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Computer Sciences

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OVERVIEW

The Computer Sciences department focuses its research activities in a set of areas covering lower levels of system software and hardware for future supercomputer systems as well as optimization of kernels and applications for these systems.

COMPUTER SCIENCES DEPARTMENT DIRECTOR

arrowLabarta, Jesús

COMPUTER SCIENCES DEPARTMENT ASSOCIATE DIRECTOR

arrowAyguadé, Eduard

OBJECTIVES

The main objective of the department is to make advance in the hardware and software technologies available to build and efficiently use supercomputing infrastructures, bridging the gap between computer architecture and application requirements. The department is proposing novel architectures for processor, memory hierarchy and their interconnection, programming models and their efficient implementation, tools for performance analysis and prediction, resource management at different levels in the system (processor, memory, storage) and for different execution environments, including Grid and e-Business platforms, as well as application optimization.

A second objective of the Department is to do research in collaboration with computing system providers. In this direction, the BSC-CNS has signed agreements with IBM Research, Microsoft Research and Sun Microsystems, and defined specific projects in areas related with computer architecture, tools for performance analysis, programming models, autonomic systems and application optimization using architecture-specific capabilities.

Finally, the Computer Sciences department wants to keep a very close interaction between the different departments of the BSC-CNS. The department will bring the technologies developed to the application departments and groups in the BSC-CNS and will favor its efficient use. This synergy, along with the available experience in the optimization of applications (both numeric and non-numeric) will reduce significantly the huge simulation times normally required. In addition, new applications for future supercomputers with many more processors will be investigated. On the other hand, the application groups at BSC-CNS will show their needs that will drive the research at hardware level for the future supercomputers (processors, memory, and their interconnection following performance, cost, and power consumption criteria), at base-software level (tools, compilers, and programming models that will ease the programming and optimization of applications), as well as the basic-algorithm level that is the building block for applications.

RESEARCH LINES

The following list enumerates the major research areas that define the research teams in the Computational Sciences department:

The Computer Architecture and Operating System (CAOS) group focuses on real-time embedded systems and high-performance computing at both architecture and operating system level, analyzing the interaction between hardware and software. The group's research topics include design for low power and low temperature, high-performance power-efficient multicore/multithreaded processors, performance- and power-aware OS schedulers, load balancing for HPC applications, predictability and time analyzability of real-time systems.

  • COMPUTER ARCHITECTURE
    Àlex Ramírez

    The team explores different design alternatives of processor and system architectures for future generation supercomputer systems. At the lowest level the exploitation of different levels of parallelism in the processor (instruction level parallelism, data level parallelism, or thread level parallelism) needs to be investigated taking into account performance/cost trade-offs. At the multicore and multiprocessor level issues related with the heterogeneity of the cores, memory organization and communication protocols are considered.

  • PERFORMANCE TOOLS
    Judit Giménez

    The team is working on the design of tools to instrument, analyse and predict the behaviour of parallel applications on parallel systems. Flexibility, simplicity and the appropriate combination of qualitative and quantitative information are some of the issues considered in the design of these tools. Scalability and ability of handling the high volumes of performance data are also two issues that need to be considered to handle long running applications that use hundred/thousand processors. The team is also working in the definition of methodologies and procedures that would simplify and facilitate the process of analysis and optimization.

  • PROGRAMMING MODELS
    Xavier Martorell

    The team is doing research on the proposal of programming models and their efficient implementation for future architectures, including multi-core chips, shared-memory SMPs and distributed-memory clusters and constellations. The implementation for these programming models requires the development of compiler prototypes as well as intelligent adaptive runtime systems. The team explores the usability of these programming models in different application scenarios, proposing extensions to the standards to accommodate the requirements of novel applications for supercomputer systems.

  • GRID COMPUTING AND CLUSTERS
    Rosa Mª Badia

    The team focuses in the proposal of programming and execution models and resource management infrastructures for computational Grids. The team explores solutions in order to simplify application development, enable dynamic exploitation of parallelism at runtime and perform combined scheduling decisions at different levels.


  • AUTONOMIC SYSTEMS AND E-BUSINESS PLATFORMS
    Jordi Torres

    The team performs high-level research in eBusiness applications and platforms executing on high-productivity multiprocessor architectures as well as distributed environments and new architectural proposals, with the objective of becoming a research group of excellence in Autonomic Computing.

  • STORAGE SYSTEMS
    Toni Cortés

    The team focuses on finding appropriate solutions to the scalability of parallel file systems in large installations (in which very large volumes od data need to be generated and accessed) and file systems for the grid that solve the problems currently found (data location, replication and striping) and that will make these environments more efficient.


PUBLICATIONS AND COMMUNICATIONS


Publications

Journals

J. Ejarque, M. de Palol, I. Goiri, F. Julià, J. Guitart, R. Badia, and J. Torres. Exploiting Semantics and Virtualization for SLA-driven Resource Allocation in Service Providers. Concurrency and Computation: Practice and Experience, Vol. 22 (5), pp. 541-572, ISSN: 1532-0634 , April 2010.

