一個有效達成網頁伺服器系統負載平衡的方法

Abstract

近年來，隨著網際網路的成長，許多在網路的應用已經被發展出來以改善人類的生活，其中最有影響力的應用之一就是網頁伺服器系統。現在，很多的企業都在網頁伺服器上發展應用軟體來服務客戶，例如股票交易系統和電子商務等。因此擁有一個高效能的網頁伺服器系統就顯得重要。在這篇論文中，我們在現有的網路架構下設計一個網頁伺服器系統，並且提出一個有效的方法來達成網頁伺服器負載平衡，此方法稱作以群組化為基礎動態更新工作分配表方法。在這方法中，我們會提出一個有效的群組化方法，將具有高度關聯性的檔案分配在同一群組。接著，我們分配這些群組到適當的網頁伺服器上，並讓所有的網頁伺服器能處理相同個數的使用者要求。最後，我們動態更新工作分配表，並且長時間的維持網頁伺服器負載平衡。根據效能評估的結果，我們的方法在網頁伺服器的回應時間和負載平衡的表現上都比其它的方法要來得好。此外，不管在小規模或大規模的系統架構下，我們也都能提供更好的服務品質(QoS)。詳細的設計原理及效能評估將會在此論文中一一介紹。

Recently, with the growth of network, many applications on the network have been developed to improve the human life. One of the powerful applications is the World Wide Web system. Nowadays, many enterprises develop web applications to service clients, such as stock trading and E-commerce. Therefore, to have a high performance web server system is important. In this thesis, we design a web system based on the network infrastructure and propose an effective method called Grouping Based Dynamic Updating method to improve loading balance on web servers. In our method, we will use it to group the strongly related documents together. Then we distribute the groups among web server and keep them to handle the same number of client requests. Finally, we dynamically update dispatch table, and sustain the loading balance on web servers constantly. According to the performance evaluations, our method is superior to other schemes in response time and loading balance status. Besides, our method also can offer a better QoS no matter in small-scale or large-scale web system. The detail design concept and performance evaluations will be described in the literature.