The Analysis of Net Factors Influence on Remote Process Monitoring

Abstract

The contribution deals with the process monitoring based on www technologies. It also researches the influence of clients‘ number and the network transfer rate on the process monitoring quality. The process monitoring is realized by the distributed application. The server part of application (written in Delphi) acquires actually measured data and sends them through the socket communication channel to the client. The client part of application is realized as applet (written in Java), which receives data from the server and executes their processing. There are some factors influencing the quality of the client–server communication on the server and client side, such as the number of running tasks, exploitation of system recourses, number of connected clients and network rate. Their influences are presented in graphical form. The first course represents a monitored signal, the second the accuracy of server’s time sending, the third the accuracy of client’s receiving and the fourth the duration of the packet transfer between the client and server. The computer working as a server is marked as S, the client is marked as K. The influence of client quality showed that the usable sample period is about 0.1s. By the study of quality of server S1 the applicable sample period 0.17s was specified. For shorter sample periods, the client isn’t capable to process received data and so occurs data buffering, which causes the time shift concerning to signal on server side. In this area monitoring is not desirable. The influence of client number showed that in the same time can correctly operate 19 to 33 clients at sample periods 0.085s to 0.33s. The influence of transfer rate showed applicability of monitoring so for local as for remote distances of clients.

Keywords

• server
• client
• applet
• socket
• communication