Search For:

Displaying 1-35 out of 35 total
Taking Advantage of Federated Cloud Storage and Multi-core Technology in Content Delivery
Found in: 2013 IEEE/ACM 6th International Conference on Utility and Cloud Computing (UCC)
By Silvestre Perez-Ortiz,Victor Sosa-Sosa,J.L. Gonzalez,Luis M. Sanchez,Jesus Carretero-Perez
Issue Date:December 2013
pp. 435-440
Cloud-based storage services are becoming key for organizations to deliver contents to end-users through the Internet. However, problems such as unavailable service, lost data risks and lack of controls over data management could arise in such a process. T...
 
Reconciling Dynamic System Sizing and Content Locality through Hierarchical Workload Forecasting
Found in: 2012 IEEE 18th International Conference on Parallel and Distributed Systems (ICPADS)
By Juan M. Tirado,Daniel Higuero,Florin Isaila,Jesus Carretero
Issue Date:December 2012
pp. 77-84
The cloud has recently surged as a promising paradigm for hosting scalable Web systems serving a large number of users with large workload variations. It makes possible to dynamically add and remove resources to horizontally scalable architectures in order...
 
Enhancing File Transfer Scheduling and Server Utilization in Data Distribution Infrastructures
Found in: 2012 IEEE 20th International Symposium on Modelling, Analysis & Simulation of Computer and Telecommunication Systems (MASCOTS)
By Daniel Higuero,Juan M. Tirado,Florin Isaila,Jesus Carretero
Issue Date:August 2012
pp. 431-438
This paper presents a methodology for efficiently solving the file transfer scheduling problem in a distributed environment. Our solution is based on the relaxation of an objective-based time-indexed formulation of a linear programming problem. The main co...
 
Guaranteed-delivery in arbitrary dimensional Wireless Sensor Networks by means of recursive virtual coordinates
Found in: 2012 IEEE Symposium on Computers and Communications (ISCC)
By Stefano Chessa,Soledad Escolar,Susanna Pelagatti,Paolo Baronti,Jesus Carretero
Issue Date:July 2012
pp. 000399-000404
Due to limitations in sensors' hardware and communication, routing in Wireless Sensor Networks (WSN) has required different approaches as compared to more powerful and conventional networks. One successful approach to the routing problem in WSN is based on...
   
Geology: Modular Georecommendation in Gossip-Based Social Networks
Found in: 2012 IEEE 32nd International Conference on Distributed Computing Systems (ICDCS)
By Jesus Carretero,Florin Isaila,Anne-Marie Kermarrec,Francois Taiani,Juan M. Tirado
Issue Date:June 2012
pp. 637-646
Geolocated social networks, combining traditional social networking features with geolocation information, have grown tremendously over the last few years. Yet, very few works have looked at implementing geolocated social networks in a fully distributed ma...
 
Multi-model prediction for enhancing content locality in elastic server infrastructures
Found in: High-Performance Computing, International Conference on
By Juan M. Tirado,Daniel Higuero,Florin Isaila,Jesus Carretero
Issue Date:December 2011
pp. 1-9
Infrastructures serving on-line applications experience dynamic workload variations depending on diverse factors such as popularity, marketing, periodic patterns, fads, trends, events, etc. Some predictable factors such as trends, periodicity or scheduled ...
 
A Power-Aware Based Storage Architecture for High Performance Computing
Found in: High Performance Computing and Communications, 10th IEEE International Conference on
By Laura Prada,Javier Garcia,J. Daniel Garcia,Jesus Carretero,Alberto Núñez
Issue Date:September 2011
pp. 17-24
The energy crisis of the last years and the ever increasing conscience about the negative effects of energy waste on the climate change have brought the sustainability both into public attention, industry, and scientific scrutiny. Energy demand has been in...
 
Optimizing Distributed Architectures to Improve Performance on Checkpointing Applications
Found in: High Performance Computing and Communications, 10th IEEE International Conference on
By Alberto Núñez,Javier Fern´ndez,Jesús Carretero,Laura Prada,Mario Blaum
Issue Date:September 2011
pp. 487-492
Nowadays, satisfying the global throughput targets of each application in High Performance Computing systems is a difficult task because of the high number of architectural configurations having a considerable impact on the overall system performance, such...
 