J. Guitart, J. Torres, and E. Ayguadé. A Survey on Performance Management for Internet Applications. Concurrency and Computation: Practice and Experience, Vol. 22 (1), pp. 68-106, ISSN: 1532-0634 , January 2010.

Felix Hupfeld, Toni Cortes, Björn Kolbeck, Jan Stender, Erich Focht, Matthias Hess, Jesus Malo, Jonathan Marti, Eugenio Cesario . The XtreemFS architecture—a case for object-based file systems in Grids. CONCURRENCY AND COMPUTATION: PRACTICE AND EXPERIENCE, Vol 20, No. 17, December 2008.

M. Macías, O. Rana, G. Smith, J. Guitart, and J. Torres. Maximizing Revenue in Grid Markets using an Economically Enhanced Resource Manager. Concurrency and Computation: Practice and Experience, ISSN: 1532-0634, September 2008.

Rosa M. Badia, Dennis Gannon, Craig Lee. Special section: Selected papers from the 7th IEEE/ACM international conference on grid computing (Grid2006). Future Generation Computer Systems, , May 2008.
Vol: 24, Issue: 5, pags: 402-403

J. Guitart, D. Carrera, V. Beltran, J. Torres, and E. Ayguadé. Dynamic CPU Provisioning for Self-Managed Secure Web Applications in SMP Hosting Platforms. Computer Networks, Vol. 52 (7), pp. 1390-1409, ISSN: 1389-1286, May 2008.

Alberto Sánchez, María S. Pérez, Pierre Gueant, Jesús Montes, Pilar Herrero and Toni Cortes. Improving GridFTP transfers by means of a multiagent parallel file system. Multiagent and Grid Systems - An International Journal, Vol 3, No. 4, , December 2007.

J. Guitart, D. Carrera, V. Beltran, J. Torres, and E. Ayguadé. Designing an Overload Control Strategy for Secure e-Commerce Applications. Computer Networks, Vol. 51 (15), pp. 4492-4510, ISSN: 1389-1286, October 2007.

F. Guim, I. Rodero, J. Corbalan, J. Labarta, A. Oleksiak, J. Nabrzyski. Uniform Job Monitoring in the HPC-Europa Project: Data Model, API and Services. International Journal of Web and Grid Services, Vol 3, Nº 3, , August 2007.

Josep M. Perez, Pieter Bellens, Rosa M. Badia and Jesus Labarta. CellSs: Making it easier to Program the Cell Broadband Engine processor . IBM Journal of R&D, Volume 51, Number 5, , August 2007.

F. Guim, I. Rodero, J. Corbalán, J. Labarta. Portal de Acceso a Recursos HPC en Entornos Grid. Boletín RedIRIS 80,
, April 2007.

Raül Sirvent, Rosa M. Badia, Pieter Bellens, Vasilis Dialinos, Jesús Labarta, Josep M. Pérez. Demostración de uso de GRID superscalar. Boletín RedIRIS, no. 80, , April 2007.

Goyeneche, Ariel and Guim, F. and Rodero, I. and Terstyanszky, Gabor and Corbalan, J. Extracting performance hints for Grid Users using data mining techniques: a case study in the NGS. Mediterranean Journal of Computers and Networks SPECIAL ISSUE on Data Mining Applications on Supercomputing and Grid Environments Volume 3, No. 2,p 52-61, , April 2007.

S. Reyes, C. Muñoz-Caro, A. Niño, R. M. Badia and J. M. Cela. Performance of computation-intensive, parameter sweep applications on Internet-based Grids of computers. The mapping of molecular potential energy hypersurfaces. Concurrency and Computation: Practice and Experience, Vol. 19, No. 4 , March 2007.

J. Piernas, T. Cortes, J. M. García. The Design of New Journaling File Systems: The DualFS Case. IEEE TRANSACTION ON COMPUTERS, Vol. 52, num. 2, February 2007.

Raul Sirvent, Josep M. Perez, Rosa M. Badia and Jesus Labarta. Automatic Grid workflow based on imperative programming languages . Concurrency and Computation: Practice and experience, Vol.18. Issue 10. Pages: 1169-1186. , August 2006.

Book chapters

M. Macías, G. Smith, O. Rana, J. Guitart, and J. Torres. Enforcing Service Level Agreements using an Economically Enhanced Resource Manager. Economic Models and Algorithms for Distributed Systems, Autonomic Systems Series, Part II: Service Level Agreements, Chapter 6, pp. 109-127, Birkhäuser-Springer, ISBN: 978-3-7643-8896-6, December 2009.

T. Püschel, N. Borissov, D. Neumann, M. Macías, J. Guitart, and J. Torres. Extended Resource Management Using Client Classification and Economic Enhancements. Economic Models and Algorithms for Distributed Systems, Autonomic Systems Series, Part II: Service Level Agreements, Chapter 7, pp. 129-141, Birkhäuser-Springer, ISBN: 978-3-7643-8896-6, December 2009.

