COMP10052-AAAF-03-2010-for-viewing

No interconnecon 5 in the basic model without an

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Unformatted text preview: need to take into account explicitly.   The crucial new element in distributed computa=on compared to the centralized case is the need to consider an interconnect between different elements. No Interconnec=on 5 In the basic model, without an ALGORITHM interconnect, a single DATA algorithm has (cost ­ neutral) access to a single data ­repository. A L G O   In computer architecture, this is D A T A oKen referred to as SISD (single instruc=on, single data)   ALGO D A T A A L G O DATA Interconnec=ng Storage 6       If we introduce an interconnect, we can, e.g., ALGORITHM apply an algorithm to dis=nct par==ons of a data repository DATA we have distributed for that purpose. Now, access to the data is not cost ­neutral anymore: there is A L G O a cost in going through the interconnect. In computer architecture, this D A T A is oKen referred to as SIMD (single instruc=on, mul=ple data) ALGO D A T A A L G O DATA Interconnec=ng Processors 7           We could also use the interconnect, not on par==ons of the data but rather, to apply several algorithms to the same data. Access to the data is again not cost ­ neutral: there is a cost in going through the interconnect. In computer architecture, this is oKen referred to as MISD (mul=ple instruc=on, single data). This is less generally useful in comparison to SIMD. Graphics processing units use this...
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