Abstract: To obtain accurate quantitative data as a reference for evaluating and selecting real-time Linux system,this paper researches several more critical characteristics of the real-time preemption patch of real-time Linux operating system in-depth,and proposes a method of program instrumentation for real-time performance evaluation. In the evaluating process,it loads and runs the test program on the Linux operating system with Preempt-RT patch,gets the important system information data by testing the key position of program with code probe to evaluate its real-time performance,and does the comparison test of the interrupt response time and context switch time as the most important criteria between Linux system with Preempt-RT patch and standard Linux system based on the numerical control system platform. Experimental result shows the interrupt response time on the patch system decreases by about 10% compared with standard Linux system,while context switch time decreases by about 99%,which satisfies the hard real-time system and meets the real-time demand of numerical control applications.

Key words: real-time Linux system, real-time preemption, real-time performance, hard real-time system, code instrumentation, numerical control platform

摘要： 准确的量化数据可作为评测及选择实时Linux 系统的参考依据。研究实时Linux 系统中实时抢占补丁的关键特性,提出一种代码插桩的实时性能评测方法。在增加实时抢占补丁的Linux 操作系统上加载运行测试程序,利用 测试程序关键位置的代码探测段来获取运行系统中的重要信息,以完成实时性能的评测。对基于数控平台上该实时 系统的中断响应时间和上下文切换时间等评测指标进行测试,结果表明,与标准Linux 系统的评测指标相比,该系统 的中断响应时间和上下文切换时间分别约减少10% 和99% ,达到了硬实时系统的要求,满足数控应用的实时需求。

关键词: 实时Linux 系统, 实时抢占, 实时性能, 硬实时系统, 代码插桩, 数控平台

CLC Number: 

• TP391