Shared memory architecture

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In computer architecture, shared memory architecture (SMA) refers to a multiprocessing design where several processors access globally shared memory.[1]

Shared memory architectures may use:[1]

In a SMA system processors communicate by reading and writing memory locations.[1] The two key problems in scaling an SMA system are:[1]

  • performance degradation due to "contention" when several processors try to access the same memory location.
  • lack of "coherence" if memory is cached and goes out of synch with the original values as modifications take place.

See also[edit]


  1. ^ a b c d Advanced computer architecture and parallel processing by Hesham El-Rewini et al. 2005 ISBN 978-0-471-46740-3 pages 77-80