The ever-increasing communication requirements have led to the introduction of optical circuit switch (OCS) to data center, which is capable of providing more flexible bandwidth allocation compared to the electrical packet switching. However, the challenge still arises due to non-negligible reconfiguration delay of commercially available MEMS-based optical circuit switching technology, even though it provides high bandwidth with low per-bit cost and power. Additionally, existing scheduling schemes amortize long switch delay by means of reconfiguring OCS every a few 100 s of milliseconds, not only causing the degradation of the latency performance, but also incurring the low utilization of optical links. In this paper, we propose an OCS-based scheduling scheme called relay-based schedule scheme (RSS), which can leverage idle optical paths to forward traffic from remote nodes only with straightforward software modifications on controller. We evaluate the performance of the proposed scheme via OMNET++ simulator, and the results demonstrate that our proposal delivers significant benefits, including reducing the average mice flow FCTs (flow complete time) by up to 80% and reducing the end-to-end packet delay by 50% compared to non-RSS schemes.

中文翻译：

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RSS：基于中继的光数据中心网络调度方案

不断增长的通信需求已导致将光电路交换（OCS）引入数据中心，与电数据包交换相比，它能够提供更灵活的带宽分配。然而，尽管市售的基于MEMS的光电路交换技术的重新配置延迟不可忽略，但挑战仍然存在，尽管该技术以较低的每位成本和功率提供了高带宽。另外，现有的调度方案通过每几百毫秒重新配置OCS来摊销长的切换延迟，这不仅导致延迟性能下降，而且导致光链路利用率低。在本文中，我们提出了一种基于OCS的调度方案，称为基于中继的调度方案（RSS），仅通过在控制器上进行简单的软件修改，就可以利用空闲的光路从远程节点转发流量。我们通过OMNET ++模拟器评估了该方案的性能，结果表明我们的方案具有显着的优势，包括将平均鼠标流FCT（流完成时间）降低多达80％，并减少端到端的数据包延迟与非RSS计划相比，减少了50％。