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

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Low-Level API SummaryF U T U R E T E C H N O L O G I E S G R O U P DMAPP hides switchingcomplexity between FMA and BTE It also provides collectives Relaxed ordering improvesperformance (expected). Strict ordering hurts performanceMOSTLY under high concurrency. Registration is an expensivememory operations that better beremoved from critical path ofexecution. Performance Difference between<strong>One</strong>-<strong>sided</strong> and <strong>Two</strong> <strong>sided</strong> is NOTdue to different Performance oflow-level APIs.IOCTLGNIKernel LevelGNI (kGNI)GNI CoreFortran, CMPICH2DIRECTSHMEMHardware (Gemini/Arie)UPCDMAPPGeneric Hardware Abstraction Layer (GHAL)libpgasDIRECTLAWRENCE BERKELEY NATIONAL LABORATORY
<strong>Communication</strong> <strong>Paradigms</strong>F U T U R E T E C H N O L O G I E S G R O U P<strong>One</strong>-<strong>sided</strong> UPC<strong>Two</strong>-<strong>sided</strong> MPIP0P1P0P1LocalpromotedLocalLocal sharedLocal sharedpromotedput/get operationssend/recv operationsLAWRENCE 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 and 6: Hopper HardwareF U T U R E T E C H
Page 7 and 8: MicrobenchmarkF U T U R E T E C H N
Page 9 and 10: DMAPP vs. uGNI (FM
Page 11: Relaxed Ordering and ConcurrencyF U
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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