Predictive Data Grouping and Placement for Cloud-Based Elastic Server Infrastructures
Found in: Cluster Computing and the Grid, IEEE International Symposium on
By Juan M. Tirado, Daniel Higuero, Florin Isaila, Jesús Carretero
Issue Date:May 2011
pp. 285-294
Workload variations on Internet platforms such as YouTube, Flickr, LastFM require novel approaches to dynamic resource provisioning in order to meet QoS requirements, while reducing the Total Cost of Ownership (TCO) of the infrastructures. The economy of s...
 
New Contributions for Simulating Large Distributed Systems
Found in: Distributed Simulation and Real Time Applications, IEEE/ACM International Symposium on
By Alberto Núñez, Javier Fernández, Jesús Carretero
Issue Date:October 2010
pp. 227-230
Nowadays, simulation of large distributed environments is a very important research field. Due to the large number of components to be simulated, the execution of those simulations requires a high level of resources such as CPU and memory. Thus, in order t...
 
Design and Evaluation of Multiple-Level Data Staging for Blue Gene Systems
Found in: IEEE Transactions on Parallel and Distributed Systems
By Florin Isaila,Javier Garcia Blas,Jesus Carretero,Robert Latham,Robert Ross
Issue Date:June 2011
pp. 946-959
Parallel applications currently suffer from a significant imbalance between computational power and available I/O bandwidth. Additionally, the hierarchical organization of current Petascale systems contributes to an increase of the I/O subsystem latency. I...
 
Latency Hiding File I/O for Blue Gene Systems
Found in: Cluster Computing and the Grid, IEEE International Symposium on
By Florin Isaila, Javier Garcia Blas, Jesus Carretero, Robert Latham, Samuel Lang, Robert Ross
Issue Date:May 2009
pp. 212-219
This paper presents the design and implementation of a novel file I/O solution for Blue Gene systems. We propose a hierarchical I/O cache architecture based on open source software. Our solution is based on an asynchronous data staging strategy, which hide...
 
AHPIOS: An MPI-Based Ad Hoc Parallel I/O System
Found in: Parallel and Distributed Systems, International Conference on
By Florin Isaila, Javier Garcia Blas, Jesus Carretero, Wei-keng Liao, Alok Choudhary
Issue Date:December 2008
pp. 253-260
This paper presents the design and implementation of a portable ad-hoc parallel I/O system (AHPIOS). AHPIOS virtualizes on-demand available distributed storage resources and allows the files to be striped over several storage devices. Additionally, the des...
 
Reordering Algorithms for Increasing Locality on Multicore Processors
Found in: High Performance Computing and Communications, 10th IEEE International Conference on
By Juan C. Pichel, David E. Singh, Jesús Carretero
Issue Date:September 2008
pp. 123-130
In order to efficiently exploit available parallelism, multicore processors must address contention for shared resources as cache hierarchy. This fact becomes even more important when irregular codes are executed on them, which is the case for sparse matri...
 
M-PLAT: Multi-Programming Language Adaptive Tutor
Found in: Advanced Learning Technologies, IEEE International Conference on
By Alberto Núñez, Javier Fernández, Jose Daniel Garcia, Laura Prada, Jesús Carretero
Issue Date:July 2008
pp. 649-651
In this paper we introduce M-PLAT, an intelligent tutoring system for helping students to learn the basics of programming languages. In fact, the M-PLAT system represents a full collection of intelligent tutoring systems, and due to its modular and hierarc...
 
New Techniques for Modeling File Data Distribution on Storage Nodes
Found in: Simulation Symposium, Annual
By Alberto Núñez, Javier Fernández, Jose Daniel Garcia, Laura Prada, Jesús Carretero
Issue Date:April 2008
pp. 175-182
This paper presents a new probabilistic model which describes the way data blocks belonging to a certain file are distributed along the disk in general purpose systems. The distribution type is classified depending on the kind of File System, the file size...
 
Using Black-Box Modeling Techniques for Modern Disk Drives Service Time Simulation
Found in: Simulation Symposium, Annual
By José Daniel Garcia, Laura Prada, Javier Fernandez, Alberto Nuñez, Jesus Carretero
Issue Date:April 2008
pp. 139-145
One of the most common techniques to evaluate the performance of a computer I/O subsystem performance has been found on detailed simulation models including specific features of storage devices like disk geometry, zone splitting, caching, read-ahead buffer...
 
