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Peta Ops Operating System Scaability



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Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 1 of 25 My comments are predicated on the assumption that the operating system needs to be at a minimum Unix like The PetaOps system must fit into the existing computing universe system APIs networking required middleware remote code development existing code base etc Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 2 of 25 This space intentionally left blank Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 3 of 25 At past PetaOps workshops I have sounded cynical or sour grapes Today is no exception In defense I view it as being pragmatic Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 4 of 25 If we can get the HTMT processors at 100 Ghz say 200 Gflops 5 000 processors If we are forced to go with commodity processors at say 8 Gflops each 125 000 processors Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 5 of 25 For latency hiding we need somewhere between 1 million and 100 million threads Let s stop for just a moment and think about this Okay now lets get started again Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 6 of 25 Question What is the most difficult application on the planet to parallelize Answer Unix Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 7 of 25 Where are we today The largest SSI Unix system is 256 processors We are a factor of 20 500 off the mark From first hand experience every factor of 2 increase in o s scalability induces at least a factor of 10 of effort Why is it that SGI and HP s architectures support N processor ccNUMA and the o s is at N x where x 1 Because it s hard to do otherwise Author Greg Astfalk Division HPSD Topic PetaFlopsIIConference Date February 18 1999 Slide 8 of 25 A single processor



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