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• Global Memory can fetch up to 128 bytes in asingle transaction• If all threads of a half-warp access elements in 128byte segment at the same time – then bandwidthimproves• Unlikely to happen with irregular memoryapplications• What’s the effect of un-coalesced memoryaccesses?
Memory Transactions128-byte segmentsThreadsThread 1Thread 2Thread 3Segment 1 Segment 2 Segment 3GLOBAL MEMORYThread 14Thread 15Thread 16Segment n-2 Segment n-1 Segment nMemory Transactions
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• Dedicated co-processorsthat han
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• Classic Irregular Algorithm•
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• Pointer Jumping Technique for t
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Thread Execution Control Unit1 2 M-
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CPU / HostKernel 1GridBlocks(0,0)GP
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• Simple Problem (Sequentially Sp
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• A basic technique in parallel c
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• A basic technique in parallel c
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• Use pointer jumping repeatedly
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100001000Time (Milliseconds)1001010
Page 26: • The original algorithm has n th
Page 29 and 30: 40961024256Time (Milliseconds)64164
Page 31 and 32: • Designed for SMPs - Sparse Ruli
Page 33 and 34: SuccessorArrayLocal Ranks2 4 8 1 9
Page 51 and 52: • Assume you select n/log n split
Page 55 and 56: • Each phase is coded as separate
Page 57 and 58: • Notice that choosing splitters
Page 59 and 60: • Two factors that contribute to
Page 61 and 62: • Ordered Lists are Lists with su
Page 64 and 65: • Parallel Processing of Graphs
Page 66 and 67: Each edge is replaced with a set of
Page 68 and 69: • Once an Euler Path is construct
Page 70 and 71: Load TreeConstruct Euler Path EPPer
Page 72: 120.00160.00100.00140.00Time (Milli
Page 75: • Kernel Cycles consists of• Da
Page 80 and 81: • Calculations
Page 82 and 83: • Exploiting massive parallelism
Page 84: • 2007 - 2008 Course Work at IIIT
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