CSR: Small: CoreTime: Dynamic Computation Migration for Multicore System Software

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该提案开发了一种技术，允许系统软件更有效地利用多核处理器中可用的多个片上缓存。CoreTime是一个帮助数据密集型软件在多核处理器上获得良好性能的框架。数据密集型软件（如操作系统和Web服务器）可能无法从多核处理器不断提高的处理能力中获得全部好处，而是通过访问片外动态随机存取存储器（DRAM）来进行验证。CoreTime项目正在研究的一个想法的一个例子是多核芯片的每核缓存之间的全局替换策略。这种策略有可能显著提高缓存效率，例如通过防止在流行数据的冗余每核副本上浪费缓存空间。CoreTime设计的一个关键原则是，软件应该控制缓存数据如何在多核处理器的片上缓存中分布的策略。CoreTime的长期重要性在于，它将通过减轻DRAM瓶颈来提高未来多核处理器上内存密集型软件的可扩展性。CoreTime软件将作为开源软件发布。这些想法和软件将用于麻省理工学院的本科操作系统课程，让学生体验多核处理器和并发性。本科生和研究生都将进行这项研究。该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)This proposal develops a technique for allowing the multiple on-chip caches available in multicore processors to be utilized more effectively by systems software. CoreTime is a framework to help data-intensive software obtain good performance on multicore processors. Data-intensive software, such as operating systems and web servers, may not be able to obtain full benefit from the increasing processing power of multicore processors, instead being bottlenecked by access to off-chip Dynamic random access memory (DRAM). One example of an idea the CoreTime project is investigating is a global replacement policy among the per-core caches of a multicore chip. Such a policy has the potential to significantly increase caching effectiveness, for example by preventing waste of cache space on redundant per-core copies of popular data. A key principle in CoreTime's design is that software should control the policy for how cached data is spread over a multicore processor's on-chip caches.The long-term importance of CoreTime is that it will increase the scalability of memory-intensive software on future multicore processors by mitigating the DRAM botteneck. CoreTime software will be distributed as open source. The ideas and software will be used in MIT's undergraduate operating systems course, to give students experience with multicore processors and concurrency. Both undergraduates and graduate students will perform the research. This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).