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实时Linux操作系统调研

  • 2026-08-18 23:12:10
实时Linux操作系统调研

现阶段的RTOS分成两个阵营:Linux阵营Linux阵营

Linux阵营:

  • VxWorks;

  • RTEMS。

Linux阵营:

  • RT-Thread

  • RT-Linux;

  • PREEMPT-RT

  • WindRiver Linux;

  • RTAI;

  • Xenomai。

常用的双内核法实时补丁有 RT-Linux、RTAI 和 Xenomai,其中RTLinux只允许以内核模块的形式提供实时应用;而RTAI和Xenomai支持在具有MMU保护的用户空间中执行实时程序。

Xenomai(从资料完备,社区活跃度,兼容性,实时性方面考虑)

2001 年 8 月由 Philippe Gerum 发起,其思想是来源于 Karim 的 ADEOS(Adoptive Domain Environment for Operating System)。发布后即被 RTAI 采用,并一度合并为 RTAI/Fusion。后于2005年独立。Xenomai 的实时性能比RTAI略差,因为其完全由 ADEOS 控制中断,而 RTAI 是由其内核对中断进行了截断,非实时的中断才交给 ADEOS,这就减少了一部分实时开销。

官方资料:https://source.denx.de/Xenomai/xenomai/-/wikis/home

网上资料:https://blog.csdn.net/pwl999/article/details/109412539 (介绍的很详细,推荐)

http://wiki.csie.ncku.edu.tw/embedded/xenomai

https://www.cnblogs.com/wsg1100/p/12864199.html

PREEMPT-RT(实时性逊于Xenomai,之前OAI使用的就是这个方案)

单内核版本的实时Linux,需要打patch。但是也有已经集成了PREEMPT-RT feature的版本,例如 Ubuntu LowLatency、rt-centos等

官方资料:https://rt.wiki.kernel.org/index.php/Main_Page

网上资料:https://blog.csdn.net/fightingskyer/article/details/118877564

https://lwn.net/Articles/146861/

RT-Thread(国产,资料丰富,而且社区活跃,但是是一个IoT OS)

RT-Thread 就是一个 IoT OS。物联网操作系统是指以操作系统内核(可以是 RTOS、Linux 等)为基础,包括如文件系统、图形库等较为完整的中间件组件,具备低功耗、安全、通信协议支持和云端连接能力的软件平台。同样的 uC/OS,FreeRTOS也是IoT OS,不适用于我们的情况。

官方资料:https://www.rt-thread.org/

WindRiver Linux(商业平台,网上资料很少)

Wind River Linux是商业级Linux,网上资料很少,不是开源版本。

官方资料:https://www.windriver.com/products/linux

RTAIARM兼容差,更新慢)

RTAI最初使用RT-Linux的方法,但后来转向在Adeos内核下运行。Adeos本质上是一个“管理程序”系统,它作为辅助任务运行Linux和实时系统,并允许两者通信。它允许在次要操作系统之间建立优先顺序,以便实时组件可以首先响应硬件事件。这种方法被认为更加灵活,并且避免了RT-Linux专利。使用RTAI仍然需要编写内核模式代码来处理任务的硬实时部分。

官方资料:https://www.rtai.org/

RT-Linux(已停更,成为历史)

RT-Linux方法是将硬件置于一个小型的硬实时系统的控制之下,并将整个Linux作为一个单一的、低优先级的任务在实时系统下运行。对实时模式的访问是通过编写一个内核模块获得的,该模块使用一组高度受限的原语。为实时模块和普通Linux用户空间之间的通信提供了通道。由于系统的实时端控制硬件并首先获得其资源,因此可以保证最大的响应时间。

RT-Linux是第一批实时性linux,可以提供硬实时,有两个版本,免费版和收费版,收费版最初由 FSMLabs(Finite State Machine Labs)公司开发,在2007年卖给了 WindRiver。之后 WindRiver 将其作为自己的产品 WindRiver Linux 的一个实时核心(real-time core)象征性的维护了一段时间,与2011年8月彻底停止更新和维护。RT-linux 的性能应该很好,WindRiver 应该是出于竞争的目的对其进行了收购,现 RT-linux 已经不再更新,因此对于我们也只能当做了解一段历史了

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  1. CONNECT:[ UseTime:0.001241s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002182s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000757s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000723s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001383s ]
  6. SELECT * FROM `set` [ RunTime:0.000624s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001598s ]
  8. SELECT * FROM `article` WHERE `id` = 510671 LIMIT 1 [ RunTime:0.025231s ]
  9. UPDATE `article` SET `lasttime` = 1787294603 WHERE `id` = 510671 [ RunTime:0.001949s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000598s ]
  11. SELECT * FROM `article` WHERE `id` < 510671 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001268s ]
  12. SELECT * FROM `article` WHERE `id` > 510671 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009602s ]
  13. SELECT * FROM `article` WHERE `id` < 510671 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005287s ]
  14. SELECT * FROM `article` WHERE `id` < 510671 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016781s ]
  15. SELECT * FROM `article` WHERE `id` < 510671 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.019502s ]
0.256897s