A Logical Machine Monitor Using Object-Oriented Approach

• Main Authors: Tsai, Lian-Jou, 蔡亮宙
• Other Authors: Tsai, Shang-Rong
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/54751051150653693514

博士 === 國立成功大學 === 電機工程學系 === 86 === Program or User mobility in distributed computing systems is becomingincreasingly significant, since users may sometimes change their workinglocations. This dissertation proposes a Logical Machine (LM) system thatcan effectively support software environment migration and resourcemapping. The LM partitions the conventional operating systems into twoparts: the Logical Machine Operating System (LMOS) and the LogicalMachine Monitor (LMM). They are responsible for user service andsystem resource management, respectively. The LMM provides amachine independent appearance, called the Logical Machine Interface(LMI), for the upper operating system layers to provide the resources theyneed. In our experimental system, the LMM is implemented by objectoriented approach that increases maintainability and extendibility. Itcontains some disk objects that can be bound dynamically. By varying thebinds, the users get different disk characteristics. A mobile disk objectwith the mechanism of block migration on demand is implemented. It canbe incorporated with a logical machine migration facility to achieve jobmigration, i. e., the user can migrate the operating system and disk blocksto the place he or she desires. The mobile disk also simplifies themechanism of parallel processing when each server reads and processesits data portion locally. With this approach, the system resources can bemapped more flexibly, while transparency to the operating system isretained.