Modeling of time property and analysis of real-time optimization for virtual instruments

被引：0

作者：

Xu Q.-G. ^{[1
]}

Liu G.-X. ^{[1
]}

Gao F.-R. ^{[2
]}

机构：

[1] School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong

[2] Guangdong Institute of Metrology, Guangzhou 510405, Guangdong

来源：

Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | 2010年 / 38卷 / 01期

关键词：

Constrained optimization; Multitasking environment; Real-time system; Response time; Virtual instrument;

D O I：

10.3969/j.issn.1000-565X.2010.01.022

中图分类号：

学科分类号：

摘要：

In multitasking environment, the response time is unpredictable because the execution speed of measurement and control tasks is uncertain. In order to solve this problem, first, a response time model is put forward based on the virtual instrument architecture and the real-time working conditions. Next, real-time measuring indicators are exactly computed via the timing measurement at a microsecond level. Then, the main approaches to real-time performance optimization are proposed and experimentally verified based on the derivation of data-processing delay formula. Finally, an estimation formula for the highest data acquisition frequency is presented based on the analysis of experimental results, which enables virtual instruments to maintain stable response time under the system load as high as that with 80% CPU usage, and thus realizes the constrained optimization of real-time performance.

引用

页码：113 / 118

页数：5

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