J. Guitart, M. Macías, O. Rana, P. Wieder, R. Yahyapour, W. Ziegler. SLA-based Resource Management and Allocation. Market Oriented Grid and Utility Computing, Part III: Policies and Agreements, Chapter 12, pp. 261-284, John Wiley & Sons, ISBN: 978-0-470-28768-2, November 2009.

M. Ejdys, U. Herman-Izycka, N. Lal, T. Kielmann, E. Tejedor and R.M. Badia. Integrating Application and System Components with the Grid Component Model. From Grids to Service and Pervasive Computing, , August 2008.

Rosa M. Badia, Gargi Dasgupta, Onyeka Ezenwoye, Liana Fong, Howard Ho, Sawsan Khuri, Yanbin Liu, Steve Luis, Anthony Praino, Jean-Pierre Prost, Ahmed Radwan, Seyed Masoud Sadjadi, Shivkumar Shivaji, Balaji Viswanathan, Patrick Welsh, and Akmal Younis. Innovative Grid Technologies Applied to Bioinformatics and Hurricane Mitigation. High Performance Computing and Grids in Action, , March 2008.
IOS Press

E. Tejedor, R. Badia, T. Kielmann and V. Getov. A Component-Based Integrated Toolkit. Making Grids Work, CoreGRID series, Vol 7, pp 139-152. M. Danelutto, P. Fragopoulou and V. Getov, Eds. Springer., January 2008.

I.Rodero, F.Guim, J.Corbalan, J.Labarta, A.Oleksiak, K.Kurowski, J.Nabrzyski. Integration of the eNANOS execution framework with GRMS for GRID purposes. Achievements in European Research on Grid Systems, Pages 25-39 , January 2008.

Rosa Badia, Raül Sirvent, Marian Bubak, Wlodzimierz Funika and Piotr Machner. Performance monitoring of GRID superscalar with OCM-G/G-PM: Integration Issues. Achievements in European Research on Grid Systems, Pages 193-205 , January 2008.

Elżbieta Krępska, Thilo Kielmann, Raül Sirvent and Rosa Badia. A Service for Reliable Execution of Grid Applications. Achievements in European Research on Grid Systems, Pages 179-192 , January 2008.

Raül Sirvent, Rosa Badia, Natalia Currle-Linde, Michael Resch. GRID superscalar and GriCoL: Integrating Different Programming Approaches. Achievements in European Research on Grid Systems, Pages 139-150 , January 2008.

Ani Anciaux-Sedrakian, Rosa M. Badia, Raul Sirvent, Josep M. Perez, Thilo Kielmann, Andre Merzky. GRID superscalar and Job Mapping on the Reliable Grid Resources. Making Grids Work, CoreGRID series, , January 2008.

Rosa M. Badia, Raul Sirvent, Marian Bubak, Wlodzimierz Funika, Piotr Machner. Performance Monitoring of Grid Superscalar with OCM-G/G-PM: Tuning and Improvements. Making Grids Work, CoreGRID series, , January 2008.

Raül Sirvent, Josep M. Pérez, Rosa M. Badia, Róbert Lovas, Gergely Sipos and Péter Kacsuk. GRID superscalar enabled P-GRADE portal. Integrated Research in GRID Computing, pages 241-254 , November 2007.

K. Kurowski, A. Oleksiak, J. Nabrzyski, A. Kwiecien, M. Wojtkiewicz, M. Dyvzkowski, F. Guim, J. Corbalan, J. Labarta. Multi-criteria Grid Resource Management using Performance Prediction Techniques. Integrated Research in GRID Computing, Pages 215-225 , November 2007.

Raül Sirvent, Josep M. Pérez, Rosa M. Badia, Jesus Labarta. Programación en el Grid: una aproximación basada en lenguajes imperativos. Computación Grid: del Middleware a las Aplicaciones, pp. 33-52, , June 2007.

Rosa M. Badia, Raul Sirvent, Jesus Labarta, Josep M.P erez. Programming the GRID: An Imperative Language Based Approach . book chapter in Engineering the Grid, Section 4, Chapter 12 , January 2006.

T. Cortes, J. Labarta, S. Girona. Design Issues of a Cooperative Cache with no Coherence Problems. High Performance mass Storage and Parallel I/O: Technologies and Applications, Editors: Hai Jin, Toni Cortes, and Rajkumar Buyya. Publisher: IEEE Press and Wiley. ISBN: 0-471-20809-4, January 2002.

T. Cortes. Software RAID and Parallel Filesystems. High Performance Cluster Computing: Architectures and Systems, Editor: Rajkumar Buyya. Publisher: Prentice Hall. ISBN: 0-13-013784-7, January 1999.

International Conferences

Ramón Nou, Jacobo Girarlt, Julita Corbalan, Enric Tejedor, J. Oriol Fitó, Josep M. Pérez, Toni Cortes. XtreemOS Application Execution Management: A scalable approach. 11th ACM/IEEE International Conference on Grid Computing (Grid 2010), Brussels, Belgium , October 2010.

