PGAS Programming with UPC and Fortran Coarrays

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12/19/2012TS: Atomic variables• Fortran already includes some atomic support (define,ref)• TS expands on this to supports atomic compare and swap,fetch and add, …integer (atomic_int_kind) :: counter[*]call atomic_define(counter[1],0)call atomic_add(counter[1],1)call atomic_ref(countval,counter[1])2513
12/19/2012Experiences withCoarraysParallel Programming with Fortran CoarraysMSc in HPCDavid Henty, Alan Simpson (EPCC)Harvey Richardson, Bill Long (CrayOverview• Implementations• Performance considerations• Where to use the coarray model• Coarray benchmark suite• Examples of coarrays in practice• References• Wrapup21
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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
Page 69 and 70: 12/19/2012Fortran coarraysBasic Fea
Page 71 and 72: 12/19/2012What are coarrays?• Arr
Page 73 and 74: 12/19/2012Making remote references
Page 75 and 76: 12/19/2012Synchronisation• code e
Page 77 and 78: 12/19/2012Example2: Calculate densi
Page 79 and 80: 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: 12/19/2012TS: Collective intrinsic
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 and 132: 12/19/2012Coarray Benchmark Suite
Page 133 and 134: microseconds12/19/2012Pingpong (sma
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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