面向温度的片上网络设计技术研究

发布时间：2018-07-24 14:57

【摘要】：片上网络以其优越的性能逐步成为高性能片上通信的解决方案,而温度作为片上网络工作过程中的一个重要参数,影响芯片的整体性能。局部“热点”的产生会使片上网络性能降低,甚至造成器件损坏。针对局部“热点”的问题,本文基于动静态映射的方法,设计出一种监测与任务加载电路,实时监测片上网络的工作状态,并重新配置映射任务,以降低“热点”温度。此外针对任务间一对多的通讯关系,提出一种基于层次化网络结构的多播数据包拆分传输策略,并设计实现出多播片上网络。本文的主要工作如下:(1)基于映射的动态热管理方法针对片上网络处理任务时,所产生的局部“热点”问题,基于动态与静态映射相结合的方法,设计实现了监测与任务加载硬件电路。片上网络工作时,硬件电路实时监测片上网络的运行状态并收集相关参数,上传到上位机。上位机处理收集到的数据,得出局部“热点”位置,然后重新配置任务在网络中的分布,以达到“热点”的消除和转移效果。实验结果表明,这种方法能够有效降低“热点”温度,最大可降低31.6%。(2)基于层次化网络结构的多播数据包拆分传输在已有基于层次化网络结构的多播路由算法的基础上,加入了一种多播数据包两级拆分机制。该机制针对上行路径上以及上行路径相邻的目的节点。为了避免引入新的死锁情况且兼顾多播数据包的整体延迟,采用空闲拆分策略。只有当对应的拆分输出端口空闲时,才拆分传输。在不增加算法实现复杂度的前提下,降低了多播数据包的传输延迟,并设计实现出相应的多播片上网络。实验结果表明,相对于不拆分传输方式,传输延迟最大降低了50.3%。
[Abstract]:With its superior performance, the on-chip network has gradually become the solution of high-performance on-chip communication, and temperature, as an important parameter in the on-chip network operation process, affects the overall performance of the chip. The generation of local "hot spots" will degrade the performance of the on-chip network and even cause device damage. Aiming at the problem of local "hot spot", based on the method of dynamic and static mapping, this paper designs a monitoring and task loading circuit to monitor the working state of the on-chip network in real time, and reconfigure the mapping task in order to reduce the "hot spot" temperature. In addition, aiming at the one-to-many communication relationship between tasks, a multicast packet split transmission strategy based on hierarchical network structure is proposed, and a multicast on-chip network is designed and implemented. The main work of this paper is as follows: (1) the mapping based dynamic thermal management method is based on the method of combining dynamic and static mapping to solve the local "hot spot" problem caused by on-chip network processing. The hardware circuit of monitoring and task loading is designed and implemented. When the on-chip network works, the hardware circuit monitors the running state of the on-chip network in real time, collects the relevant parameters, and uploads it to the host computer. The host computer processes the collected data, obtains the local "hot spot" position, and then reconfigures the distribution of tasks in the network in order to achieve the elimination and transfer effect of "hot spot". The experimental results show that this method can effectively reduce the "hot spot" temperature, and can reduce the maximum value of 31.6b. (2) the multicast packet split transmission based on hierarchical network structure is based on the existing multicast routing algorithm based on hierarchical network structure. A two-level split mechanism for multicast packets is added. The mechanism is aimed at the destination nodes on the uplink path and adjacent to the uplink path. In order to avoid introducing new deadlock and taking into account the overall delay of multicast packets, an idle split strategy is adopted. Split the transfer only when the corresponding split output port is idle. Without increasing the complexity of the algorithm, the transmission delay of multicast packets is reduced, and the corresponding multicast on-chip network is designed and implemented. The experimental results show that the maximum transmission delay is reduced by 50.3% compared with the non-split transmission mode.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN47

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