Shared memory architecture
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Shared memory architectures may use:
- Uniform Memory Access (UMA): all the processors share the physical memory uniformly.
- Non-Uniform Memory Access (NUMA): memory access time depends on the memory location relative to a processor.
- Cache-only memory architecture (COMA): the local memories for the processors at a node is used as cache.
- 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.
- Advanced computer architecture and parallel processing by Hesham El-Rewini et al. 2005 ISBN 978-0-471-46740-3 pages 77-80
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