Search results for "mpi"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
47	Stéphane Genaud, Choopan Rattanapoka	P2P-MPI: A Peer-to-Peer Framework for Robust Execution of Message Passing Parallel Programs on Grids.	J. Grid Comput.	2007	DBLP DOI BibTeX RDF	Java, peer-to-peer, middleware, Grid, MPI
47	Arun Kumar 0004, Ganapathy Senthilkumar, Murali Krishna, Naresh Jayam, Pallav K. Baruah, Raghunath Sharma, Ashok Srinivasan, Shakti Kapoor	A Buffered-Mode MPI Implementation for the Cell BETM Processor.	International Conference on Computational Science (1)	2007	DBLP DOI BibTeX RDF	heterogeneous multi-core processors, MPI, Cell processor
47	Hyuck Han, Hyungsoo Jung 0001, Jai Wug Kim, Jongpil Lee, Youngjin Yu, Shin Gyu Kim, Heon Young Yeom	SHIELD: A Fault-Tolerant MPI for an Infiniband Cluster.	HPCC	2006	DBLP DOI BibTeX RDF	Consistent recovery, Fault-tolerance, MPI, Checkpoint, Infiniband
47	Masaki Tatezono, Naoya Maruyama, Satoshi Matsuoka	Making Wide-Area, Multi-site MPI Feasible Using Xen VM.	ISPA Workshops	2006	DBLP DOI BibTeX RDF	grid computing, MPI, virtualization, cluster computing
47	Chao Huang 0029, Gengbin Zheng, Laxmikant V. Kalé, Sameer Kumar 0001	Performance evaluation of adaptive MPI.	PPoPP	2006	DBLP DOI BibTeX RDF	processor virtualization, adaptivity, load balancing, MPI, communication optimization
47	Narayan Desai, Andrew Lusk, Rick Bradshaw, Ewing L. Lusk	MPISH: A Parallel Shell for MPI Programs.	IPDPS	2005	DBLP DOI BibTeX RDF	Scalability, MPI, System Management, System Software
47	Ron Brightwell, Keith D. Underwood	An analysis of the impact of MPI overlap and independent progress.	ICS	2004	DBLP DOI BibTeX RDF	MPI, message passing, overlap
47	Julita Corbalán, Alejandro Duran, Jesús Labarta	Dynamic Load Balancing of MPI+OpenMP Applications.	ICPP	2004	DBLP DOI BibTeX RDF	load balancing, MPI, resource management, autonomic computing, OpenMP, parallel models
47	Dale R. Shires, Ram V. Mohan	Optimization and Performance of a Fortran 90 MPI-Based Unstructured Code on Large-Scale Parallel Systems.	J. Supercomput.	2003	DBLP DOI BibTeX RDF	MPI, code optimization, unstructured grids, massively parallel
47	Jiuxing Liu, Jiesheng Wu, Sushmitha P. Kini, Pete Wyckoff, Dhabaleswar K. Panda 0001	High performance RDMA-based MPI implementation over InfiniBand.	ICS	2003	DBLP DOI BibTeX RDF	MPI, high performance computing, cluster computing, InfiniBand
47	Yuichi Tsujita, Toshiyuki Imamura, Nobuhiro Yamagishi, Hiroshi Takemiya	MPI-2 Support in Heterogeneous Computing Environment Using an SCore Cluster System.	ISPA	2003	DBLP DOI BibTeX RDF	MPICH-SCore, dynamic process creation, router process, MPI, SCore
47	Greg Bronevetsky, Daniel Marques, Keshav Pingali, Paul Stodghill	Automated application-level checkpointing of MPI programs.	PPoPP	2003	DBLP DOI BibTeX RDF	non-FIFO communication, fault-tolerance, MPI, scientific computing, application-level checkpointing
47	Joachim Worringen	Pipelining and Overlapping for MPI Collective Operations.	LCN	2003	DBLP DOI BibTeX RDF	MPI, pipelining, overlapping, SCI, collective operations
