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Non-blocking adaptive cycles: Deadlock avoidance for fault-tolerant interconnection networks

Non-blocking adaptive cycles: Deadlock avoidance for fault-t...

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IEEE International Conference on Cluster Computing Workshops

作者： Zarza, Gonzalo Lugones, Diego Franco, Daniel Luque, Emilio Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona Spain

ISBN: (纸本)9781424483969

The interconnection network communicates and links together the processing units of modern high-performance computing systems. In this context, network faults have an extremely high impact since most routing algorithms were not designed to tolerate faults. Because of this, just a single fault may stall messages in the network, preventing the finalization of applications, or may lead to deadlocked configurations. In this paper we introduce a scalable deadlock avoidance technique specifically designed to deal with large interconnection networks suffering from a large number of dynamic faults. Our method is based on adding one-slot deadlock avoidance buffers and does not require the use of any virtual channels. Additionally, fully-adaptive routing algorithms may be designed on the basis of our proposal. © 2010 IEEE.

关键词： Fault tolerance

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Time aware genetic algorithm for forest fire propagation prediction: exploiting multi-core platforms

Time aware genetic algorithm for forest fire propagation pre...

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作者： Artés, Tomàs Cencerrado, Andrés Cortés, Ana Margalef, Tomàs Department of Computer Architecture and Operating Systems Universitat Autònoma de Barcelona Barcelona Spain

Forest fire propagation prediction is a crucial issue when fighting these hazards as efficiently as possible. Several propagation models have been developed and integrated in computer simulators. Such models require a set of input parameters that, in some cases, are difficult to know or even estimate precisely beforehand. Therefore, a calibration technique based on genetic algorithm (GA) was introduced to reduce the uncertainty in input parameters values and improve the accuracy of the predictions. Such a technique requires the execution of a set of simulations and several iterations of the process to calibrate the values of the input parameters. To reduce the execution time of this calibration stage, an Message Passing Interface master/worker scheme was developed to distribute the simulations of one iteration among the worker processes. However, the execution time of each simulation varies drastically depending on the particular input parameters used, provoking a significant load imbalance. To overcome this imbalance and reduce execution time to operational requirements, core allocation policies have been developed. These policies are based on execution time estimation and classification of simulations according to the estimated execution time. Then, multicore capabilities of the current systems are applied to devote more resources (cores) to the longest simulations reducing the load imbalance. These simulations that are estimated as taking too long, even when many resources are devoted to them, require especial consideration. So, a generation time limit has been introduced, and three different strategies have been designed considering individuals that exceed the generation execution time limit. In the first one, the longest individuals are replaced before starting the execution with shorter individuals (Time Aware Core allocation with replacement). In the second one, these individuals are executed, but when the generation limit is reached, the individuals still ex

关键词： Calibration

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Impact of Mixed-Precision: A Way to Accelerate Data-Driven Forest Fire Spread systems 23rd

Impact of Mixed-Precision: A Way to Accelerate Data-Driven...

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23rd International Conference on Computational Science, ICCS 2023

作者： Carrillo, Carlos Margalef, Tomás Espinosa, Antonio Cortés, Ana Computer Architecture and Operating Systems Department Universitat Autónoma de Barcelona Barcelona Spain

ISBN: (纸本)9783031360206

Every year, forest fires burn thousands of hectares of forest around the world and cause significant damage to the economy and people from the affected zone. For that reason, computational fire spread models arise as useful tools to minimize the impact of wildfires. It is well known that part of the forest fire forecast error comes from the uncertainty in the input data required by the models. Different strategies have been developed to reduce the impact of this input-data uncertainty during the last few years. One of these strategies consists of introducing a data-driven calibration stage where the input parameters are adjusted according to the actual evolution of the fire using an evolutionary scheme. In particular, the approach described in this work consists of a Genetic Algorithm (GA). This calibration strategy is computationally intensive and time-consuming. In the case of natural hazards, it is necessary to maintain a balance between accuracy and time needed to calibrate the input parameters. Most scientific codes have over-engineered the numerical precision required to obtain reliable results. In this paper, we propose to use a mixed-precision methodology to accelerate the calibration of the input parameters involved in forest fire spread prediction without sacrificing the accuracy of the forecast. The proposed scheme has been tested on a real fire. The results have led us to conclude that using the mixed-precision approach does not compromise the quality of the result provided by the forest fire spread simulator and can also speed up the whole evolutionary prediction system. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Calibration

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MATE: Monitoring, analysis and tuning environment for parallel/distributed applications

MATE: Monitoring, analysis and tuning environment for parall...

