Memory conflict resolution in vector supercomputers

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This paper presents a simulation study of several conflict-handling methods in shared-memory vector processors. These methods differ with respect to (1) the way memory sections are accessed, (2) the types of conflicts that may occur, (3) whether a conflict halts the vector stream or not, and (4) buffering of pending requests. In the first method, access privilege to a particular section of memory is exclusively granted to each vector stream in its own time phase. This static control strategy prevents contention in the memory interconnect at the expense of a limited capability to adapt to dynamic situations. Two dynamic methods are also considered, in which simultaneous bank conflicts and line conflicts may occur and are resolved at run time. A fourth method helps to identify the relative contribution of the different types of memory conflicts. We also study linked conflicts that occur due to buffering in the time-phased strategy.

Original languageEnglish
Pages (from-to)71-85
Number of pages15
JournalJournal of Supercomputing
Issue number1
StatePublished - Mar 1992
Externally publishedYes


  • Supercomputers
  • linked conflicts
  • memory conflicts
  • memory performance
  • vector processors


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