RDMM: Runtime dynamic migration mechanism of distributed cache for reconfigurable array processor

Reconfigurable array processors have emerged as powerful solution to speed up computationally intensive applications. However, they may suffer from a data access bottleneck as the frequency of memory access rises. At present, the distributed cache design in the reconfigurable array processor has a large cache failure rate, and the frequent access to external memory leads to a long delay in memory access. To mitigate this problem, we present a Runtime Dynamically Migration Mechanism (RDMM) of distributed cache for reconfigurable array processor based on the feature of obvious locality and high parallelism in accessing data. This mechanism allows temporary, static data to be dynamically scheduled to migrate data with a high access frequency from the remote cache to the processor's local migration storage table based on how often the reconfigurable array processors access the remote cache. We can accurately get the data on the shortest path by way of data search strategy based on migration storage tables, thereby effectively reducing the access delay of the entire system, increasing the memory bandwidth of the reconfigurable array processor. We leverage the hardware platform of reconfigurable array processor to test the proposed mechanism. The experimental results show that RDMM reduces access delay by up to 35.24% compared with the tradition distributed cache at the highest conflict rate. And compared with the Ref.[19], Ref.[20], Ref.[21] and Ref.[23], the working frequency can be increased by 15%, the hit rate can be increased by 6.1%, and the peak bandwidth can be increased by about 3×.     

Study of trust‐based mechanism and its component model in MANET: Current research state,issues, and future recommendation

Security against routing attacks in MANET is most critical issue and traditional concepts of cryptography, authentication, or Watchdog are not that significant in mitigation of these attacks. In recent years, trust‐based approach provides a reputation system that compose of different components to provide security against routing attacks. In this paper, we provide an in‐depth analysis of various components that are used in trust‐based mechanism and techniques deployed in effective and efficient execution of task by the components. Trust‐based mechanisms generally have five components: monitoring and information gathering, trust calculation and evaluation unit, trust recommendation unit, decision‐making and dissemination of detection unit. All or some of these units cooperate together to provide a reliable communication environment with the aim to prevent routing attacks from participating in route formation process and detect attacking nodes simultaneously. Different routing attacks and measures in trust‐based mechanism along with some published work are discussed to understand the implementation of this type of mechanism. Various related issues are explored, discussed, and recommendations are pointed out for future research work in this field.     

光网络中基于路径计算单元的路由机制研究

针对大规模多层多域光网络群故障发生时的网络受损情况,提出基于路径计算单元(PCE)架构的跨域路由算法进行快速恢复,并基于OMNet平台对多层多域路由方案进行了性能仿真分析。结果表明,基于PCE架构的路由策略在群故障发生时能够大大减少网络中的路径计算请求泛洪信息,降低路由计算收敛时间,可以提高全网剩余资源的资源利用率,为业务的快速恢复提供了路由基础。