Research Of JMS

The notion of Job Management is very important, for the purpose of strengthening the batch processing of OS, providing the mechanism of job submitting, scheduling, executing and controlling. Thereby, the system source can be utilized effectively, the network load can be balanced, and the system performance can be improved.This article points out the reasons for developing the JMS, the elementary functional elements of the JMS.The Job Management System based on JobFlow is provided with the typical model structure of C/S, and it is realized by three-layer architecture of Client, Communication Agent and Server. Client supplies complete Graphic User Interface, accomplishing the management of JobFlow and system; Communication agent accomplishes complete communication between client and server by TCP/IP network communication protocol and platform independent data communication protocol; Server supplies full support of JobFlow, The superstratum are the JobFlow Definition Subsystem and JnwEngine, which are responsible for the definition and execution of JobFlow; the understratum is the Network Queue System, which realized the schedule and execution of job, thus all kinds of sources in computer network system can be utilized in order to improve execution efficiency and reduce job cost.Aiming at the problems in Network Queuing System load sharing, this article proposes a new load sharing method called Distributed Fair Share Scheduling.