47	Michael M. Resch, Edgar Gabriel, Alfred Geiger	An Approach for MPI based Metacomputing.	HPDC	1999	DBLP DOI BibTeX RDF	IMPI, MPI, Metacomputing
46	Wei-keng Liao, Kenin Coloma, Alok N. Choudhary, Lee Ward, Eric Russell, Neil Pundit	Scalable Design and Implementations for MPI Parallel Overlapping I/O.	IEEE Trans. Parallel Distributed Syst.	2006	DBLP DOI BibTeX RDF	atomic I/O, file atomicity, file consistency, overlapping I/O, MPI, cache coherence, MPI I/O
46	Mike Tsai, Brad Penoff, Alan Wagner	A Hybrid MPI design using SCTP and iWARP.	IPDPS	2008	DBLP DOI BibTeX RDF
46	Matthew J. Koop, Terry R. Jones, Dhabaleswar K. Panda 0001	MVAPICH-Aptus: Scalable high-performance multi-transport MPI over InfiniBand.	IPDPS	2008	DBLP DOI BibTeX RDF
46	D. Prabu, V. Vanamala, Sanjeeb Kumar Deka, R. Sridharan, B. B. Prahlada Rao, N. Mohanram	Design and Implementation of a High Performance MPI for Large Scale Computing System.	ITNG	2007	DBLP DOI BibTeX RDF
46	Rajeev Thakur, William Gropp	Open Issues in MPI Implementation.	Asia-Pacific Computer Systems Architecture Conference	2007	DBLP DOI BibTeX RDF
46	Guilherme P. Pezzi, Márcia C. Cera, Elton N. Mathias, Nicolas Maillard, Philippe Olivier Alexandre Navaux	On-line Scheduling of MPI-2 Programs with Hierarchical Work Stealing.	SBAC-PAD	2007	DBLP DOI BibTeX RDF
46	Adnan Agbaria, Dong-In Kang, Karandeep Singh	LMPI: MPI for Heterogeneous Embedded Distributed Systems.	ICPADS (1)	2006	DBLP DOI BibTeX RDF
46	Yuan Tang, Graham E. Fagg, Jack J. Dongarra	Proposal of MPI Operation Level Checkpoint/Rollback and One Implementation.	CCGRID	2006	DBLP DOI BibTeX RDF
46	Lei Chai, Ranjit Noronha, Dhabaleswar K. Panda 0001	MPI over uDAPL: Can High Performance and Portability Exist Across Architectures?.	CCGRID	2006	DBLP DOI BibTeX RDF
46	Abhinav Vishnu, Gopalakrishnan Santhanaraman, Wei Huang 0003, Hyun-Wook Jin, Dhabaleswar K. Panda 0001	Supporting MPI-2 One Sided Communication on Multi-rail InfiniBand Clusters: Design Challenges and Performance Benefits.	HiPC	2005	DBLP DOI BibTeX RDF
46	Jiuxing Liu, Amith R. Mamidala, Dhabaleswar K. Panda 0001	Fast and Scalable MPI-Level Broadcast Using InfiniBand?s Hardware Multicast Support.	IPDPS	2004	DBLP DOI BibTeX RDF
46	Kathryn M. Mohror, Karen L. Karavanic	Performance Tool Support for MPI-2 on Linux.	SC	2004	DBLP DOI BibTeX RDF
46	Motohiko Matsuda, Tomohiro Kudoh, H. Tazuka, Yutaka Ishikawa	The design and implementation of an asynchronous communication mechanism for the MPI communication model.	CLUSTER	2004	DBLP DOI BibTeX RDF
46	Yuichi Tsujita	Flexible Intermediate Library for MPI-2 Support on an SCore Cluster System.	GCC (2)	2003	DBLP DOI BibTeX RDF
46	Jiesheng Wu, Jiuxing Liu, Pete Wyckoff, Dhabaleswar K. Panda 0001	Impact of On-Demand Connection Management in MPI over VIA.	CLUSTER	2002	DBLP DOI BibTeX RDF
46	Brian Van Voorst, Steven Seidel	Comparison of MPI Implementations on a Shared Memory Machine.	IPDPS Workshops	2000	DBLP DOI BibTeX RDF
46	Delphine Stéphanie Goujon, Martial Michel, Jasper Peeters, Judith Ellen Devaney	AutoMap and AutoLink: Tools for Communicating Complex and Dynamic Data-Structures Using MPI.	CANPC	1998	DBLP DOI BibTeX RDF
