What is a distributed shared memory? And its advantages

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A distributed shared memory (DSM) system is a collection of many nodes/computers which are connected through some network and all have their local memories.

The DSM system manages the memory across all the nodes.

All the nodes/computers transparently interconnect and process.

The DSM also makes sure that all the nodes are accessing the virtual memory independently without any interference from other nodes. The DSM does not have any physical memory, instead, a virtual space address is shared among all the nodes, and the transfer of data occurs among them through the main memory.