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作者： Morajko, A. Caymes-Scutari, P. Margalef, T. Luque, E. Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona 08193 Bellaterra Spain

The main goal of parallel/distributed applications is to solve the considered problem as fast as possible using the available resources. In this context, the application performance becomes a crucial issue. Developers of these applications must optimize them if they are to fulfill the promise of high-performance computation. To improve performance, developers search for bottlenecks by analyzing application behavior, try to identify performance problems, determine their causes and overcome them by changing the source code of the application. Current approaches require developers to do these tasks manually and imply a high degree of expertise. Therefore, another approach is needed to help developers during the optimization process. This paper presents the dynamic tuning approach that addresses these issues. In this approach, many tasks are automated and the user intervention and required experience may be significantly reduced. An application is monitored, its performance bottlenecks are detected and it is modified automatically during execution, without recompiling or re-running it. The introduced modifications adapt the application behavior to changing conditions. We present an environment called MATE (Monitoring, Analysis and Tuning Environment) that has been developed to provide dynamic tuning of parallel/distributed applications. We also show practical experiments conducted with MATE to prove its effectiveness and profitability. Copyright © 2006 John Wiley & Sons, Ltd.

关键词： Parallel processing systems

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Speeding up target address generation using a self-indexed FTB 8th

引用

8th International Euro-Par Conference on Parallel Processing, Euro-Par 2002

作者： Moure, Juan C. Rexachs, Dolores I. Luque, Emilio Computer Architecture and Operating Systems Group Universidad Autónoma de Barcelona Barcelona08193 Spain

ISBN: (纸本)3540440496

The fetch target buffer (FTB) holds information on basic blocks to predict taken branches in the fetch stream and also their target addresses. We propose a variation to FTB, the self-indexed FTB, which, through an extra level of indirection, provides the high hit rate of a relatively large, high-associative FTB with the fast access delay of a small, direct-mapped FTB. The critical and most frequent operation –predicting the next FTB entry– is speeded up, whilst less frequent operations –such as recovering from FTB misses– are slightly slowed down. The new design is both analyzed and simulated. Performance increase on a 512-entry FTB is estimated at between 15% and 30%. © Springer-Verlag Berlin Heidelberg 2002.

关键词： computers

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A hybrid MPI+OpenMP solution of the distributed cluster-based fish schooling simulator

A hybrid MPI+OpenMP solution of the distributed cluster-base...

引用

International Conference on Computational Science, ICCS 2014

作者： Borges, Francisco Gutierrez-Milla, Albert Suppi, Remo Luque, Emilio Department of Computer Architecture and Operating Systems Universitat Autonoma de Barcelona Bellaterra Barcelona08193 Spain

Exploring the multi-core architecture is an important issue to obtaining high performance in parallel and distributed discrete-event simulations. However, the simulation features must fit on parallel programming model in order to increase the performance. In this paper we show our experience developing a hybrid MPI+OpenMP version of our parallel and distributed discreteevent individual-oriented fish schooling simulator. In the hybrid approach developed, we fit our simulation features in the following manner: the communication between the Logical Processes happens via message passing whereas the computing of the individuals by OpenMP threads. In addition, we propose a new data structure for partitioning the fish clusters which avoid the critical section in OpenMP code. As a result, the hybrid version significantly improves the total execution time for huge quantity of individuals, because it decreases both the communication and management of processes overhead, whereas it increases the utilization of cores with sharing of resources. © The Authors. Published by Elsevier B.V.

