ColocationSim: Simulate Colocation Datacenter with Microservices and Performance Interference

Kangjin Wang, Ying Li
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Abstract

Colocating Latency-Critical (LC) jobs and Best-Effort (BE) jobs on one host is the best practice to improve datacenter resource efficiency and the Colocated Job Scheduling algorithms play a key role in this scenario. But validating a new Colocated Job Scheduling algorithm at scale is usually resource-, energy- and time-consuming in the real-datacenter, therefore simulation is the first choice. Unfortunately, existing simulators are not suitable for colocation simulation because: 1) they cannot simulate microservices, which is widely adopted in LC/BE jobs; 2) they cannot simulate performance interference of colocated jobs. In this paper, we present a new simulator, ColocationSim, which 1) uses REG(Request Execution Graph) model and queue theory to simulate the behavior of microservices; 2) uses pre-trained models to simulate performance interference. Experiments show that ColocationSim can simulate performance interference of both sequential and fan-out structure microservices with high accuracy and it can also simulate more than 8,000 colocated hosts in a short time.
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ColocationSim:模拟带有微服务和性能干扰的托管数据中心
在一台主机上并置延迟关键型(LC)作业和最佳努力型(BE)作业是提高数据中心资源效率的最佳实践,并置作业调度算法在此场景中发挥关键作用。但是,在实际数据中心中,大规模验证一种新的并行作业调度算法通常需要耗费大量的资源、能源和时间,因此仿真是首选方法。不幸的是,现有的模拟器不适合主机托管模拟,因为:1)它们不能模拟微服务,这在LC/BE工作中被广泛采用;2)它们不能模拟并行作业的性能干扰。在本文中,我们提出了一个新的模拟器ColocationSim,它1)使用REG(请求执行图)模型和队列理论来模拟微服务的行为;2)使用预训练模型模拟性能干扰。实验表明,ColocationSim可以高精度地模拟顺序微服务和扇形结构微服务的性能干扰,并且可以在短时间内模拟8000多台主机。
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