I. Goiri, J.O. Fitó, F. Julià, R. Nou, J.L. Berral, J. Guitart, and J. Torres. Multifaceted Resource Management for Dealing with Heterogeneous Workloads in Virtualized Data Centers. 11th International Conference on Grid Computing (Grid'10), Brussels, Belgium, , October 2010.

Pilar Gonález-Férez, Juan Piernas, and Toni Cortes. Simultaneous Evaluation of Multiple I/O Strategies. 22nd International Symposium on Computer Architecture and High Performance Computing, Petrópolis, Brazil , October 2010.

I. Goiri, F. Julià, R. Nou, J.L. Berral, J. Guitart, and J. Torres. Energy-aware Scheduling in Virtualized Datacenters. 12th IEEE International Conference on Cluster Computing (Cluster'10), Heraklion, Crete, Greece, , September 2010.

G. Reig, J. Alonso, and J. Guitart. Prediction of Job Resource Requirements for Deadline Schedulers to Manage High-Level SLAs on the Cloud. 9th IEEE International Symposium on Network Computing and Applications (NCA'10), Cambridge, Massachusetts, USA, pp. 162-167 (Short Paper), ISBN: 978-0-7695-4118-1, July 2010.

I. Goiri, J. Guitart, and J. Torres. Characterizing Cloud Federation for Enhancing Providers' Profit. 3rd IEEE International Conference on Cloud Computing (CLOUD'10), Miami, Florida, USA, pp. 123-130, ISBN: 978-0-7695-4130-3, July 2010.

Alvaro Martínez, Santiago Prieto, Noé Gallego, Ramon Nou, Jacobo Giralt, Toni Cortes. XtreemOS-MD: Grid computing from mobile devices. Mobilware 2010, Chicago, USA, June 2010.

Josep M Perez, Rosa M. Badia and Jesus Labarta. Handling task dependencies under strided and aliased references. Proceedings of the 24th ACM International Conference on Supercomputing, , June 2010.

Jorge Ejarque, Enric Tejedor, Daniele Lezzi, Raül Sirvent, Rosa M. Badia. Supporting Parallel Tasks with GRID superscalar. 4th Iberian Grid Infraestructure Conference, , May 2010.

I. Goiri, F. Julià, J. Guitart, and J. Torres. Checkpoint-based Fault-tolerant Infrastructure for Virtualized Service Providers. 12th IEEE/IFIP Network Operations and Management Symposium (NOMS'10), Osaka, Japan, pp. 455-462, ISBN: 978-1-4244-5367-2, ISSN: 1542-1201, April 2010.

M. Macías and J. Guitart. Using Resource-level Information into Nonadditive Negotiation Models for Cloud Market Environments. 12th IEEE/IFIP Network Operations and Management Symposium (NOMS'10), Osaka, Japan, pp. 325-332, ISBN: 978-1-4244-5367-2, ISSN: 1542-1201, April 2010.

J.L. Berral, I. Goiri, R. Nou, F. Julià, J. Guitart, R. Gavaldà, and J. Torres. Towards Energy-aware Scheduling in Data Centers using Machine Learning. 1st International Conference on Energy-Efficient Computing and Networking (e-Energy'10), University of Passau, Germany, pp. 215-224, ISBN: 978-1-4503-0042-1, April 2010.

Ernest Artiaga and Toni Cortes. Using File System Virtualization to Avoid Metadata Bottlenecks. Design, Automation and Test in Europe (DATE 2010), Dresden, Germany, March 2010.

J.O. Fitó, I. Goiri, and J. Guitart. SLA-driven Elastic Cloud Hosting Provider. 18th Euromicro Conference on Parallel, Distributed and Network-based Processing (PDP'10), Pisa, Italy, pp. 111-118, ISBN: 978-0-7695-3939-3, ISSN: 1066-6192, February 2010.

J. Gonzalez, J. Gimenez and J. Labarta. Automatic evaluation of the computation structure of parallel applications. International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT’09), , December 2009.

I. Goiri, F. Julia, J. Ejarque, M. de Palol, R. Badia, J. Guitart, and J. Torres. Introducing Virtual Execution Environments for Application Lifecycle Management and SLA-Driven Resource Distribution within Service Providers. 8th IEEE International Symposium on Network Computing and Applications (NCA'09), Cambridge, Massachusetts, USA, pp. 211-218, ISBN: 978-0-7695-3698-9 , July 2009.

J. Gonzalez, J. Gimenez and J. Labarta. Automatic Detection of Parallel Applications Computation Phases. IEEE International Symposium on Parallel & Distributed Processing (IPDPS’09), , May 2009.

I. Goiri, F. Julià, and J. Guitart. Efficient Data Management Support for Virtualized Service Providers. 17th Euromicro Conference on Parallel, Distributed and Network-based Processing (PDP'09), Weimar, Germany, pp. 409-413 (Short Paper), ISBN: 978-0-7695-3544-9, ISSN: 1066-6192, February 2009.