关键词： Parallel programming

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How to scale dynamic tuning to large parallel applications

How to scale dynamic tuning to large parallel applications

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2013 IEEE 37th Annual computer Software and Applications Conference, COMPSAC 2013

作者： Martinez, Andrea Sikora, Anna Cesar, Eduardo Sorribes, Joan Computer Architecture and Operating Systems Department Universitat Autonoma de Barcelona 08193 Bellaterra Barcelona Spain

ISBN: (纸本)9780769549798

Current performance analysis and tuning tools must be able to improve the performance of large-scale parallel applications. To be effective, such analysis and tuning tools must be scalable and be able to manage the dynamic behaviour of parallel applications. This work presents a scalable solution for dynamic tuning. This approach is based on a hierarchical performance analysis architecture that uses a novel information abstraction mechanism to solve local and global performance problems. We have developed a prototype implementation of the proposed analysis architecture making use of the MRNet framework. Scalability experiments have been performed using this prototype with up to 6400 application tasks. The results obtained show that the proposed analysis architecture will provide the scalability required to carry out dynamic tuning of large-scale parallel applications. © 2013 IEEE.

关键词： Scalability

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Automatic tuning in computational grids

Automatic tuning in computational grids

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8th International Workshop on Applied Parallel Computing, PARA 2006

作者： Costa, Genaro Morajko, Anna Margalef, Tomás Luque, Emilio Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona ES-08193 Bellaterra Spain

ISBN: (纸本)9783540757542

The possibility of having available massive computer resources to users opens ideas for the future of interoperability between multiple infrastructure systems. This wide system should be composed of multiple high performance resource clusters and their users should share them to solve big scientific problems. These resources have a dynamic behavior and to reach the expected performance indexes it is necessary to tune the application in an automatic and dynamic way. The MATE environment was designed to tune parallel applications running on a cluster. This paper presents the key ideas for tracking down application process in a wide distributed environment like Computational Grids. We explain how to enable the use of MATE for dynamic application optimizations in such systems. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Grid computing

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Using distributed event simulation for individual oriented models

Using distributed event simulation for individual oriented m...

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International Mediterranean Modeling Multiconference, I3M 2005, 17th European Modeling Simulation Symposium, EMSS 2005

作者： Mostaccio, Diego Suppi, Remo Luque, Emilio Department of Computer Architecture and Operating Systems Universitat Autònoma de Barcelona 08193 Bellaterra Barcelona Spain

ISBN: (纸本)2952071233

Distributed event simulation (DES) is a useful tool for high performance simulation. This type of simulation is recommended for complex models or when a high degree of model detail is needed. Fish School is an individual oriented model for fish movement and the model's complexity and computing requirements make it suitable for this type of simulation. The present work shows the design, development and distributed simulation analysis applied to individual oriented models. In order to accomplish the analysis, experimental results are compared. The experimental framework is based on different developments using two communications libraries (PVM and MPI) and two types of distributed simulation techniques (optimistic and conservative). © 2005 Frydman, LSIS.

关键词： Discrete event simulation

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An access control protocol for peer-to-peer applications using asymmetric cryptography

An access control protocol for peer-to-peer applications usi...

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36th Jahrestagung der Gesellschaft fur Informatik e.V. (GI): Informatik fur Menschen, INFORMATIK 2006

作者： Voigt, Sebastian University of Hannover Faculty of Electrical Engineering and Computer Science Institute for Systems Engineering - Computer Architecture and Operating Systems Appelstr. 4 30167 Hannover Germany

ISBN: (纸本)9783885791874

Virtual rooms and common information spaces are being used more and more frequently. In addition to internet-based solutions, ad-hoc InfoSpaces have been proposed. Their security has not been sufficiently investigated. This paper proposes a new protocol for peer-to-peer data exchange with support for access control for operations in the virtual rooms. Access rights for operations are kept in access control matrices and the security layer allows only operations from clients which are marked as allowed in the access control matrix. The protocol is based on the idea of hiding the identity of all peer-to-peer participants. Thus this protocol offers anonymity and full peer-to-peer support using asymmetric cryptography to distribute the access control matrices. This works without any central authority.

关键词： Access control

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