Studies on Construction Method of Distributed Operating System Which is Adaptable to Change of Environment

在本研究中，我们研究了一种适应环境变化的分布式操作系统的构建方法。首先，在本研究中，我们开发了一种计算机资源的抽象方法，以管理彼此具有不同环境的多台计算机。在此基础上，开发了基于该方法的操作系统，并通过多方面的评估验证了该方法的有效性。在本研究中，取得了以下研究成果：1.我们开发了一种通过网络连接的多台计算机上的内存资源的提取方法。并利用该方法实现了分布式虚拟内存。我们开发了一种在多台计算机上抽象外围设备的方法。该方法实现了不依赖于每个设备位置的设备操作。该方法使操作系统能够管理具有位置透明性的设备。我们已经开发了负载平衡机制，它检查系统负载并确定每个进程应该在哪里工作。我们使用了一些应用程序对该系统进行了评估。例如，在读取文件的处理中，确认进程、内核和磁盘驱动器可以透明地工作位置。

In this research, we have investigated a new construction method of distributed operating system that is adaptable to change of environment. Firstly, in this research, we have developed an abstraction method of computer resources, in order to manage plural computers that have different environment each other. Furthermore, we have developed an operating system based on this method, and confirmed its effectiveness by various evaluation. In this research, the following results are obtained.1. We have developed an abstraction method of memory resources on plural computers connected via a network. Furthermore, by using this method, we have implemented the distributed virtual memory.2. We have developed an abstraction method of peripheral devices on plural computers. This method realizes device manipulation without depending on each device location. This method enables an operating system to manage devices with location transparency.3. We have developed the load balancing mechanism, which examines the system load and determines where each process should work.4. We have evaluated the system by using some applications. For example, in processing of reading a file, it is confirmed that the process, the kernel, and the disk driver can work location transparently.