CSR: Small: Rethinking the Memory Hierarchy

CSR：小：重新思考内存层次结构

• 批准号: 1318943
• 负责人: Jose Renau
• 金额: $ 49.98万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-01 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1318943&HistoricalAwards=false
• 关键词: CSR; Small; Rethinking; Memory; Hierarchy

Modern multicores are designed around complex memory hierarchies thatachieve high performance with a high cost in design complexity andefficiency. The reason is that delaying the memory access just a fewcycles has an unacceptable performance impact. This proposal decouplesthe memory operations in non-critical and critical. The criticalcomponent is allowed to be incorrect which results in a system withpower savings, simplifications in the memory hierarchy, and even theremoval of complex memory coherence. The proposed sequentialconsistency model allows simple programming models without performanceor power consumption impact.This proposal addresses the challenge of excessive complexity in modernmulticore memory hierarchy. This complexity results in a power waste anddifficult programming models. For modern systems, the memory hierarchyrepresents over half of the power. The proposed decoupled executionallows an energy efficient implementation by moving the complexoperations out of the critical path. Furthermore, the proposed memoryhierarchy allows for simpler parallel applications because it avoidscomplex consistency models commonly used. This proposal solution allowsfor an efficient implementation of the simplest consistency modelavailable. Overall, the PI hopes to make fundamental advances towardenergy efficient and simpler to use memory hierarchies.

现代多核是围绕复杂的内存层次结构设计的，以设计复杂性和效率的高成本来实现高性能。原因是延迟内存访问几个周期会产生不可接受的性能影响。该方案将临界和非临界内存操作解耦。允许关键组件是不正确的，这将导致系统节省电力，简化内存层次结构，甚至消除复杂的内存一致性。提出的顺序一致性模型允许简单的编程模型，而不会对性能或功耗产生影响。该方案解决了现代多核内存结构过于复杂的问题。这种复杂性导致了功率浪费和编程模型困难。对于现代系统，内存层次结构代表了一半以上的功率。建议的解耦执行通过将复杂操作移出关键路径来实现节能。此外，提议的内存层次结构允许更简单的并行应用程序，因为它避免了通常使用的复杂的一致性模型。这个建议解决方案允许最简单的一致性模型的有效实现。总的来说，PI希望在节能和更简单的内存层次结构方面取得根本性的进步。