Abstract
The current data volume and processing requirements in a modern datacenter outgrow the performance increase offered by CPU technology scaling. In light of this trend, datacenter operators have started exploiting application-specific accelerators in order to provide the performance that is needed, without exceeding power consumption constraints. The resulting heterogeneity of resources raises the question of what type of datacenter composition is most useful and under what circumstances. However, as the resulting complexity makes the testing on real-life datacenters difficult or even prohibitive, the use of simulation tools allow datacenter planners to estimate the results of their design decisions. We have developed Het-Sim, a software simulator based on the theoretical modeling of the datacenter, its components, expected workloads, and its possible deployments. Het-Sim takes as inputs a workload and a deployment description and outputs performance metrics of interest, such as task or job latency and resource utilization. In Het-Sim one can configure several parameters, including how tasks are allocated to nodes, and estimations of how fast they execute on different accelerators. Het-Sim can be used to explore how different deployments respond to different kinds of workloads, thus allowing one to determine how to best compose a datacenter based on particular workload, performance, or budgeting requirements.
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