CNS: CSR: Small: Exploiting 3D Memory for Energy-Efficient Memory-Driven Computing

半导体技术正面临着基本的物理限制，这使得在使内存更接近可重新配置的计算逻辑的架构上加速数据密集型应用的需求越来越大。三维集成电路(3DIC)似乎是内存驱动计算中最突出的技术，它使逻辑单元能够使用高带宽垂直互连访问堆叠在层中的大量内存。软件定义的技术可以提供框架，以便以整体但动态的方式利用3D和其他先进存储技术的潜在突破性性能，同时隐藏其内部复杂性。该项目专注于开发一种新的软件范例，以在新的内存体系结构上执行内存驱动计算的算法探索，并促进用于内存不受限计算的大规模并行算法的开发，具有突破性能水平的潜力。该项目将开发软件定义的3D内存(SD3DM)，作为内存驱动计算的变革层，它不仅将简单地虚拟化3D内存，而且将全面解决即将到来的大规模片上3D内存的现实，以加速数据密集型应用程序，同时共同优化能源消耗。将在算法级别开发内存访问优化，以满足吞吐量、延迟和能效等应用程序性能目标。具体地说，优化将被设计为通过(I)仔细定义特定于应用的动态数据布局，(Ii)开发用于运行时支持的特定于应用的内存控制器，以及(Iii)设计新的内存中数据置换机制来加速级间通信，从而充分利用目标体系结构的特征。将开发基于整数线性编程(ILP)和随机编程(SP)的动态数据布局，其利用3D存储器的层间流水线和并行保险库访问特性来实现数据到不同存储器组件的吞吐量和能量最优映射。数据布局算法将与特定于应用程序的存储器控制器一起开发，以便为任何给定的应用程序提供最大的流水线执行效率。建议的优化将在广泛使用的信号处理和机器学习算法上进行演示，这些算法具有不同的数据访问和逻辑使用要求。该项目的成功完成将直接导致信号处理和机器学习问题的规模显著增加，这些问题可以在新兴的3DIC平台上以以前不可能实现的速度得到解决。开发的工作可能会影响多个应用领域。调查人员将通过南加州大学的少数族裔研究机会(更多)计划，鼓励妇女、少数族裔和代表性不足的群体参与该项目。

Semiconductor technology is facing fundamental physical limits creating an increased demand for acceleration of data-intensive applications on architectures that bring memory much closer to reconfigurable compute logic. Three dimensional integrated circuits (3DIC) appear to be the most prominent technology towards memory-driven computing by enabling large amounts of memory stacked in layers to be accessed by a logic unit using high bandwidth vertical interconnects. Software-defined technologies can provide the framework for harnessing the potential breakthrough performance of 3D and other advanced memory technologies in a holistic but dynamic manner, while at the same time hiding their internal complexity. This project focuses on developing a novel software paradigm to perform algorithmic exploration of memory-driven computing on new memory architectures and facilitate the development of massively parallel algorithms for memory-unconstrained computing with the potential for breakthrough performance levels. The project will develop Software-Defined 3D Memory (SD3DM) as a transformative layer for memory-driven computing that will not simply virtualize 3D memory but will holistically address the oncoming reality of massive on-chip 3D Memory for accelerating data-intensive applications while jointly optimizing energy consumption. Memory access optimizations will be developed at the algorithm level to meet application performance objectives of throughput, latency, and energy efficiency. Specifically, the optimizations will be designed to fully exploit the characteristics of target architectures by (i) carefully defining application-specific dynamic data layouts, (ii) developing application-specific memory controllers for runtime support, and (iii) designing novel in-memory data permutation mechanisms to accelerate inter-stage communication. Integer Linear Programming (ILP) and Stochastic Programming (SP) based dynamic data layouts that exploit the interlayer pipelining and parallel vault access features of 3D memory for throughput and energy-optimal mapping of data to different memory components will be developed. Data layout algorithms will be developed in in conjunction with application-specific memory controllers to provide maximum pipeline execution efficiency for any given application. The proposed optimizations will be demonstrated on widely used signal processing and machine learning algorithms with diverse data access and logic use requirements. Successful completion of this project will directly lead to a significant increase in the size of signal processing and machine learning problems that can be solved on emerging 3DIC platforms at speeds that were not possible before. The developed work will potentially influence multiple application domains. The investigators will encourage the participation by women, minorities, and under-represented groups in the project through USC's Minority Opportunities in Research (MORE) Programs.