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slides1b (1) - Types of Parallel Computers Two principal...

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1b.1 Types of Parallel Computers Two principal approaches: Shared memory multiprocessor Distributed memory multicomputer ITCS 4/5145 Parallel Programming, UNC-Charlotte, B. Wilkinson, 2010. Aug 26, 2010
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1b.2 Shared Memory Multiprocessor
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1b.3 Conventional Computer Consists of a processor executing a program stored in a (main) memory: Each main memory location located by its address. Addresses start at 0 and extend to 2 b - 1 when there are b bits (binary digits) in address. Main memory Processor Instructions (to processor) Data (to or from processor)
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1b.4 Shared Memory Multiprocessor System Natural way to extend single processor model - have multiple processors connected to multiple memory modules, such that each processor can access any memory module: Processors Processor-memory Interconnections Memory module One address space
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1b.5 Simplistic view of a small shared memory multiprocessor Examples: Dual Pentiums Quad Pentiums Processors Shared memory Bus
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1b.6 Real computer system have cache memory between the main memory and processors. Level 1 (L1) cache and Level 2 (L2) cache. Example Quad Shared Memory Multiprocessor Processor L2 Cache Bus interface L1 cache Processor L2 Cache Bus interface L1 cache Processor L2 Cache Bus interface L1 cache Processor L2 Cache Bus interface L1 cache Memory controller Memory Processor/ memory bus Shared memory
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1b.7 “Recent” innovation Dual-core and multi-core processors Two or more independent processors in one
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slides1b (1) - Types of Parallel Computers Two principal...

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