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Memory Copy Optimization for Streaming Gateway Transcoding: Models and Algorithms

机译:流网关转码的内存复制优化:模型和算法

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摘要

Repeated memory copy during protocol translation inhibits capacity of a streaming media gateway. Unlike existing optimization techniques that rely on platform-specific features, this paper investigates algorithm-level platform-independent strategies. A mathematical concept of the buf-string is proposed to model the protocol transcoding process. Based on this model three payload extraction algorithms that can reduce memory copy are presented. The streaming gateway used in the Next-generation broadcasting (NGB) and the Next-generation on-demand (NGOD) system is taken as an example to demonstrate and evaluate our strategies. Experimental results from an x86 host and an embedded system prove that our strategies can reduce CPU overhead by 15% to 45%, and optimize the linear space complexity to a constant one.
机译:在协议转换期间重复进行内存复制会限制流媒体网关的容量。与依赖于平台特定功能的现有优化技术不同,本文研究了算法级别的平台独立策略。提出了buf-string的数学概念来对协议转码过程进行建模。基于该模型,提出了三种可以减少内存复制的有效载荷提取算法。以下一代广播(NGB)和下一代点播(NGOD)系统中使用的流网关为例,以演示和评估我们的策略。来自x86主机和嵌入式系统的实验结果证明,我们的策略可以将CPU开销减少15%至45%,并将线性空间复杂度优化为恒定值。

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