46	Al Geist, William Gropp, Steven Huss-Lederman, Andrew Lumsdaine, Ewing L. Lusk, William Saphir, Anthony Skjellum, Marc Snir	MPI-2: Extending the Message-Passing Interface.	Euro-Par, Vol. I	1996	DBLP DOI BibTeX RDF
46	Amitava Majumdar 0001	arallel Performance Study of Monte Carlo Photon Transport Code on Shared-, Distributed-, and Distributed-Shared-Memory Architectures.	IPDPS	2000	DBLP DOI BibTeX RDF	MPI and hybrid MPI/OpenMP programming, Tera MTA, Symmetric Multiprocessing IBM SP, Monte Carlo photon transport algorithm, OpenMP, Multi-threaded, parallel performance, Cray T3E
46	Motohiko Matsuda, Tomohiro Kudoh, Yuetsu Kodama, Ryousei Takano, Yutaka Ishikawa	The design and implementation of MPI collective operations for clusters in long-and-fast networks.	Clust. Comput.	2008	DBLP DOI BibTeX RDF	Allreduce, Grid, Broadcast, Message passing interface (MPI), Wide-area network, Collective communication
45	Manuel Saldaña, Paul Chow	TMD-MPI: An MPI Implementation for Multiple Processors Across Multiple FPGAs.	FPL	2006	DBLP DOI BibTeX RDF
45	Min Yeol Lim, Vincent W. Freeh, David K. Lowenthal	MPI and communication - Adaptive, transparent frequency and voltage scaling of communication phases in MPI programs.	SC	2006	DBLP DOI BibTeX RDF
45	Rob T. Aulwes, David J. Daniel, Nehal N. Desai, Richard L. Graham, L. Dean Risinger, Mark A. Taylor, Timothy S. Woodall, Mitchel W. Sukalski	Architecture of LA-MPI, A Network-Fault-Tolerant MPI.	IPDPS	2004	DBLP DOI BibTeX RDF
45	Douglas M. Blough, Peng Liu	FIMD-MPI: A Tool for Injecting Faults into MPI Applications.	IPDPS	2000	DBLP DOI BibTeX RDF	software-based fault injection, system-level fault tolerance, parallel computers, Message passing
45	Jean-Pierre Prost, Richard Treumann, Richard Hedges, Bin Jia, Alice E. Koniges	MPI-IO/GPFS, an optimized implementation of MPI-IO on top of GPFS.	SC	2001	DBLP DOI BibTeX RDF	GPFS, SMP node, double buffering, file hints, optimization, performance, benchmark, prefetching, MPI-IO, data shipping
44	Michael Hofmann 0002, Gudula Rünger	Fine-Grained Data Distribution Operations for Particle Codes.	PVM/MPI	2009	DBLP DOI BibTeX RDF	irregular communication, particle codes, MPI, all-to-all communication, personalized communication
44	Chantana Phongpensri, Thanarat Rungthong	Vis-OOMPI: Visual Tool for Automatic Code Generation Based on C++/OOMPI.	PVM/MPI	2008	DBLP DOI BibTeX RDF	visual parallel programming, OOMPI, message-passing programming interface, MPI
44	Antonio J. Dorta, José M. Badía, Enrique S. Quintana-Ortí, Francisco de Sande	Parallelizing Dense Linear Algebra Operations with Task Queues in.	PVM/MPI	2007	DBLP DOI BibTeX RDF	Workqueuing, MPI, cluster computing, OpenMP, distributed memory
44	Amith R. Mamidala, Abhinav Vishnu, Dhabaleswar K. Panda 0001	Efficient Shared Memory and RDMA Based Design for MPI_Allgather over InfiniBand.	PVM/MPI	2006	DBLP DOI BibTeX RDF	MPI_Allgather, MPI, Shared Memory, RDMA
44	Francisco Isidro Massetto	Hybrid MPI - a MPI implementation for hybrid distributed systems (Hybrid MPI - uma implementação MPI para ambientes distribuídos híbridos).		2007	RDF
