PGAS Programming with UPC and Fortran Coarrays

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Dynamic memory allocation (2)two types of memory allocation functionso non-collective: upc_global_alloc, upc_alloco collective: upc_all_alloccollective calls are called by all threads and return the same address value(pointer) to all of themnon-collective calls can be executed by multiple threads. Each call will allocate adifferent shared block.free the allocated memory using upc_freeo not a collective callUPC 13Non-collective dynamic allocationeach thread allocates a memory block in its own shared memory spaceshared [] int *ptr;ptr = (shared [] int *) upc_alloc(N*sizeof(int));NNNShared Memory SpacePrivate Memory Spacep1p1p1UPC 14–7
Non-collective dynamic allocation (2)shared [N] int *ptr;ptr = (shared [N] int *) upc_global_alloc(THREADS, N*sizeof(int));N N NN N NNNNShared Memory SpacePrivate Memory Spacep1p1p1UPC 15Collective dynamic allocationallocate contiguous segments of shared memoryshared [N] int *ptr;ptr = (shared [N] int *)upc_all_alloc(THREADS, N*sizeof(int));NNNShared Memory SpacePrivate Memory Spacep1p1p1UPC 16–8
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PGAS Programming withUPC and Fortra
Page 3 and 4: •19/12/2012Contents• A Little B
Page 5 and 6: •19/12/2012Vectorisation• Somet
Page 7 and 8: •19/12/2012Contents• A Little B
Page 9 and 10: •19/12/2012Shared Memory• Multi
Page 11 and 12: •19/12/2012Single-Sided Communica
Page 13 and 14: •19/12/2012PGAS Languages• The
Page 15 and 16: •19/12/2012Hybrid Approaches• U
Page 17 and 18: •19/12/2012References• PRACE-PP
Page 19 and 20: UPCUnified Parallel CParallel exten
Page 21 and 22: Private vs. shared memory spaceConc
Page 23 and 24: Shared array distributionIf a share
Page 25 and 26: Example: vector addition (1)#define
Page 27 and 28: “Static” keywordensures shared
Page 29 and 30: References• UPC Language Specific
Page 31 and 32: Sample PBS script for XE6#!/bin/bas
Page 33 and 34: Brief recap… private and shared d
Page 35 and 36: Multi-dimensional dataUPC can distr
Page 37 and 38: Multi-dimensional data - Case 1shar
Page 39 and 40: Multi-dimensional data - Case 3slab
Page 41 and 42: Static vs. dynamic compilation (3)s
Page 43 and 44: Debugging barriersthe optional valu
Page 45 and 46: Example: Vector addition (3/3)Advan
Page 47 and 48: Improved data distributionCAB00 0 0
Page 49 and 50: C pointersA pointer in C is a data
Page 51 and 52: UPC pointersUPC pointers have three
Page 53: Pointer castingcasting a shared poi
Page 57 and 58: Creating locksinitial state of a ne
Page 59 and 60: Example: Dining Philosophers (contd
Page 61 and 62: Broadcastshared[] int A[2];shared[2
Page 63 and 64: Final summarydata distribution & wo
Page 65 and 66: 12/19/2012The FortranProgramming Mo
Page 67 and 68: 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
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segmentsegment12/19/2012More on Syn
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12/19/2012Synchronisation mistakes
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12/19/2012Other Synchronisation•
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12/19/2012More on Cosubscripts• i
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12/19/2012Coarray Technical Specifi
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12/19/2012TS: Collective intrinsic
Page 121 and 122:
12/19/2012Experiences withCoarraysP
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12/19/2012Implementations we have u
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12/19/2012Adding coarrays to existi
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12/19/2012AllReduce (everyone gets,
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12/19/2012Synchronisation (one to m
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12/19/2012Coarray Benchmark Suite
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microseconds12/19/2012Pingpong (sma
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12/19/20123D Halo Swap on XE6 (weak
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12/19/2012Data Structuresuse,intrin
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12/19/2012Solve the puzzles and wri
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12/19/2012Distributed remote gather
Page 143 and 144:
Performance (TFlop/s)12/19/2012HIME
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12/19/2012References• http://lacs
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PGAS Programming with UPC and Fortran Coarrays

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