J. Ejarque, M. de Palol, I. Goiri, F. Julià, J. Guitart, R. Badia, and J. Torres. SLA-Driven Semantically-Enhanced Dynamic Resource Allocator for Virtualized Service Providers. 4th IEEE International Conference on e-Science (e-Science 2008), Indianapolis, Indiana, USA, pp. 8-15, ISBN: 978-0-7695-3535-7, December 2008.

José Luis González and Toni Cortes. Distributing Orthogonal Redundancy on Adaptive Disk Arrays. International Conference on Grid computing, high-performAnce and Distributed Applications (GADA'08), Monterrey, Mexico, November 2008.

Marc Casas, Rosa M. Badia, Jesus Labarta. Prediction of Behavior of MPI Applications. IEEE Cluster 2008,
, September 2008.

Josep M. Perez, Rosa M. Badia, and Jesus Labarta. A dependency-aware task-based programming environment for multi-core architectures. Proceedings of the 2008 IEEE International Conference on Cluster Computing, pp. 142�151, September 2008.

Rosa M. Badia, Du Du, Eduardo Huedo, Antonis Kokossis, Ignacio Martín Llorente, Rubén S. Montero, Marc de Palol, Raúl Sirvent and Constantino Vázquez. Integration of GRID superscalar and GridWay Metascheduler with the DRMAA OGF Standard. Proceedings of the Euro-Par Conference 2008, , August 2008.

J.Ejarque, M. de Palol, I. Goiri, F. Julià, J. Guitart, J.Torres and R. M. Badia. Using Semantic Technologies for Resource Allocation in Computing Service Providers. 5th IEEE International Conference on Services Computing (SCC 2008), Honolulu, Hawaii, USA, pp. 583-587 (Work-in-Progress Paper), ISBN: 978-0-7695-3283-7, July 2008.

Felix Hupfeld, Björn Kolbeck, Jan Stender, Mikael Högqvist, Toni Cortes, Jonathan Martí, Jesús Malo. FaTLease: Scalable Fault-Tolerant Lease Negotiation with Paxos. International Symposium on High-Performance Distributed Computing, Boston, MA, June 2008.

Marc Casas, Rosa M. Badia, Jesus Labarta. Automatic analysis of speedup of MPI applications. International Conference on Supercomputing 2008 ( ICS 2008),
, June 2008.

Enric Tejedor and Rosa M. Badia.. COMP Superscalar: Bringing GRID superscalar and GCM Together. 8th IEEE International Symposium on Cluster Computing and the Grid 2008, Lyon, , May 2008.

F. Guim, J. Corbalan, J. Labarta. Prediction of based Models for Evaluating Backfilling Scheduling Policies. 8th International Conference on Parallel and Distributed Computing, Applications and Technologies, , December 2007.

T. Püschel, N. Borissov, M. Macías, D. Neumann, J. Guitart, and J. Torres. Economically Enhanced Resource Management for Internet Service Utilities. 8th International Conference on Web Information Systems Engineering (WISE'07), Nancy, France, Lecture Notes on Computer Science (LNCS), Vol. 4831, pp. 335-348, ISBN: 978-3-540-76992-7, ISSN: 0302-974, December 2007.

J.L. Gonzalez and Toni Cortes. An Adaptive Data Block Placement based on Deterministic Zones (AdaptiveZ). International Conference on Grid computing, high-performAnce and Distributed Applications (GADA'07), Vilamoura, Algarve, Portugal, November 2007.

F. Guim, Julita Corbalan, Jesus Labarta. Modeling the impact of resource sharing in Backfilling Policies using the Alvio Simulator. 5th Annual Meeting of the IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication System, , October 2007.

T. Püschel, N. Borissov, D. Neumann, M. Macías, J. Guitart, and J. Torres. Extended Resource Management Using Client Classification and Economic Enhancements. 17th eChallenges e-2007 Conference & Exhibition (e-2007), The Hague, The Netherlands, Information and Communication Technologies and the Knowledge Economy, Volume 4, Expanding the Knowledge Economy; Issues, Applications, Case Studies; Part 1, ICT for Networked Enterprise, Applications, pp. 65-72, ISBN: 978-1-58603-801-4, ISSN: 1574-1230 , October 2007.

Pilar González-Férez, Juan Piernas, and Toni Cortes. The RAM Enhanced Disk Cache Project (REDCAP). 24th IEEE Conference on Mass Storage Systems and Technologies (MSST07), San Diego, California, USA, September 2007.

Alberto Sánchez, Toni Cortes, Jesús Montes, Pierre Gueant and María S. Pérez. Lessons learnt from cluster computing: How they can be applied to grid environments. The 8th Hellenic European Research on Computer Mathematics & its Applications Conference, Athens Greece, , September 2007.

Marc Casas, Rosa M. Badia, Jes�s Labarta. Automatic Phase Detection of MPI Applications. proceedings of ParCo 2007,
, September 2007.

