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• W2141376482 abstract "Software Distributed Shared Memory (SDSM) systems usually have the large coherence granularity that is imposed by the underlying virtual memory page size. To alleviate the coherence overheads such as the network traffic to preserve the coherence, or page misses caused by false sharing, relaxed memory models are widely accepted for the SDSM systems. In the relaxed memory models, when a shared page is modified, invalidation requests to other copies are deferred until a synchronization point and, in addition, the requests are transferred only to the processor acquiring the synchronization variable. On a barrier, however, the invalidation requests must be transferred to all the processors that participate in the barrier. As a result, it tends to induce heavy network traffic, and also may lead to useless page misses by false sharing. In this paper, we propose a method to alleviate the coherence overheads of barrier synchronization in shared-memory parallel programs. It performs static analysis to examine data dependency between processors across global barriers, and then inserts special primitives into the program in order to exploit the dependency information at run time. The static analysis finds out code regions where a processor modifies data that will be used only by some of the other processors. At run time, the coherence messages for the data are transferred only to the processors with the help of the inserted primitives. In particular, if the modified data will not be used by any other processors, the primitives enforce that the coherence messages are delivered only to master processor when the parallel execution of the program is finished. We evaluated the performance of this method in a 16-node software DSM system supporting AURC protocol. Program-driven simulation was performed with five benchmark programs: Jacobi, Red-black SOR, Expl, LU, and Water-nsquared. For the applications, the experimental results show that our method can reduce the coherence messages by up to about 98%, and also can improve the execution time by up to about 26%." @default.
• W2141376482 created "2016-06-24" @default.
• W2141376482 creator A5020076332 @default.
• W2141376482 creator A5022533738 @default.
• W2141376482 date "1998-11-07" @default.
• W2141376482 modified "2023-09-23" @default.
• W2141376482 title "Reducing Coherence Overhead of Barrier Synchronization in Software DSMs" @default.
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• W2141376482 doi "https://doi.org/10.5555/509058.509085" @default.
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