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Distributed Shared Memory machines have communication features of both distributed (messages) and shared (memory access) architectures
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Note for distributed memory, programming model must express data location (HPF Distribute command) and invocation of messages (MPI syntax)
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For shared memory, need to express control (openMP) or processing parallelism and synchronization -- need to make certain that when variable updated, "correct" version is used by other processors accessing this variable and that values living in caches are updated
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