One-sided vs. Two-sided Communication Paradigms on Relaxed ...

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Relaxation of Memory TransfersF U T U R E T E C H N O L O G I E S G R O U P Hypertransport transactions terms Posted (writes without ack) Non-Posted (reads or writes with Ack) Relaxation on Gemini Strict (no reodering) Default (non-posted get pass posted writes) Relaxed (all non-posted pass posted writes) Relaxation affects both in-node memory transactions and remotememory transactions Interconnect Relaxation: How to? Dynamic Routing Multiple virtual channels Why? Performance: easier way to improve throughput (BW), than to improvelatency (wire delay) Resilience and fault tolerance.LAWRENCE BERKELEY NATIONAL LABORATORY
MicrobenchmarkF U T U R E T E C H N O L O G I E S G R O U PNode 0&1UPCT 1UPCT 2...UPCT mNode 2&3UPCT 1+mUPCT 2+m...UPCT 2m Objective: DialectsCompare the performance of lowlevelAPIs <strong>vs</strong>. high level runtimes.uGNI (FMA & BTE)DMAPPBerkeley UPCCray UPCOSU MBW (MPI) Ranks: m Window: w number of outstandingnon-blocking operations. Testbed: defaultbidirectional48 communication pairsMultiple outstanding messages(Window size)• Default 1LAWRENCE BERKELEY NATIONAL LABORATORY
Page 1 and 2: F U T U R E T E C H N O L O G I E S
Page 3 and 4: MotivationF U T U R E T E C H N O L
Page 5: Hopper HardwareF U T U R E T E C H
Page 9 and 10: DMAPP vs. uGNI (FM
Page 11 and 12: Relaxed Ordering and ConcurrencyF U
Page 13 and 14: Communication <str
Page 15 and 16: Communication Para
Page 17 and 18: Relaxed Ordering andCommuni
Page 19 and 20: UPC Shared Memory Ordering Challeng
Page 21 and 22: Cray MPI Method to ExploitGemini Re
Page 23 and 24: MPI Eager 1F U T U R E T E C H N O
Page 25 and 26: MPI Rendezvous 1F U T U R E T E C H
Page 27 and 28: 1648Bwindow size1648BF U T U R E T
Page 29 and 30: window sizwindowwindow sizewindow s
Page 31: ConclusionF U T U R E T E C H N O L

One-sided vs. Two-sided Communication Paradigms on Relaxed ...

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