Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Conference Object Evaluating Performance and Reliability of Selective Redundant Multithreading for Gpgpu Applications(CEUR-WS, 2021) Kaya,E.; Karadaş,O.F.; Öz,I.With the widespread use of GPU architectures in general-purpose computations, evaluating the soft error vulnerability of GPGPU programs and employing efficient fault tolerance techniques for more reliable execution becomes more prominent. Performing full redundancy, based on the redundant execution of the complete program, results in resource consumption and performance loss as well as energy inefficiency. Therefore, determining the most error-prone regions of the target program code and replicating only those parts maintains both high performance and acceptable error rates. In this study, we propose a partial redundant multithreading mechanism based on the soft error vulnerability of GPGPU applications and perform a trade-off analysis between performance and reliability. Firstly, we perform fault injection experiments to evaluate the SDC rates for each kernel function. Then, based on the outcome of the fault injection experiments, we determine the kernel function to-be-replicated. According to the pragmas denoting the redundancy points in the source code, our custom LLVM pass generates the code that enables the redundant execution for the specified code region. We evaluate both the reliability and performance of the redundant execution scenarios measuring the execution time of the redundant program generated by our compiler-managed redundancy technique. Our results demonstrate that protecting only the most vulnerable kernel functions enables high reliability without hurting the performance significantly. © 2021 The Authors.Conference Object Saydam Artıklı Çalıştırma için Vekil Tasarım Örüntüsü Kullanımı(CEUR Workshop Proceedings, 2018) Öz, Dündar; Öz, Sinan; Öz, IşılIn this study, we propose a transparent model for reliable execution of object-oriented software. We design a generic object-oriented programming tool for redundant software execution to provide the desired level of reliability against transient hardware faults. To achieve this, we utilize the Proxy design pattern which is one of the well-known GoF design patterns that are formed to make software systems exible and easy to maintain. Proxy design pattern provides a controlled access and a transparent mechanism for adding new functionalities to an existing object when accessing it. Combining the instruments of dynamic proxy and annotations in Java programming language, we present, Redundant- Caller, a generic, transparent, and con gurable tool for redundant execution and majority voting. Our tool takes any object and creates a dynamic proxy for it which executes the methods of the object multiple times in separate threads, and performs majority voting on the background, requiring minimum amount of change in the original user code. Thanks to annotations, users can con gure the redundant execution scheme methodwise. Our experiments demonstrate that our tool provides a signi cant level of reliability to any object-oriented software with a reasonable amount of performance degradation through multithreaded execution.