Return fh1h2h3 csep 524 parallel computaion winter

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Unformatted text preview: Winter 2013: Chamberlain 64 Par33oned Global Address Space (PGAS) Programming Models Partitioned Global Address Space Languages (Or perhaps: partitioned global namespace languages) •  abstract concept: –  support a shared namespace on distributed memory •  permit any parallel task to access any lexically visible variable •  doesn’t matter if it’s local or remote –  establish a strong sense of ownership •  every variable has a well-defined location •  local variables are cheaper to access than remote ones The commercial: “Your shared memory convenience is in my distributed memory locality model!” “Mmmmmmmm” SIAM PP10 - Chamberlain (66) Traditional PGAS Languages •  Founding fathers: UPC, Co-Array Fortran, Titanium –  extensions to C, Fortran, and Java, respectively –  details vary, but potential for: •  arrays that are decomposed across nodes •  pointers that refer to remote objects –  note that earlier languages could also be considered PGAS, but that the term didn’t exist yet •  If I had a week to spare, we would spend some time on these first before getting to Chapel –  instead, we’ll do Chapel this week and come back to CAF and UPC next week SIAM PP10 - Chamberlain (67) Distributed Memory Chapel (ahem… “mul3- locale Chapel”) (switch to other slide decks) Using Chapel for distributed memory •  Primary change: –  CHPL_COMM=none...
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