Research And Implementation The Network Job Manager System

With high-powered microprocessor and high-speed computer network coming, it is rather simple than possible to connect computer system consisting of a large number of CPU by high-speed network. Network job management system is such kind of middle software that founds upon the operating system, and manages the workstations or PCs of the cluster. The author of this dissertation has researched this system for a long time, after that, considering the high-speed development of the Internet application and the requirement of the user, he developed the WEB client of this system. During the course of developing, considering the heavy load of the www server itself, we brought forward to divide the whole system to two parts; one is a set of CGI programs, it sets up the HTML pages dynamically, the other is the communicating module named COM-CLIENT, which communicates with job management system server and all the CGI programs. To implement the communication between this module and the CGI programs, a set of detailed communicating protocol has been designed. In order to realize the function which the parameters of the COM-CLIENT can be changed in COM-CLIENT running, the author uses the soft restart concept in COM-CLIENT. At the same time, during the course of developing the project, the author analyzed and compared all the design pattern of the service programs, and selected the optimized pattern to implement the system.About the communication of job management system, the author is taking part in designing and development of Communication of job management system. And about the communication protocol, the author uses the Two Phrase Communication protocol. The policy of Communication Agent improves the efficiency of communication largely and shorts the protocol stack using to communication. And the policy is brought out which can work between different systems such as Win2000 and UNIX. The Tow Phrase Communication protocol guarantees the stability of communication in job management system. Therefore the system will not be crashed due to the unstable network. This protocol commits the datum to remote machines by two phases. As soon as the system finds that datum is irregular in first phase, the protocol will discard all the datum of the communication, and rollback to initialize state of communication. So the protocol decreases the invalid datum in communication and upper the efficiency of the communication.