PGAS Programming with UPC and Fortran Coarrays

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andwidth (MB/s)12/19/2012Platforms• Limited compiler support at present• results presented from Cray systems• Cray Compiler Environment (CCE) 7.4.1• Cray XT6MPP with dual 12-core Opteron Magny-Cours nodes and CraySeastar2+ torus interconnect.Coarrays implemented using GASNET.• Cray XE6Same nodes as XT6 but with Gemini torus interconnect which supportRDMA23Pingpong80006000XE6 putXT6 putXT6 MPIXE6 MPIPoint-to-point comms4000200001 10 100 1000 10000 100000 1000000 10000000message length (doubles)2412
microseconds12/19/2012Pingpong (small message regime)80XE6 putXT6 putXE6 MPI60XT6 MPIPoint-to-point commsmicroseconds402001 4 16 64 256 1024 4096message length (doubles)sync images put latency MPI latencyXT6 33.1 45.3 7.4XE6 3.0 3.7 1.625Global Synchronisation3000sync allMPI Barrier * 100XT6 Synchronisation20001000016 32 64 128 256 512 1024 2048images• XT coarray implementation not keeping up with MPI2613
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PGAS Programming withUPC and Fortra
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•19/12/2012Contents• A Little B
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•19/12/2012Vectorisation• Somet
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•19/12/2012Contents• A Little B
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•19/12/2012Shared Memory• Multi
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•19/12/2012Single-Sided Communica
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•19/12/2012PGAS Languages• The
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•19/12/2012Hybrid Approaches• U
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•19/12/2012References• PRACE-PP
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UPCUnified Parallel CParallel exten
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Private vs. shared memory spaceConc
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Shared array distributionIf a share
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Example: vector addition (1)#define
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“Static” keywordensures shared
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References• UPC Language Specific
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Sample PBS script for XE6#!/bin/bas
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Brief recap… private and shared d
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Multi-dimensional dataUPC can distr
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Multi-dimensional data - Case 1shar
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Multi-dimensional data - Case 3slab
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Static vs. dynamic compilation (3)s
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Debugging barriersthe optional valu
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Example: Vector addition (3/3)Advan
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Improved data distributionCAB00 0 0
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C pointersA pointer in C is a data
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UPC pointersUPC pointers have three
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Pointer castingcasting a shared poi
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Non-collective dynamic allocation (
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Creating locksinitial state of a ne
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Example: Dining Philosophers (contd
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Broadcastshared[] int A[2];shared[2
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Final summarydata distribution & wo
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12/19/2012The FortranProgramming Mo
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12/19/2012Fortran 2008 coarray mode
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12/19/2012Fortran coarraysBasic Fea
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12/19/2012What are coarrays?• Arr
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12/19/2012Making remote references
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12/19/2012Synchronisation• code e
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12/19/2012Example2: Calculate densi
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12/19/2012Exercise Session 1• Loo
Page 81 and 82: 12/19/2012OpenMP implementationmemo
Page 83 and 84: 12/19/2012MPIprocess 0memoryprocess
Page 85 and 86: 12/19/2012High Performance Fortran
Page 87 and 88: 12/19/2012UPCthreadthreadthreadmemo
Page 89 and 90: 12/19/2012Fortran coarray modelproc
Page 91 and 92: 12/19/2012Parallel Programmingwith
Page 93 and 94: 12/19/2012Edge detection and pictur
Page 95 and 96: 12/19/2012More Coarray FeaturesPara
Page 97 and 98: 12/19/20122D Data• However, image
Page 99 and 100: 12/19/2012Codimensions: What They M
Page 101 and 102: 12/19/2012this_image() & image_inde
Page 103 and 104: 12/19/2012Allocatable Coarrays• C
Page 105 and 106: 12/19/2012Coarrays and Procedures
Page 107 and 108: 12/19/2012Summary• Coarrays with
Page 109 and 110: segmentsegment12/19/2012More on Syn
Page 111 and 112: 12/19/2012Synchronisation mistakes
Page 113 and 114: 12/19/2012Other Synchronisation•
Page 115 and 116: 12/19/2012More on Cosubscripts• i
Page 117 and 118: 12/19/2012Coarray Technical Specifi
Page 119 and 120: 12/19/2012TS: Collective intrinsic
Page 121 and 122: 12/19/2012Experiences withCoarraysP
Page 123 and 124: 12/19/2012Implementations we have u
Page 125 and 126: 12/19/2012Adding coarrays to existi
Page 127 and 128: 12/19/2012AllReduce (everyone gets,
Page 129 and 130: 12/19/2012Synchronisation (one to m
Page 131: 12/19/2012Coarray Benchmark Suite
Page 135 and 136: 12/19/20123D Halo Swap on XE6 (weak
Page 137 and 138: 12/19/2012Data Structuresuse,intrin
Page 139 and 140: 12/19/2012Solve the puzzles and wri
Page 141 and 142: 12/19/2012Distributed remote gather
Page 143 and 144: Performance (TFlop/s)12/19/2012HIME
Page 145 and 146: 12/19/2012References• http://lacs
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