Optimization and evaluation of parallel I/O in BIPS3D parallel irregular application
Found in: Parallel and Distributed Processing Symposium, International
By Rosa Filgueira, David E. Singh, Florin Isaila, Jesu's Carretero, Antonio Garcia Loureiro
Issue Date:March 2007
pp. 395
This paper presents the optimization and evaluation of parallel I/O for the BIPS3D parallel irregular application, a 3-dimensional simulation of BJT and HBT bipolar devices. The parallel version of BIPS3D employs Metis, a library for partitioning graphs, f...
 
Multiple-Phase Collective I/O Technique for Improving Data Access Locality
Found in: Parallel, Distributed, and Network-Based Processing, Euromicro Conference on
By David E. Singh, Florin Isaila, Alejandro Calderon, Felix Garcia, Jesus Carretero
Issue Date:February 2007
pp. 534-542
This paper presents Multiple-Phase Collective I/O, a novel collective I/O technique for distributed memory multi-processors. Multiple-Phase Collective I/O is a refinement of two-phase collective I/O technique. The communication phase is structured into sev...
 
Integrating Logical and Physical File Models in the MPI-IO Implementation for
Found in: Cluster Computing and the Grid, IEEE International Symposium on
By Florin Isaila, David Singh, Jesus Carretero, Felix Garcia, Gabor Szeder,, Thomas Moschny
Issue Date:May 2006
pp. 462
This paper presents the design and implementation of the MPI-IO interface for the Clusterfile parallel file system. The approach offers the opportunity of achieving a high corelation between the file access patterns of parallel applications and the physica...
 
On the Reliability ofWeb Clusters with Partial Replication of Contents
Found in: Availability, Reliability and Security, International Conference on
By Jose Daniel Garcia, Jesus Carretero, Javier Fernandez, Felix Garcia, David E. Singh, Alejandro Calderon
Issue Date:April 2006
pp. 617-624
Traditionally, distributed Web servers have used two strategies for allocating files on server nodes: full replication and full distribution. While full replication provides a highly reliable solution, it limits storage capacity to the capacity of the smal...
 
High Performance Java Input/Output for Heterogeneous Distributed Computing
Found in: Computers and Communications, IEEE Symposium on
By José M. Pérez, L. M. Sanchez, Félix García, Alejandro Calderón, Jesús Carretero
Issue Date:June 2005
pp. 969-974
Currently there is a growing interest in using Java for high performance computing. Java has many advantages for high performance computing: it is based on a high-level and object-oriented programming model with support for multithreading and distributed c...
 
An Adaptive Cache Coherence Protocol Specification for Parallel Input/Output Systems
Found in: IEEE Transactions on Parallel and Distributed Systems
By Felix Garcia-Carballeira, Jesus Carretero, Alejandro Calderon, Jose M. Perez, Jose D. Garcia
Issue Date:June 2004
pp. 533-545
<p><b>Abstract</b>—Caching has been intensively used in memory and traditional file systems to improve system performance. However, the use of caching in parallel file systems and I/O libraries has been limited to I/O nodes to avoid cache...
 
Video Forwarding Techniques for Mixed Wired and Wireless Networks
Found in: Computers and Communications, IEEE Symposium on
By Javier Fernández, Jesús Carretero, Felix Garcíia, José M. Perez, Alejandro Calderón, José J. Muñoz
Issue Date:July 2003
pp. 869
During the last years, Internet video streaming has experienced a fenomenal growth. This is happening despite the notorious difficulties of transmitting data packets with a deadline over the Internet, due to variability in throughput, delays and losses. Th...
 
Data Allocation and Load Balancing for Heterogeneous Cluster Storage Systems
Found in: Cluster Computing and the Grid, IEEE International Symposium on
By Jose Maria Perez, Felix Garcia, Jesus Carretero, Alejandro Calderon, Luis Miguel Sanchez
Issue Date:May 2003
pp. 718
Distributed filesystems are a typical solution in networked environments as clusters and grids. Parallel filesystems are a typical solution in order to reach high performance I/O distributed environment, but those filesystems have some limitations in heter...
 
Enhancing Multimedia Caching Algorithm Performance Through New Interval Definition Strategies
Found in: Simulation Symposium, Annual
By Javier Fernández, Jesus Carretero, Felix Garcia, Jose M. Perez, A. Calderon
Issue Date:April 2003
pp. 175
Nowadays, multimedia systems are evolving towards integrated storage platforms that meet the requirements of deterministic applications, multimedia systems, and traditional best-effort applications altogether. These systems must incorporate a disk scheduli...
 
