COE 308: Computer Architecture T032 Dr' Marwan AbuAmara

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COE 308 Computer Architecture (T032)Dr. Marwan
Abu-Amara

• Chapter 6 Multiprocessor Systems (cont.)

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Shared Memory Multiprocessor Systems

• Uniform Memory Access (UMA)
• Centralized shared memory is accessible by all
  processors via an interconnection network such
  that the path length access time are about the
  same for all processors to all memory locations
• If theres equal access to peripherals, then
  system is called symmetric multiprocessor,
  otherwise its called asymmetric multiprocessor

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Shared Memory Multiprocessor Systems
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Shared Memory Multiprocessor Systems

• Cost complexity of crossbar switch grows as
  O(NM), where N processors, and M memory
  modules

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Shared Memory Multiprocessor Systems
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Shared Memory Multiprocessor Systems

• Non-Uniform Memory Access (NUMA)
• Each processor has attached a part of total
  memory
• Memory has a single address space so that any
  processor could access any memory location
  directly by using its real address
• Access time to modules depends on distance to
  processor
• Most NUMA are tree based

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Shared Memory Multiprocessor Systems