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Blocks must be independent ¡ Any possible interleaving of blocks should be valid § presumed to run to completion without pre-‐emption § can run in any order § can run concurrently OR sequentially ¡ Blocks may coordinate but not synchronize § shared queue pointer: OK § shared lock: BAD … can easily deadlock ¡ Independence requirement gives scalability 16/73
Scalability ¡ Manycore chips exist in a diverse set of configurations 35 Number of SMs 30 25 20 15 10 5 0 8300GS 9400M 8800GTX GTX285 ¡ CUDA allows one binary to target all these chips ¡ Thread blocks bring scalability! 17/73
Page 1: An Introduction to CUDA/OpenCL a
Page 13 and 14: What is a CUDA Thread Block?
Page 15: Synchronization ¡ Threads within
Page 19 and 20: Memory model Thread Per-‐threa
Page 24 and 25: Using per-‐block shared memo
Page 26 and 27: CUDA: Runtime support ¡Explicit
Page 28 and 29: CUDA and OpenCL correspondence
Page 30 and 31: Imperatives for Efficient CUDA
Page 32 and 33: Mapping CUDA to a GPU, continu
Page 34 and 35: Profiling NVIDIA Visual Profiler©
Page 36 and 37: Memory, Memory, Memory ! Chapter
Page 38 and 39: Coalescing ¡ GPUs and CPUs both
Page 40 and 41: SoA, AoS ¡ Different data acces
Page 42 and 43: Efficiency and Productivity" Parall
Page 44 and 45: Abstraction, cont." Reduction is on
Page 46 and 47: Diving In#include #include #include
Page 48 and 49: Containers" Concise and readable co
Page 50 and 51: Iterators" Iterators act like point
Page 52 and 53: Algorithms" Elementwise operations"
Page 54 and 55: Algorithms" Standard data types// a
Page 56 and 57: Custom Types & Operators// compare
Page 58 and 59: Recap" Containers manage memory" He
Page 60 and 61: Explicit versus implicit parallelis
Page 62 and 63: Explicit versus implicit parallelis
Page 64 and 65: Productivity Implications" Consider
Page 66 and 67:
Productivity Implications" Consider
Page 68 and 69:
Leveraging Parallel Primitives" Use
Page 70 and 71:
Leveraging Parallel Primitives" Com
Page 72 and 73:
Summary ¡ Throughput optimized p
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Slides - Par Lab

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