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題 名 | Design and Implementation of Cohesion |
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作 者 | 謝錫堃; 翁志昌; 賴安洲; 梁廷宇; 麥樹翔; | 書刊名 | Journal of Information Science and Engineering |
卷 期 | 14:4 1998.12[民87.12] |
頁 次 | 頁725-741 |
專 輯 | Special Section on Parallel Processing |
分類號 | 312.1 |
關鍵詞 | Distributed shared memory; Multiple consistency protocols; Upcall mechanism; |
語 文 | 英文(English) |
英文摘要 | This paper describes a prototype DSM system called Cohesion which supports two memory consistency models, namely, Sequential consistency and Release consistency, whithin a single program to improve performance and support a wide variety of parallel programs for the system. Memory that is sequentially consistent is further divided into object-based and conventional (page-based ) memory, where they are constructed at the user-level and kernel-level, respectively. In object-based memory, the shared data are kept consistent in terms of the granularity of an object; this is provided to improve the performance of fine-grained parallel applications that may incur a significant overhead in conventional or release memory as well as to eliminate unnecessary movement of pages which are protected in a critical section. On the other hand, the Release consistency model is supported in Cohesion to attack the problem of excessive netowrk traffic and false sharing. Cohesion programs are written in C++, and the annotation of shared objects for release and object-based memory is accomplished by inheriting a system0provided base class. Cohesion is built up on a network of Intel 486-33 personal computers which are connected by a 10Mbps Ethernet. Three application prgorams, including Matrix Multiplication, SOR, and N-body, have been employed to evaluate the efficiency of Cohesion. In addition, a Producer-Consumer program has been tested to show that the object-based memory will benefit us in a critical secion. |
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