Ivan Rodero, Francesc Guim, Julita Corbalan, Jesus Labarta. Design and Implementation of a General-Purpose API of Progress and Performance Indicators. Parallel Computing 2007, , September 2007.

Marc Casas, Rosa M. Badia, Jesús Labarta. Automatic Structure Extraction of MPI Applications Tracefiles. Europar 2007,
, August 2007.

J. Martí, J. Malo, T. Cortes. Increasing Parallelism for Workflows in the Grid. Europar 2007, Rennes, France, , August 2007.

R. Nou, F. Julià, J. Guitart, and J. Torres. Dynamic Resource Provisioning for Self-Adaptive Heterogeneous Workloads in SMP Hosting Platforms. 2nd International Conference on eBusiness (ICE-B 2007) (Short Paper), pp. 39-44, ISBN: 978-989-8111-11-1, July 2007.

Seyed Masoud Sadjadi, J. Martínez, T. Soldo, L. Atencio, Rosa M. Badia, J. Ejarque. Improving Separation of Concerns in the Development of Scientific Applications. International Conference on Software Engineering and Knowledge Engineering, , July 2007.

Eugenio Cesario, Toni Cortes, Erich Focht, Matthias Hess, Felix Hupfeld, Björn Kolbeck, Jesús Malo, Jonathan Martí, Jan Stender. XtreemFS - an object-based file system for large-scale federated IT infrastructures. LinuxTAG 2007, Berlin, Germany, , May 2007.

R. M. Badia, P. Bellens, J. Ejarque, J. Labarta, M. de Palol, J. M. Pérez, R. Sirvent and E. Tejedor. SSH GRID superscalar: a Tailored Version for Cluster. 1st Iberian Grid Infrastructure Conference (IBERGRID). Santiago de Compostela (Spain), , May 2007.

S. Reyes, A. Niño, C. Muñoz-Caro, R. Sirvent and R. M. Badia. Monitoring Large Sets of Jobs in Internet-Based Grids of Computers. 1st Iberian Grid Infrastructure Conference (IBERGRID). Santiago de Compostela (Spain), , May 2007.

Josep M. Perez, Rosa M. Badia, Jesus Labarta. Including SMP in Grids as execution platform and other extensions in GRID superscalar. IEEE International Conference on e-Science and Grid Computing (eScience 2006), , December 2006.

Pieter Bellens, Josep M. Perez, Rosa M. Badia and Jesus Labarta. CellSs: A Programming Model for the Cell BE Architecture . in proceedings of the ACM/IEEE SC 2006 Conference, , November 2006.

Róbert Lovas, Raül Sirvent, Gábor Hermann, Josep M. Pérez, Rosa M. Badia, Péter Kacsuk. Dynamic workflows in the service-oriented P-GRADE portal using GRID superscalar. 2nd Austrian Grid Symposium. Innsbruck., , September 2006.

I. Rodero, F. Guim, J. Corbalán, J. Labarta. How the JSDL can Exploit the Parallelism?. 6th IEEE International Symposium on Cluster Computing and the Grid, , May 2006.

F. Guim, I. Rodero, J. Corbalán,J. Labarta, A. Oleksiak, T. Kuczynski, D. Szejnfeld,J. Nabrzyski. Uniform Job Monitoring using the HPC-Europa Single Point of Access. International Workshop on Grid Testbeds, in conjuntion with CCGrid2006, , May 2006.

T. Olivares, T. Cortes, L. Orozco-Barbosa, F.J. Quiles, and A. Garrido. A Multithread NFS Client Architecture for Multimedia Cluster Generation. Parallel and Distributed Computing and Systems (PDCS 2003), Marina del Rey, USA, November 2003.

T. Cortes and J. Labarta . Linear Aggressive Prefetching: A way to Increase the Performance of Cooperative Caches. International Parallel Processing Symposium (IPPS'99), San Juan, Puerto Rico, April 1999.

T. Cortes and J. Labarta. PAFS: a new Generation in Cooperative Caching. International Conference on Parallel and Distributed Processing Techniques and Applications (PDPTA'98), Las Vegas, Nev, July 1998.

T. Cortes, S. Girona and J. Labarta. Avoiding the Cache-coherence Problem in Parallel/Distribute File Systems. High Performance Computing and Networking (HPCN´97), Vienna, Austria, April 1997.

T. Cortes, S. Girona and J. Labarta. PACA: A Cooperative File-system Cache for Parallel Machines. 2nd International Euro-Par Conference (Euro-Par'96), Lyon, France, August 1996.

National Conferences

M. Macías and J. Guitart. A Non-Additive Negotiation Model for Utility Computing Markets. XX Jornadas de Paralelismo (JP 2009), A Coruña, Spain, pp. 695-700, ISBN: 84-9749-346-8, September 2009.

I. Goiri, J. Guitart, and J. Torres. Elastic Management of Tasks in Virtualized Environments. XX Jornadas de Paralelismo (JP 2009), A Coruña, Spain, pp. 671-676, ISBN: 84-9749-346-8, September 2009.

