OTERA-III: Online Test Strategies for Reliable Reconfigurable Architectures - From Reliability to Guaranteed System Performability: A Multi-Layer Approach

OTERA-III：可靠可重构架构的在线测试策略 - 从可靠性到保证系统性能：多层方法

• 批准号: 182065442
• 负责人: Professor Dr.-Ing. Jörg Henkel
• 金额: --
• 依托单位: Institut für Technische Informatik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/182065442?language=en
• 关键词: OTERA; III; Online; Test; Strategies

The OTERA Project has been funded since 2011 and is now applying for the third funding phase. In a fruitful cooperation, the two groups (CES and ITI) combined their expertise in runtime systems and reconfigurable architectures (CES), as well as efficient online test, diagnosis and fault-tolerance (ITI). This lead to 8 papers published at renowned peer-reviewed conferences and transactions. Funding Phase I and II have targeted permanent structural faults (stuck-at and transition delay fault models) and transient faults (soft errors in configuration bits, bit-flip/RAP fault model) in the reconfigurable fabric.In Funding Phase III the target architecture is a multi-tasking system with heterogeneous runtime reconfigurable resources shared among multiple tasks. The reconfigurable fabric is fine-grained and implemented on SRAM-based FPGAs. We target to improve dependability by increasing system lifetime and availability (i.e. via repair, graceful degradation, or controlled stress distribution), raising system and task reliability, and guaranteeing system performability.The architecture of this project allows to dynamically adapt the system at multiple layers. Our project spans five layers (from highest to lowest): System, Task, Accelerated Functions, Accelerators (placed into containers), and Logic. At each layer, dependability actions can be applied with impact on other layers, which spans a vast search space to achieve the dependability requirements of tasks. Thus, the OTERA project offers a platform for exploration of different multi-layer dependability strategies.The multi-layer dependability optimization aims to (i) guarantee a specified level of system performability over the system mission time (i.e. reliable system operation at a desired level of performance), (ii) satisfy the dependability of concurrently executing tasks under runtime-changing environment, functional and non-functional conditions, (iii) provide self-adaption of the system in a multi-dimensional parameter space (controllable parameters, e.g. degree of redundancy, voltage level etc.).

OTERA项目从2011年开始获得资助，目前正在申请第三阶段的资助。在一次富有成效的合作中，两个小组（CES和ITI）结合了他们在运行时系统和可重构架构（CES）以及高效在线测试、诊断和容错（ITI）方面的专业知识。这导致8篇论文在著名的同行评审会议和交易中发表。第一阶段和第二阶段的资助目标是可重构结构中的永久性结构故障（卡滞和转换延迟故障模型）和瞬态故障（配置位软错误、位翻转/RAP故障模型）。在资助阶段III中，目标体系结构是一个多任务系统，具有在多个任务之间共享的异构运行时可重构资源。可重构结构是细粒度的，并在基于sram的fpga上实现。我们的目标是通过增加系统寿命和可用性（即通过修复，优雅的退化，或控制压力分布），提高系统和任务可靠性，并保证系统的可操作性来提高可靠性。这个项目的体系结构允许在多层动态地调整系统。我们的项目跨越五个层（从最高到最低）：系统、任务、加速函数、加速器（放在容器中）和逻辑。在每一层，可靠性操作可以应用于影响其他层的操作，从而跨越巨大的搜索空间来实现任务的可靠性需求。因此，OTERA项目为探索不同的多层可靠性策略提供了一个平台。多层可靠性优化旨在(i)在系统任务时间内保证指定水平的系统性能（即在期望的性能水平下可靠地运行系统）；（ii）满足在运行时变化的环境、功能和非功能条件下并发执行任务的可靠性；（iii）在多维参数空间（可控参数，例如冗余度、电压水平等）中提供系统的自适应能力。