ReQoS

As multicore processors with expanding core counts continue to dominate the server market, the overall utilization of the class of datacenters known as warehouse scale computers (WSCs) depends heavily on colocation of multiple workloads on each server to take advantage of the computational power provided by modern processors. However, many of the applications running in WSCs, such as websearch, are user-facing and have quality of service (QoS) requirements. When multiple applications are co-located on a multicore machine, contention for shared memory resources threatens application QoS as severe cross-core performance interference may occur. WSC operators are left with two options: either disregard QoS to maximize WSC utilization, or disallow the co-location of high-priority user-facing applications with other applications, resulting in low machine utilization and millions of dollars wasted.