44	Torsten Hoefler, Prabhanjan Kambadur, Richard L. Graham, Galen M. Shipman, Andrew Lumsdaine	A Case for Standard Non-blocking Collective Operations.	PVM/MPI	2007	DBLP DOI BibTeX RDF
44	Jesper Larsson Träff	Efficient Allgather for Regular SMP-Clusters.	PVM/MPI	2006	DBLP DOI BibTeX RDF
44	Gregory D. Benson, Kai Long, Peter S. Pacheco	The Performance of Parallel Disk Write Methods for Linux Multiprocessor Nodes.	PVM/MPI	2003	DBLP DOI BibTeX RDF
44	Robert B. Ross, Neill Miller, William Gropp	Implementing Fast and Reusable Datatype Processing.	PVM/MPI	2003	DBLP DOI BibTeX RDF
44	Sangbum Kim, Namyoon Woo, Heon Young Yeom, Taesoon Park, Hyoung-Woo Park	Design and Implementation of Dynamic Process Management for Grid-Enabled MPICH.	PVM/MPI	2003	DBLP DOI BibTeX RDF
44	Theewara Vorakosit, Putchong Uthayopas	Generating an Efficient Dynamics Multicast Tree under Grid Environment.	PVM/MPI	2003	DBLP DOI BibTeX RDF
44	Werner Augustin, Thomas Worsch	Usefulness and Usage of SKaMPI-Bench.	PVM/MPI	2003	DBLP DOI BibTeX RDF
44	Yuichi Tsujita, Toshiyuki Imamura, Hiroshi Takemiya, Nobuhiro Yamagishi	Stampi-I/O: A Flexible Parallel-I/O Library for Heterogeneous Computing Environment.	PVM/MPI	2002	DBLP DOI BibTeX RDF
44	G. Dick van Albada, Peter M. A. Sloot	Surfing the Grid - Dynamic Task Migration in the Polder Metacomputer Project.	PVM/MPI	2002	DBLP DOI BibTeX RDF
44	Tiago R. Baptista, Hernâni Pedroso, João Gabriel Silva	The Implementation of One-Sided Communications for WMPI II.	PVM/MPI	2001	DBLP DOI BibTeX RDF
44	Elsa M. Macías, Álvaro Suárez Sarmiento, Carmen N. Ojeda-Guerra, E. Robayna	Programming Parallel Applications with LAMGAC in a LAN-WLAN Environment.	PVM/MPI	2001	DBLP DOI BibTeX RDF
44	D. Lancaster, Cliff A. Addison, Tim Oliver	A Parallel I/O Test Suite.	PVM/MPI	1998	DBLP DOI BibTeX RDF
44	José Marinho 0001, João Gabriel Silva	WMPI - Message Passing Interface for Win32 Clusters.	PVM/MPI	1998	DBLP DOI BibTeX RDF
43	Ladislav Hluchý, Viet D. Tran, Ondrej Habala, Ján Astalos, Branislav Simo, David Froehlich	Concept of a Problem Solving Environment for Flood Forecasting.	PVM/MPI	2002	DBLP DOI BibTeX RDF	Flood Forecasting, Collaborative Problem Solving Environment, MPI Programming, Parallelization, Virtual Organization
43	Alexey L. Lastovetsky	Model-Based Optimization of MPI Collective Operations for Computational Clusters.	PVM/MPI	2009	DBLP DOI BibTeX RDF
43	Justin M. Wozniak, Bryan Jacobs, Robert Latham, Samuel Lang, Seung Woo Son 0001, Robert B. Ross	Implementing Reliable Data Structures for MPI Services in High Component Count Systems.	PVM/MPI	2009	DBLP DOI BibTeX RDF
43	Alexey N. Salnikov, Dmitry Y. Andreev	An MPI-Based System for Testing Multiprocessor and Cluster Communications.	PVM/MPI	2008	DBLP DOI BibTeX RDF
43	Francisco Javier García Blas, Florin Isaila, Jesús Carretero 0001, Thomas Großmann	Implementation and Evaluation of an MPI-IO Interface for GPFS in ROMIO.	PVM/MPI	2008	DBLP DOI BibTeX RDF	parallel programming, parallel I/O, Parallel file system
43	Yannis Mazzer, Bernard Tourancheau	MPI in Wireless Sensor Networks.	PVM/MPI	2008	DBLP DOI BibTeX RDF
43	Lars Schneidenbach, David Böhme, Bettina Schnor	Performance Issues of Synchronisation in the MPI-2 One-Sided Communication API.	PVM/MPI	2008	DBLP DOI BibTeX RDF