G. Reig, J. Alonso, and J. Guitart. Towards High-Level SLAs with Heterogeneous Workloads: Job Resource Requirements Prediction for Deadline Schedulers. XX Jornadas de Paralelismo (JP 2009), A Coruña, Spain, pp. 653-657, ISBN: 84-9749-346-8, September 2009.

J.O. Fitó and J. Guitart. Addressing the Use of Cloud Computing for Web Hosting Providers. XX Jornadas de Paralelismo (JP 2009), A Coruña, Spain, pp. 641-646, ISBN: 84-9749-346-8, September 2009.

Pilar Gonález-Férez, Juan Piernas, and Toni Cortes . The RAM Enhanced Disk Cache Project (REDCAP). XIX Jornadas de Paralelismo, Castellón,  Spain, September 2008.

Jesús Malo, Jonathan Martí, Toni Cortes. Replica management in GRID superscalar. XVIII Jornadas de Paralelismo, Zaragoza , September 2007.

Rosa M. Badia, Pieter Bellens, Marc de Palol, Jorge Ejarque, Jesús Labarta, Josep M. Pérez, Raül Sirvent and Enric Tejedor. GRID superscalar: from the Grid to the Cell processor. Spanish Conference on e-Science Grid Computing. Madrid (Spain), , March 2007.

I. Rodero, F. Guim, J. Corbalán, J. Labarta. Extension of the JSDL for Parallel Jobs. XVII Jornadas de Paralelismo, pp. 295-300, Albacete, Spain, , September 2006.

Rosa M. Badia, Pieter Bellens, Vasilis Dialinos, Jorge Ejarque, Jesús Labarta, Josep M. Pérez and Raül Sirvent. The GRID superscalar project: Current status. XVII Jornadas de Paralelismo. Albacete (Spain), , September 2006.

Teresa Olivares, Toni Cortes, Luis Orozco, Francisco J. Quiles, Antonio Garrido . Un nuevo cliente NFS predictivo multihilo para la era multimedia. XIV Jornadas de Paralelismo, Leganés, Madrid , September 2003.

T. Cortes, S. Girona and J. Labarta. PACA: A Cooperative File-system Cache. VII Jornadas de Paralelismo, Santiago de Compostela, Spain , September 1996.

Workshops

Harald Servat, Germán Llort, Judit Giménez, Jesús Labarta. Detailed performance analysis using coarse grain sampling. PROPER 2009, , August 2009.

M. Macías and J. Guitart. Influence of Reputation in Revenue of Grid Service Providers. 2nd International Workshop on High Performance Grid Middleware (HiPerGRID 2008), Bucharest, Romania, pp. 9-16, ISSN: 2065-0701, November 2008.

M. Ejdys, U. Herman-Izycka, N. Lal, T. Kielmann, E. Tejedor and R. Badia,. Integrating Application and System Components with GCM. CoreGRID Symposium 2008, , August 2008.

Jan Stender, Björn Kolbeck, Felix Hupfeld, Eugenio Cesario, Erich Focht, Matthias Hess, Jesús Malo, and Jonathan Martí. Striping without Sacrifices: Maintaining POSIX Semantics in a Parallel File System. 1st Workshop on Large Scale Computing Systems, Boston, MA, June 2008.

Alex Duran, Josep M. Perez, Eduard Ayguade, Rosa M. Badia and Jesus Labarta. Extending the OpenMP Tasking Model to Allow Dependent Tasks. proceedings of International Workshop on OpenMP, , May 2008.

Enric Tejedor, Rosa M. Badia, Paul Naoumenko, Marcela Rivera and Cédric Dalmasso. Orchestrating a safe functional suspension of GCM components. CoreGRID Integration Workshop. Integrated Research in Grid Computing, , April 2008.

Attila Kertész, Ivan Rodero and Francesc Guim. Meta-Borkering Approaches in State-Of-The-Art Grid Resource Management. CoreGRID Integration Workshop. Integrated Research in Grid Computing, , April 2008.

Rosa M.Badia, Raül Sirvent, Marian Bubak, Wlodzimierz Funika, Piotr Machner. Performance Monitoring of Grid Superscalar:Visualization Models. CoreGRID Integration Workshop. Integrated Research in Grid Computing, , April 2008.

S. Masoud Sadjadi, Liana Fong, Rosa M. Badia, Javier Figueroa, Javier Delgado, Xabriel J. Collazo-Mojica, Khalid Saleem, Raju Rangaswami, Shu Shimizu, Hector A. Duran Limon, Pat Welsh, Sandeep Pattnaik, Anthony Praino, David Villegas, Selim Kalayci, Gargi Dasgupta, Onyeka Ezenwoye, Juan Carlos Martinez, Ivan Rodero, Shuyi Chen, Javier Muñoz, Diego Lopez, Julita Corbalan, Hugh Willoughby, Michael McFail, Christine Lisetti, Malek Adjouadi. Transparent grid enablement of weather research and forecasting. Workshop on Grid-Enabling Applications, Proceedings of the 15th ACM Mardi Gras conference, Baton Rouge (EUA), , January 2008.

