CSC/ECE 506 Spring 2012/11a hn: Difference between revisions
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==Distributed Shared Memory== | ==Distributed Shared Memory== | ||
In a [http://en.wikipedia.org/wiki/Distributed_shared_memory Distributed Shared Memory (DSM)] several processors share the same address space. It is a logical abstraction of a single address space which can be accessed by all processors. | In a [http://en.wikipedia.org/wiki/Distributed_shared_memory Distributed Shared Memory (DSM)] several processors share the same address space. It is a logical abstraction of a single address space which can be accessed by all processors. Instead of implementing shared memory model with a bus support the DSM uses a more scalable and less expensive model by supporting the abstraction of shared memory by using message passing. The main memory of a cluster of processors is made to look like a single memory with a single address space. Hence a processor can access a address space held by other processors main memory. The messages/mechanism used to get data to a processor from memory is hidden from the programmer and dealt internally. | ||
===Hardware DSM=== | ===Hardware DSM=== | ||
Revision as of 05:27, 13 April 2012
In a Distributed Shared Memory (DSM) several processors share the same address space. It is a logical abstraction of a single address space which can be accessed by all processors. Instead of implementing shared memory model with a bus support the DSM uses a more scalable and less expensive model by supporting the abstraction of shared memory by using message passing. The main memory of a cluster of processors is made to look like a single memory with a single address space. Hence a processor can access a address space held by other processors main memory. The messages/mechanism used to get data to a processor from memory is hidden from the programmer and dealt internally.