MAPFS_MAS: A Model of Interaction among Information Retrieval Agents
Found in: Cluster Computing and the Grid, IEEE International Symposium on
By Maria Pérez, Felix García, Jesus Carretero
Issue Date:May 2002
pp. 264
No summary available.
   
New Techniques for Collective Communications in Clusters: A Case Study with MPI
Found in: Parallel Processing, International Conference on
By Alejandro Calderón, Félix García, Jesús Carretero, Javier Fernández, Oscar Pérez
Issue Date:September 2001
pp. 0185
Abstract: This paper describes new techniques to increase the performance of collective communication operations in clusters. These techniques are based in multithreading operations and on-line data compression. The techniques proposed have been implemente...
 
A New MultiAgent Based Architecture for High Performance I/O in Clusters
Found in: Parallel Processing Workshops, International Conference on
By María S. Pérez, Félix García, Jesús Carretero
Issue Date:September 2001
pp. 0201
Abstract: This paper presents MAPFS, a MultiAgent Parallel File System for clusters. MAPFS has been conceived as a client able to interact with different existing traditional or distributed servers and provide them the parallel I/O characteristics. Therefo...
 
CONDESA: A Framework for Controlling Data Distribution on Elastic Server Architectures
Found in: IEEE Transactions on Parallel and Distributed Systems
By Juan M. Tirado,Daniel Higuero,Javier Garcia Blas,Florin Isaila,Jesus Carretero
Issue Date:August 2014
pp. 2010-2019
Applications running in today's data centers show high workload variability. While seasonal patterns, trends and expected events may help building proactive resource allocation policies, this approach has to be complemented with adaptive strategies which s...
 
Evaluation of the Feasibility of Making Large-Scale X-Ray Tomography Reconstructions on Clouds
Found in: 2014 14th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid)
By Estefania Serrano,Guzman Bermejo,Javier Garcia Blas,Jesus Carretero
Issue Date:May 2014
pp. 748-754
This work focuses on the evaluation of the suitability of Mangoose++, a medical image application for reconstruction of 3D volumes, by means of Cloud Computing. Due to the increasing resolution of panel detectors in computed tomography and the need of lowe...
 
Comparing Grid Data Transfer Technologies in the Expand Parallel File System
Found in: Parallel, Distributed, and Network-Based Processing, Euromicro Conference on
By Borja Bergua, Felix Garcia-Carballeira, Alejandro Calderon, Luis-Miguel Sanchez, Jesus Carretero
Issue Date:February 2008
pp. 110-114
Data management is one of the most important problems in grid environments. One important challenge facing grid computing is the design of a grid file system. The Global Grid Forum defines a Grid File System as a human-readable resource namespace for manag...
 
Energy management of networked, solar cells powered, wireless sensors
Found in: Proceedings of the 16th ACM international conference on Modeling, analysis & simulation of wireless and mobile systems (MSWiM '13)
By Jesus Carretero, Soledad Escolar, Stefano Chessa
Issue Date:November 2013
pp. 263-266
Solar cells combined with power management algorithms enable the dynamic scheduling of Wireless Sensor Networks applications in a reference period, where the objective of the scheduling is to maximize the application quality level while conserving an energ...
     
A hierarchical parallel storage system based on distributed memory for large scale systems
Found in: Proceedings of the 20th European MPI Users' Group Meeting (EuroMPI '13)
By Francisco Rodrigo Duro, Javier Garcia Blas, Jesus Carretero
Issue Date:September 2013
pp. 139-140
This paper presents the design and implementation of a storage system for high performance systems based on a multiple level I/O caching architecture. The solution relies on Memcached as a parallel storage system, preserving its powerful capacities such as...
     
Parallel implementation of a X-ray tomography reconstruction algorithm based on MPI and CUDA
Found in: Proceedings of the 20th European MPI Users' Group Meeting (EuroMPI '13)
By Ernesto Liria, Florin Isaila, Javier Garcia Blas, Jesus Carretero, Manuel Desco, Monica Abella
Issue Date:September 2013
pp. 217-222
Most small-animal X-ray computed tomography (CT) scanners are based on cone-beam geometry with a flat-panel detector orbiting in a circular trajectory. Image reconstruction in these systems is usually performed by approximate methods based on the algorithm...
     
 1