Order Graphs and Cross-Layer Parametric Significance-Driven Modelling

Order Graphs and Cross-Layer Parametric Significance-Driven Modelling
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阶次图和跨层参数显着性驱动建模

DOI:
10.1109/acsd.2015.16
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发表时间:
2015
期刊:
2015 15th International Conference on Application of Concurrency to System Design
影响因子:
--
通讯作者:
A. Yakovlev
A. Yakovlev
中科院分区:
--
文献类型:
--
作者:
A. Rafiev;Fei Xia;A. Iliasov;Rem Gensh;Ali Aalsaud;A. Romanovsky;A. Yakovlev

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传统的分层建模方法往往具有与多级系统中自然存在的关注层相对应的抽象层。虽然在逻辑上和功能上都很直观,但对于分析和设计来说,这并不总是最佳的。例如,同一逻辑层中的系统部分在某些指标上可能不会有相同程度的贡献,例如系统功耗。当专注于特定的参数或参数集时,为了缓和分析、设计和运行时的工作,系统的不重要部分应该在更高的抽象级别上建模,而更重要的部分应该以更详细的方式建模。这种参数重要性驱动的建模方法更注重最佳参数保真度,而不是逻辑直觉。本文以系统功耗为例,提出了具有清晰层次结构的有序图(OG),并在模型抽象的多层(Order)上提供了直观的垂直缩放,从而发现了贯穿不同Order的功率比例削减,并以平面方式一起进行分析。随机活动网络(SANS)是一种很好的平面建模方法,被认为是研究利用OGS发现岩屑的技术的一个例子。在ARM Big.LITTLE多核结构的Odroid开发系统上的一系列实验为该方法提供了初步的验证。
Traditional hierarchical modelling methods tend to have layers of abstraction corresponding to naturally existing layers of concern in multi-level systems. Although logically and functionally intuitive, this is not always optimal for analysis and design. For instance, parts of a system in the same logical layer may not contribute to the same degree on some metric, e.g. system power consumption. When focusing on a specific parameter or set of parameters, to moderate the analysis, design and runtime effort, less significant parts of the system should be modelled at higher levels of abstraction and more significant ones with more detail. This parametric significance-driven modelling approach focuses more on optimal parametric fidelity than on logical intuition. Using system power consumption as an example parameter, this paper presents Order Graphs (OGs), which have a clear hierarchical structure, and provide straightforward vertical zooming across multiple layers (orders) of model abstraction, resulting in the discovery of power-proportional cuts that run through different orders to be analysed together in a flat manner. Stochastic Activity Networks (SANs), a good flat modelling method, is suggested as an example of studying techniques for cuts discovered with OGs. A series of experiments on an Odroid development system consisting of an ARM big.LITTLE multi-core structure provides initial validation for the approach.
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