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Displaying 1-19 out of 19 total
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...
 
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...
 
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 ...
 
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...
 
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...
 
Mapping Functions and Data Redistribution for Parallel Files
Found in: Parallel and Distributed Processing Symposium, International
By Florin Isaila, Walter F. Tichy
Issue Date:April 2002
pp. 0237
A parallel file may be physically stored on several independent disks and logically partitioned by several processors. This paper presents general algorithms for mapping between two arbitrary distributions of a parallel file. Each of the two distributions ...
 
Clusterfile: A Flexible Physical Layout Parallel File System
Found in: Cluster Computing, IEEE International Conference on
By Florin Isaila, Walter F. Tichy
Issue Date:October 2001
pp. 37
This paper presents Clusterfile, a parallel file system that provides parallel file access on a cluster of computers. Existing parallel file systems offer little control over matching the I/O access patterns and file data layout. Without this matching the ...
 
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...
 
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...
 
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...
 
View-Based Collective I/O for MPI-IO
Found in: Cluster Computing and the Grid, IEEE International Symposium on
By Javier García Blas, Florin Isaila, David E. Singh, J. Carretero
Issue Date:May 2008
pp. 409-416
This paper presents the design and implementation of a new file system independent collective I/O optimization based on file views: view-based collective I/O. View-based collective I/O has been implemented and evaluated inside ROMIO implementation of MPI-I...
 
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...
 
View I/O: Improving the Performance of Non-Contiguous I/O
Found in: Cluster Computing, IEEE International Conference on
By Florin Isaila, Walter F. Tichy
Issue Date:December 2003
pp. 336
This paper presents view I/O, a non-contiguous parallel I/O technique. We show that the linear file model may be an unsuitable abstraction for non-contiguous I/O optimizations. Additionally, the poor cooperation between a file system and an I/O library lik...
 
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...
     
VIDAS: object-based virtualized data sharing for high performance storage I/O
Found in: Proceedings of the 4th ACM workshop on Scientific cloud computing (Science Cloud '13)
By Florin Isaila, Javier Blas, Pablo Llopis
Issue Date:June 2013
pp. 37-44
With scientific computing in the cloud gaining popularity and using every time larger data sets, high performance storage I/O in virtualized environments is substantially increasing in importance. However, exploiting the performance potential of the storag...
     
Integrating collective I/O and cooperative caching into the "clusterfile" parallel file system
Found in: Proceedings of the 18th annual international conference on Supercomputing (ICS '04)
By Florin Isaila, Gabor Szeder, Guido Malpohl, Vlad Olaru, Walter Tichy
Issue Date:June 2004
pp. 58-67
This paper presents the integration of two collective I/O techniques into the Clusterfile parallel file system: disk-directed I/O and two-phase I/O. We show that global cooperative cache management improves the collective I/O performance. The solution focu...
     
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