【摘要】：隨著計(jì)算機(jī)技術(shù)的不斷發(fā)展，CPU和系統(tǒng)主存的性能得到了極大的提高，但依然不能滿足應(yīng)用程序日益增長(zhǎng)的內(nèi)存需求，特別是I/O設(shè)備的發(fā)展相對(duì)滯后，磁盤性能成為影響計(jì)算機(jī)整體性能的重要瓶頸。 為了提高局域網(wǎng)中內(nèi)存利用率和系統(tǒng)I/O性能，利用高速局域網(wǎng)中高帶寬、低延遲的傳輸特點(diǎn)，在現(xiàn)有研究基礎(chǔ)上，本文通過擴(kuò)充系統(tǒng)交換區(qū)容量，提高交換區(qū)換頁速度，設(shè)計(jì)和實(shí)現(xiàn)了I/O密集型應(yīng)用和內(nèi)存密集型應(yīng)用透明訪問遠(yuǎn)程內(nèi)存系統(tǒng)(NS-DSM)。該系統(tǒng)實(shí)現(xiàn)了在局域網(wǎng)范圍內(nèi)對(duì)遠(yuǎn)程內(nèi)存的透明共享。本文主要工作有以下幾點(diǎn)： 首先，為了能夠訪問其他節(jié)點(diǎn)的空閑內(nèi)存，本文在客戶端節(jié)點(diǎn)創(chuàng)建網(wǎng)絡(luò)塊設(shè)備來接收響應(yīng)訪問遠(yuǎn)程內(nèi)存的操作，，然后通過基數(shù)樹結(jié)構(gòu)查找、插入、刪除操作把系統(tǒng)內(nèi)存頁映射到遠(yuǎn)程內(nèi)存，從而實(shí)現(xiàn)對(duì)遠(yuǎn)程內(nèi)存的訪問。 其次，NS-DSM系統(tǒng)通過創(chuàng)建和激活交換空間的方法把網(wǎng)絡(luò)塊設(shè)備掛載到客戶端節(jié)點(diǎn)，從而使應(yīng)用程序能夠透明的訪問遠(yuǎn)程內(nèi)存。為了使內(nèi)存頁能夠在最大傳輸單元為1500KB的以太網(wǎng)中分片、重組后快速傳輸，系統(tǒng)通過實(shí)現(xiàn)輕量級(jí)的傳輸協(xié)議——訪問網(wǎng)絡(luò)內(nèi)存協(xié)議(ANMP)來對(duì)需要傳送的頁面進(jìn)行分片、重組以及數(shù)據(jù)包傳輸。 最后，本文設(shè)計(jì)和實(shí)現(xiàn)了客戶端-服務(wù)端服務(wù)加載和轉(zhuǎn)換策略。該策略根據(jù)系統(tǒng)內(nèi)存使用情況的不同而加載不同的狀態(tài)，并在系統(tǒng)運(yùn)行時(shí)定期檢測(cè)結(jié)點(diǎn)的空閑內(nèi)存并做相應(yīng)的服務(wù)轉(zhuǎn)換。該策略使得系統(tǒng)中各結(jié)點(diǎn)盡可能的負(fù)載均衡，從而使整個(gè)系統(tǒng)處于一個(gè)資源利用的“平衡”狀態(tài)。 NS-DSM系統(tǒng)實(shí)現(xiàn)了局域網(wǎng)內(nèi)內(nèi)存的透明共享，并且不用對(duì)系統(tǒng)內(nèi)核作任何修改，也不需要任何特殊的API或者函數(shù)庫。它對(duì)應(yīng)用程序完全透明，同時(shí)不用進(jìn)行繁雜的數(shù)據(jù)一致性檢驗(yàn)和完整性檢驗(yàn)。實(shí)驗(yàn)表明，對(duì)于大量磁盤訪問和內(nèi)存密集型的應(yīng)用，該系統(tǒng)能有效地提高系統(tǒng)整體性能和大型應(yīng)用程序的執(zhí)行速度。
[Abstract]:With the continuous development of computer technology, the performance of CPU and system main memory has been greatly improved, but still can not meet the growing memory requirements of applications, especially the development of I / O devices is lagging behind. Disk performance has become an important bottleneck affecting the overall performance of computers. In order to improve the utilization ratio of memory and the performance of system I / O in LAN, taking advantage of the transmission characteristics of high bandwidth and low delay in high speed local area network, based on the existing research, this paper expands the capacity of system switching area and improves the speed of switching area. I / O-intensive applications and memory-intensive applications are designed and implemented to transparently access remote memory systems (NS-DSM). The system realizes the transparent sharing of remote memory in LAN. The main work of this paper is as follows: first, in order to be able to access the free memory of other nodes, this paper creates a network block device in the client node to receive the operation of accessing remote memory in response, and then looks it up through the cardinality tree structure. Insert, delete operations map system memory pages to remote memory, thus enabling access to remote memory. Secondly, the NS-DSM system mounts the network block device to the client node by creating and activating the swap space, so that the application can access the remote memory transparently. In order to divide the memory pages into pieces in Ethernet, where the maximum transport unit is 1500KB, and transfer quickly after reorganization, the system implements a lightweight transport protocol, (ANMP), to slice the pages that need to be transmitted. Reorganization and packet transmission. Finally, this paper designs and implements the client-server service loading and transformation strategy. The strategy loads different states according to the system memory usage and periodically detects the free memory of the node and makes the corresponding service transformation while the system is running. The strategy makes every node in the system load balance as much as possible, thus making the whole system in a "balanced" state of resource utilization. The NS-DSM system realizes the transparent sharing of memory in the LAN, and does not need any modification to the kernel of the system, nor any special API or function library. It is completely transparent to the application without complicated data consistency checking and integrity checking. Experiments show that the system can effectively improve the overall performance of the system and the execution speed of large applications for a large number of disk access and memory intensive applications.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TP333.1

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本文編號(hào)：2300807