • Alexandru Iosup,
  • Mathieu Jan,
  • Omer Ozan Sonmez,
  • Dick H.J. Epema
GRID 2007: 26-33
PDF
Build-and-Test Workloads for Grid Middleware: Problem, Analysis, and Applications.
  • Alexandru Iosup,
  • Dick H.J. Epema
CCGRID 2007: 205-213
PDF
The Characteristics and Performance of Groups of Jobs in Grids.
  • Alexandru Iosup,
  • Mathieu Jan,
  • Omer Ozan Sonmez,
  • Dick H.J. Epema
Euro-Par 2007: 382-393
PDF
How are Real Grids Used? The Analysis of Four Grid Traces and Its Implications.
  • Alexandru Iosup,
  • Catalin Dumitrescu,
  • Dick H.J. Epema,
  • Hui Li,
  • Lex Wolters
GRID 2006: 262-269
PDF
2Fast : Collaborative Downloads in P2P Networks.
  • Pawel Garbacki,
  • Alexandru Iosup,
  • Dick H.J. Epema,
  • Maarten van Steen
Peer-to-Peer Computing 2006: 23-30 (Best Paper Award)
PDF
Correlating Topology and Path Characteristics of Overlay Networks and the Internet.
  • Alexandru Iosup,
  • Pawel Garbacki,
  • Johan A. Pouwelse,
  • Dick H.J. Epema
CCGRID 2006: 10
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On Grid Performance Evaluation Using Synthetic Workloads.
  • Alexandru Iosup,
  • Dick H.J. Epema,
  • Carsten Franke,
  • Alexander Papaspyrou,
  • Lars Schley,
  • Baiyi Song,
  • Ramin Yahyapour
JSSPP 2006: 232-255
PDF
GRENCHMARK: A Framework for Analyzing, Testing, and Comparing Grids.
  • Alexandru Iosup,
  • Dick H.J. Epema
CCGRID 2006: 313-320
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Provisioning and Scheduling Resources for World-Wide Data-Sharing Services.
  • Alexandru Iosup,
  • Pawel Garbacki,
  • Dick H.J. Epema
e-Science 2006: 84
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