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Answer Posted / shiva
SMP is "share everything" - all CPUs in the one machine share access to the same memory resources,
the same disk resources, the same drivers, and so on. In DataStage EE, inter-process communication takes place via shared memory
MPP is "share nothing" - a number of independent machines each having its own CPUs,
its own memory, its own disks, and so on. In DataStage EE,
inter-process communication between processes on different machines takes place via TCP sockets.
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