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Virtual network embedding for hybrid cloud rendering in optical and data center networks

光数据中心网络中面向混合云渲染的虚拟网络嵌入算法

Abstract

Animation rendering consumes massive computation time, therefore cloud rendering is emerging as a solution. Cloud rendering runs over the Data Center Network (DCN) and consolidates heterogeneous DC resources into a single cloud renderfarm, where plentiful computing resources can sufficiently accelerate any rendering process. And if one user wants to get a quick animation result, a high-speed optical interconnection is an urgent requirement, thus cloud rendering needs a convergence of Optical and DCN (ODCN) as the substrate network. In the ODCN supporting cloud rendering, each rendering task will be successfully handled only when we embed its virtual network into the cloud renderfarm. But because a virtual network includes virtual machines and virtual lightpaths, we must simultaneously perform the node-level mapping between virtual machine and server, as well as link-level mapping between virtual lightpath and fiber link(s). In addition, the joint implementation of the Photorealistic cloud Rendering (PR) and Non-Photorealistic cloud Rendering (NPR) should be considered to exhibit the unique animation effect with the low mapping cost. In this paper, considering the unique characteristic of hybrid cloud rendering, we flexibly select routing strategies according to the rendering task type. We then utilize server consolidation and traffic grooming to achieve node- and link-level mappings, respectively, thus building a mapping-cost-aware cloud renderfarm that includes multiple virtual networks. The mathematical formulation is also made with a bound analysis. Especially for the lower bound, we analyze the least number of servers and wavelengths (i.e., mapping cost) consumed by hybrid cloud rendering. In terms of heuristics, according to the processing order of rendering tasks, Smaller Virtual Resource First (SVRF) and Manycast Routing First (MRF) algorithms are proposed by us. In SVRF, NPR tasks are first tackled and then PR tasks follow. MRF is a reverse process of SVRF. The simulation results demonstrate the effectiveness of our methods in reducing the mapping cost because the heuristic solution well matches the lower bound.

创新点

  1. (1)

    为光数据中心网络数学定义了考虑混合云渲染技术特点的虚拟网络嵌入问题

  2. (2)

    证明了上述问题是NP完全的, 进而提出了两种有效的启发式算法

  3. (3)

    数学分析了上述问题的映射成本下限值, 以便在仿真中验证启发式算法的有效性。

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Correspondence to Lei Guo.

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Hou, W., Guo, L. Virtual network embedding for hybrid cloud rendering in optical and data center networks. Sci. China Inf. Sci. 59, 1–14 (2016). https://doi.org/10.1007/s11432-015-5378-7

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Keywords

  • hybrid cloud rendering
  • optical and data center network
  • virtual network embedding
  • mapping cost
  • lower bound

Keywords

  • 022310

关键词

  • 混合云渲染
  • 光数据中心网络
  • 虚拟网络嵌入
  • 映射成本
  • 下限值