43	Camille Coti, Ala Rezmerita, Thomas Hérault, Franck Cappello	Grid Services for MPI.	PVM/MPI	2007	DBLP DOI BibTeX RDF
43	Aurélien Bouteiller, George Bosilca, Jack J. Dongarra	Retrospect: Deterministic Replay of MPI Applications for Interactive Distributed Debugging.	PVM/MPI	2007	DBLP DOI BibTeX RDF
43	Takesi Soga, Kouji Kurihara, Takeshi Nanri, Motoyoshi Kurokawa, Kazuaki J. Murakami	Dynamic Optimization of Load Balance in MPI Broadcast.	PVM/MPI	2007	DBLP DOI BibTeX RDF
43	Guillaume Latu, Nicolas Crouseilles, Virginie Grandgirard, Eric Sonnendrücker	Gyrokinetic Semi-lagrangian Parallel Simulation Using a Hybrid OpenMP/MPI Programming.	PVM/MPI	2007	DBLP DOI BibTeX RDF
43	Alejandro Calderón 0001, Félix García Carballeira, Florin Isaila, Rainer Keller, Alexander Schulz 0004	Fault Tolerant File Models for MPI-IO Parallel File Systems.	PVM/MPI	2007	DBLP DOI BibTeX RDF	clusters, fault-tolerance, reliability, Parallel File System, data declustering
43	Rolf Riesen	Seshat Collects MPI Traces: Extended Abstract.	PVM/MPI	2007	DBLP DOI BibTeX RDF
43	Wolfgang Schnerring, Christian Kauhaus, Dietmar Fey	A Virtual Test Environment for MPI Development: Quick Answers to Many Small Questions.	PVM/MPI	2007	DBLP DOI BibTeX RDF
43	Keith D. Underwood	Challenges and Issues in Benchmarking MPI.	PVM/MPI	2006	DBLP DOI BibTeX RDF
43	Al Geist	Too Big for MPI?	PVM/MPI	2006	DBLP DOI BibTeX RDF
43	Thomas Ludwig 0002, Stephan Krempel, Julian M. Kunkel, Frank Panse, Dulip Withanage	Tracing the MPI-IO Calls' Disk Accesses.	PVM/MPI	2006	DBLP DOI BibTeX RDF	Performance Analyzer, Trace-based Tools, PVFS2, Visualization, Parallel I/O
43	Pablo E. García, Juan Fernández 0001, Fabrizio Petrini, José M. García 0001	Assessing MPI Performance on QsNetII.	PVM/MPI	2005	DBLP DOI BibTeX RDF
43	André Luckow, Bettina Schnor	Migol: A Fault-Tolerant Service Framework for MPI Applications in the Grid.	PVM/MPI	2005	DBLP DOI BibTeX RDF
43	Diego Mostaccio, Remo Suppi, Emilio Luque	Simulation of Ecologic Systems Using MPI.	PVM/MPI	2005	DBLP DOI BibTeX RDF
43	Luis F. Romero, Eva M. Ortigosa, Sergio Romero 0001, Emilio L. Zapata	Nesting OpenMP and MPI in the Conjugate Gradient Method for Band Systems.	PVM/MPI	2004	DBLP DOI BibTeX RDF
43	William D. Gropp, Robert B. Ross, Neill Miller	Providing Efficient I/O Redundancy in MPI Environments.	PVM/MPI	2004	DBLP DOI BibTeX RDF
43	Weihang Jiang, Jiuxing Liu, Hyun-Wook Jin, Dhabaleswar K. Panda 0001, Darius Buntinas, Rajeev Thakur, William D. Gropp	Efficient Implementation of MPI-2 Passive One-Sided Communication on InfiniBand Clusters.	PVM/MPI	2004	DBLP DOI BibTeX RDF
43	Andreas Knüpfer, Dieter Kranzlmüller, Wolfgang E. Nagel	Detection of Collective MPI Operation Patterns.	PVM/MPI	2004	DBLP DOI BibTeX RDF
