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研究生:陳宗言
研究生(外文):Tsung-Yen, Chen
論文名稱:建立高速網路上叢集式快取之研究
論文名稱(外文):Building a Clustered Cache on High-Speed Networks
指導教授:黃泰一
指導教授(外文):Tai-Yi, Huang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:資訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
畢業學年度:92
語文別:英文
論文頁數:37
中文關鍵詞:叢集快取高速網路
外文關鍵詞:clusteredcachehigh-speed networks
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  • 被引用被引用:0
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近幾年來,高速網路發展迅速,像Gigabit,Myrinet以及Infiniband的傳輸速度已經逼近匯流排的傳輸速度。由於磁碟機的讀取速度相對於高速網路實在太慢,所以我們可以經由高速網路讀取遠端機器的快取檔案,這樣的讀取速度遠遠快於原本的磁碟機讀取速度。在這篇論文中,我們提出並且實做了一個通用檔案快取(Universal File Cache or UFC),它可以完整的利用並且整合所有的記憶體資源在一個用高速網路連接起來的分散式系統中。對應用軟體而言,通用檔案快取提供了一個大型並且唯讀的快取空間。任何應用軟體可透過通用檔案快取系統所提供的應用程式介面去分享檔案進而避免檔案在快去中重複的現象。為了使我們的系統容易延伸並且擴展到異質性的分散式系統中,我們將通用檔案快取實做成一個中介軟體,它包含了兩個主要的元件,cache driver和communication daemon。為了能夠快速的在通用檔案快取系統中取得檔案,我們設計了新穎並且有效率的尋找檔案演算法(file lookup algorithm)。另外還有migration和replication演算法來幫助系統管理快取檔案。在實驗中,通用檔案快取大大的增進了web server的效能,避免掉了大部分的磁碟機讀取,成功了提昇了使用通用檔案快取的應用軟體的效能。
The speed of data transmission over high-speed networks such as Gigabit, Myrinet, and Infiniband has come close to that of the system bus in modern computers. Due to the relatively low speed of disk access, reading a cached file in a remote machine connected through a high-speed network is significantly faster than reading the file from a local disk. In this paper, we propose and implement a universal file cache called UFC that fully utilizes and integrates all memory resources in a high-speed distributed system for comprehensive file caching. UFC presents to all applications a single large-scaled read-only file cache. Through a set of publicly-accessed interfaces, every application can share cached files in UFC and avoid multiple caching. To be easily extended and deployed in a heterogeneous distributed system where machines are installed with different operating systems and connected with different communication media, we develop UFC as a middleware consisting of add-on cache drivers and communication daemons built on top of the well-supported BSD socket library. To efficiently locate a file in UFC, we present a novel file lookup algorithm and a set of cache management algorithms dealing with file migrations and replications. We illustrate the performance impact of UFC by a web server that accesses a large file set. The experimental results show that, by caching files in UFC and avoiding expensive disk access, we significantly improve the performance of the web server.
Keywords: universal file cache, heterogeneous distributed systems, operating systems, clustered systems
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