The Architecture of a Next Gereration Hultimedia Server

该项目包括以下三个主题：1. ReVolver/C40：体绘制体系结构我们开发了一个原型的ReVolver/C40体绘制体系结构作为下一代多媒体服务器的可视化机制。体绘制是一种直接显示体数据的方法，但由于内存的存储体冲突，使得体绘制难以实时执行。ReVolver/C40具有无存储体冲突的存储系统。对所开发的原型系统的评价结果表明，ReVolver/C40的渲染速度约为每秒6帧.一种控制驱动和数据驱动的混合处理器体系结构我们提出了Dualflow作为下一代多媒体服务器的处理器体系结构。该架构不定义寄存器，指令直接传递操作数。超标量用CAM实现指令调度逻辑，该逻辑可能成为系统的关键路径。Dualflow可以用RAM代替CAM。我们开发了一个编译器，并使用SPEC基准测试进行了评估。结果表明，它插入了大量的额外指令，并需要另一个优化，以消除他们. Java字节码的高速执行下一代多媒体服务器需要Java字节码的高速执行。我们提出了一个价值旁视缓冲区。值后备缓冲区存储过去执行的前状态和后状态对。当机器状态与存储的前状态之一匹配时，它可以通过用后状态替换它来消除执行。仿真结果表明，该算法最大可提高47.1%的速度。

The project consists of following three themes :1. ReVolver/C40: a volume rendering architectureWe developed a prototype of the ReVolver/C40 volume rendering architecture as a visualization mechanism for the next generation multimedia server. Volume rendering, which is a scheme to directly visualize volume data, is hard to execute in real-time because of bank conflict on the memory. ReVolver/C40 has a memory system free from bank conflict. The evaluation result of developed prototype shows that ReVolver/C40 can render about six frames per second.2. A hybrid processor architecture between control-and data-drivenWe proposed Dualflow as a processor architecture for the next generation multimedia server. The architecture does not define registers and the instructions pass operands directly. Superscalars implements the instruction scheduling logic with a CAM, and the logic may become the critical path of the system. Dualflow can replace the CAM with a RAM. We developed a compiler and evaluated it with the SPEC benchmark. The result shows it inserts a lot of extra instructions, and needs another optimization to remove them.3. High-speed Java bytecode executionHigh-speed execution of Java bytecode is necessary for the next generation multimedia server. We proposed a Value Look-aside Buffer. Value Look-aside Buffer memorizes pairs of pre-and post-states of the past executions. When the machine states matches one of the memorized pre-states, it can eliminate the execution just by replacing it with the post-state. The results of the simulation study shows it can speeds-up about 47.1% at best.