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seminars:seminar_09_15_09 [2017/09/20 22:02] (current)
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 +======ATLAS:​ A Scalable and High-Performance Scheduling Algorithm for Multiple Memory Controllers ======
  
 +Tuesday Sep. 15, 2009\\
 +Hamerschlag Hall D-210\\
 +4:00 pm\\
 +
 +{{:​wiki:​yoongu_pic_resized.jpg|}} ​
 +
 +**[[http://​www.ece.cmu.edu/​~yoonguk|Yoongu Kim]]**\\
 +Carnegie Mellon University\\
 +
 +=====Abstract=====
 +The large disparity between CPU and memory speed, known as the “memory wall”, is one of the most severe performance bottlenecks in computer systems. In modern multicore archi-tectures,​ this problem is further exacerbated as cores must compete among themselves for access to memory. Therefore, a scheduling algo-rithm is employed by the memory controller to resolve this contention in a way that reduces memory access latency and improves overall system throughput. Unfortunately,​ previous scheduling algorithms require very fine-grained intervention that increases hardware complexity and, consequently,​ limits their scalability to mul-tiple memory controllers.
 +In this talk, I will introduce a memory scheduling algorithm that increases system throughput by utilizing high-level memory access behavior of threads, and yet is simple enough to remain scalable. Motivated by the discovery that memory access behavior follows a Pareto distri-bution,​ ATLAS (Adaptive per-Thread Least-Attained-Service) is able to make future scheduling decisions based on threads’ past memory accesses. Evaluated across a wide variety of workloads and system configurations,​ ATLAS is shown to consistently improve system throughput compared to previously proposed memory scheduling algorithms.
 +
 +=====Bio=====
 +Yoongu Kim is a second year Ph.D. student in the Electrical and Computer Engineering department. He completed his Bache-lor’s Degree in Electrical Engineering at Seoul National Univer-sity in 2005. He researches better ways to resolve contention for shared system resources in multicore architectures. He is being advised by Onur Mutlu and Mor Harchol-Balter.
 +
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