43	Ron Brightwell, Keith D. Underwood	Evaluation of an Eager Protocol Optimization for MPI.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Srigurunath Chakravarthi, C. R. Krishna Kumar, Anthony Skjellum, H. A. Prahalad, Bharath Seshadri	A Model for Performance Analysis of MPI Applications on Terascale Systems.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	George Almási 0001, Charles Archer, José G. Castaños, Manish Gupta 0002, Xavier Martorell, José E. Moreira, William Gropp, Silvius Vasile Rus, Brian R. Toonen	MPI on BlueGene/L: Designing an Efficient General Purpose Messaging Solution for a Large Cellular System.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Edgar A. León, Arthur B. Maccabe, Ron Brightwell	An MPI Tool to Measure Application Sensitivity to Variation in Communication Parameters.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Rolf Riesen, Ron Brightwell, Arthur B. Maccabe	Measuring MPI Latency Variance.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Baker Abdalhaq, Germán Bianchini, Ana Cortés, Tomàs Margalef, Emilio Luque	Improving Wildland Fire Prediction on MPI Clusters.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Giuseppe Ciaccio	Using a Self-connected Gigabit Ethernet Adapter as a memcpy() Low-Overhead Engine for MPI.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Sergio Briguglio, Beniamino Di Martino, Giuliana Fogaccia, Gregorio Vlad	Hierarchical MPI+OpenMP Implementation of Parallel PIC Applications on Clusters of Symmetric MultiProcessors.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Joachim Worringen, Jesper Larsson Träff, Hubert Ritzdorf	Improving Generic Non-contiguous File Access for MPI-IO.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Kyung-Lang Park, Hwang-Jik Lee, Kwang-Won Koh, Oh-Young Kwon, Sung-Yong Park, Hyoung-Woo Park, Shin-Dug Kim	Dynamic Topology Selection for High Performance MPI in the Grid Environments.	PVM/MPI	2003	DBLP DOI BibTeX RDF
43	Ron Brightwell	Ready-Mode Receive: An Optimized Receive Function for MPI.	PVM/MPI	2002	DBLP DOI BibTeX RDF
43	Douglas Antony Louis Piriyakumar, Paul Levi, Rolf Rabenseifner	Enhanced File Interoperability with Parallel MPI File-I/O in Image Processing.	PVM/MPI	2002	DBLP DOI BibTeX RDF	File Interoperability, Image processing and Human recognition, Parallel Algorithms, Computational Models, Supercomputer
43	John Yiannis Cotronis, Zacharias Tsiatsoulis	Modular MPI and PVM Components.	PVM/MPI	2002	DBLP DOI BibTeX RDF
43	Constantine Bekas, Effrosini Kokiopoulou, Efstratios Gallopoulos, Valeria Simoncini	Parallel Computation of Pseudospectra Using Transfer Functions on a MATLAB-MPI Cluster Platform.	PVM/MPI	2002	DBLP DOI BibTeX RDF
43	Anton Selikhov, George Bosilca, Cécile Germain, Gilles Fedak, Franck Cappello	MPICH-CM: A Communication Library Design for a P2P MPI Implementation.	PVM/MPI	2002	DBLP DOI BibTeX RDF
43	Jesper Larsson Träff	Improved MPI All-to-all Communication on a Giganet SMP Cluster.	PVM/MPI	2002	DBLP DOI BibTeX RDF
43	Hong Linh Truong 0001, Thomas Fahringer, Michael Geissler, Georg Madsen	Performance Analysis for MPI Applications with SCALEA.	PVM/MPI	2002	DBLP DOI BibTeX RDF
43	Angela Di Serio, María-Blanca Ibáñez-Espiga	Evaluation of a Nearest-Neighbor Load Balancing Strategy for Parallel Molecular Simulations in MPI Environment.	PVM/MPI	2002	DBLP DOI BibTeX RDF
43	Thomas Worsch, Ralf H. Reussner, Werner Augustin	On Benchmarking Collective MPI Operations.	PVM/MPI	2002	DBLP DOI BibTeX RDF