線上即時傳呼系統的設計與效能分析研究

Abstract

線上即時傳呼系統已經廣泛被大眾使用，由於使用者必需與伺服器保持一條連線，才可以即時傳送當時的訊息，但是因為伺服器所能使用的連線有限，傳輸效率也需要保持在一定範圍之內，所以當使用者人數增加時，一般都是使用更大量的伺服器來提供服務以解決問題，但是成本相對提高很多，維護也較困難。

本論文希望研究現有線上即時傳呼系統的架構，設計高效率、可延展的線上即時傳呼系統架構，並對各種架構進行效能分析，找出各種架構正常運作下所能承受的最大人數。

Presence and Instant Messaging System is used popularly. Every user must keep a connection with the server to send messages. Since the maximum socket number of the server is limited, if the user number increases, they will increase the server number to solve this problem. But the cost will raise, and it is hard to manage.

We will study the architecture of Presence and Instant Messaging System (PIM), and design a highly efficient and scalable Presence and Instant Messaging System. Simulate and analyze the performance and scalability of the designed PIM system architectures. Find the maximum user number for PIM system architectures.