Felix Hupfeld, Toni Cortes, Björn Kolbeck, Erich Focht, Matthias Hess, Jesus Malo, Jonathan Marti, Jan Stender, Eugenio Cesario. XtreemFS: a case for object-based storage in Grid data management. 3rd VLDB Workshop on Data Management in Grids, Vienna, Austria , September 2007.

M. Macías, G. Smith, O. Rana, J. Guitart, and J. Torres. Enforcing Service Level Agreements using an Economically Enhanced Resource Manager. 1st Workshop on Economic Models and Algorithms for Grid Systems (EMAGS 2007), Austin, Texas, USA, In conjunction with the 8th IEEE/ACM International Conference on Grid Computing (Grid 2007), September 2007.

Francesc Guim, Ivan Rodero, Julita Corbalan, A.Goyeneche. The Grid Backfilling: a Multi-Site Scheduling Architecture with Data Mining Prediction Techniques. CoreGRID Workshop in Grid Middleware 2007, , June 2007.

Francesc Guim, Ivan Rodero, Julita Corbalan, Jesus Labarta. Towards Uniform and Transparent Access to the Grid Universe Information Using the Palantir. CoreGRID Workshop in Grid Middleware 2007, , June 2007.

Rosa M. Badia, Raul Sirvent, Marian Bubak, Wlodzimierz Funika, Piotr Machner. Performance Monitoring of Grid Superscalar with OCM-G/G-PM: Tuning and Improvements. CoreGRID Workshop on Grid Programming Model Grid and P2P Systems Architecture Grid Systems, Tools and Environments, , June 2007.

Enric Tejedor, Rosa M. Badia , Thilo Kielmann, Vladimir Getov. A Component-Based Integrated Toolkit. CoreGRID Workshop on Grid Programming Model, Grid and P2P Systems Architecture, Grid Systems, Tools and Environments, Heraklion, Crete (Greece), , June 2007.

Francesc Guim, Julita Corbalan. A Job Self-Scheduling Policy for HPC Infrastructures. 13th Workshop on Job Scheduling Strategies for Parallel Processing (In Conjunction with ICS 2007), , June 2007.

I. Rodero,F. Guim, J. Corbalan, L.L. Fong, Y.G. Liu, S.M. Sadjadi. Looking for an Evolution of Grid Scheduling: Meta-brokering. CoreGRID Workshop in Grid Middleware 2007, , June 2007.

Ani Anciaux-Sedrakian, Rosa M. Badia, Raul Sirvent, Josep M. Perez, Thilo Kielmann, Andre Merzky. GRID superscalar and Job Mapping on the Reliable Grid Resources. CoreGRID Workshop on Grid Programming Model Grid and P2P Systems Architecture Grid Systems, Tools and Environments, , June 2007.

T. Cortes, S. Girona and J. Labarta . Design Issues of a Cooperative Cache with no Coherence Problems. 5th workshop on I/O in Parallel and Distributed Systems (IOPADS'97), San Jose, CA , November 1997.

Communications

A. Brinkmann and T. Cortes. Handling Heterogeneous Storage Devices in Clusters. IEEE Conference on Cluster Computing (Cluster 2007),, Austin, Texas (Tutorial), September 2007.

Josep M Pérez. Modelos de Progamacion para Cell BE. I Olimpiada Informática Universitaria CELL + Linux, Universidad Internacional Menendez Pelayo, Santander, , September 2007.

Raül Sirvent. GRID superscalar y sus nuevas caracterí­sticas de tolerancia a fallos. Escuela de Verano en Computación Grid: del Middleware a las Aplicaciones. Albacete, , June 2007.

T. Cortes. Parallel I/O: Lessons learnt in the last 20 years. IEEE Conference on Cluster Computing (Cluster 2004), San Diego, California (Tutorial), September 2004.

Raul Sirvent. GRID superscalar. Curso de Postgrado CSIC de Grids y e-Ciencia. Santander, , September 2007.

Jacobo Girarlt, Christine Morin, Yvon Jegu. Easing Application Execution in Grids with XtreemOS Operating System. 2nd XtreemOS summit, Ischia-Naples, Italy , August 2010.

Ramon Nou and Jacobo Girarlt. XtreemOS: applications execution management. 2nd XtreemOS summer school, Reisensburg Castle, Germany, July 2010.

Toni Cortes and Jacobo Girarlt. Advantages and challenges of application execution management. 1st XtreemOS summer school, Oxford, UK, September 2009.

T. Cortes. Adapting RAID technology to large heterogeneous clusters. HeteroPar, Austin, Texas (Invited talk), September 2007.

Rosa M. Badia. Platform Unaware Programing Models. DPA Workshop !, Edinburgh, , May 2007.

Raül Sirvent. GRID superscalar: from the Grid to the cell processor. 9th HLRS Metacomputing and Grid Workshop, , July 2006.

 
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