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Distributed shared memory (DSM) combines the scalability of loosely coupled multicomputer systems with the ease of usability of tightly coupled multiprocessors, and allows transparent replication and caching of data. DSM has received much attention in the past decade and many consistency models, protocols, and systems were developed. We describe a new software DSM system called JIAJIA, and evaluate it with a suite of widely different applications running on an IBM SP2 cluster, a high performance computer system. Our experiments show that applications can achieve moderate to good speedups with JIAJIA and have performance comparable to the commercial TreadMarks system.