Introduction to CUDA C
Introduction to CUDA C Introduction to CUDA C
Review (cont) � Basic device memory management — cudaMalloc() — cudaMemcpy() — cudaFree() � Launching parallel kernels — Launch N copies of add() with: add>(); — Used blockIdx.x to access block’s index
Threads � Terminology: A block can be split into parallel threads � Let’s change vector addition to use parallel threads instead of parallel blocks: __global__ void add( int *a, int *b, int *c ) { } c[ threadIdx.x blockIdx.x ] = a[ threadIdx.x blockIdx.x ] + b[ threadIdx.x blockIdx.x ]; � We use threadIdx.x instead of blockIdx.x in add() � main() will require one change as well…
- Page 1 and 2: Introduction to CUDA C San Jose Con
- Page 3 and 4: What is CUDA? � CUDA Architecture
- Page 5 and 6: CUDA C Prerequisites � You (proba
- Page 7 and 8: Hello, World! int main( void ) { pr
- Page 9 and 10: Hello, World! with Device Code __gl
- Page 11 and 12: A More Complex Example � A simple
- Page 13 and 14: Memory Management � Host and devi
- Page 15 and 16: A More Complex Example: main() int
- Page 17 and 18: Parallel Programming in CUDA C �
- Page 19 and 20: Parallel Programming in CUDA C �
- Page 21 and 22: Parallel Addition: main() #define N
- Page 23: Review � Difference between “ho
- Page 27 and 28: Parallel Addition (Threads): main()
- Page 29 and 30: Indexing Arrays With Threads And Bl
- Page 31 and 32: Addition with Threads and Blocks
- Page 33 and 34: Parallel Addition (Blocks/Threads):
- Page 35 and 36: Dot Product � Unlike vector addit
- Page 37 and 38: Dot Product � But we need to shar
- Page 39 and 40: Parallel Dot Product: dot() � We
- Page 41 and 42: Faulty Dot Product Exposed! � Ste
- Page 43 and 44: Synchronization � We need threads
- Page 45 and 46: Parallel Dot Product: dot() __globa
- Page 47 and 48: Parallel Dot Product: main() } // c
- Page 49 and 50: Review (cont) � Using __shared__
- Page 51 and 52: Multiblock Dot Product: Algorithm
- Page 53 and 54: Multiblock Dot Product: dot() #defi
- Page 55 and 56: Global Memory Contention Block 0 su
- Page 57 and 58: Atomic Operations � Terminology:
- Page 59 and 60: Parallel Dot Product: main() #defin
- Page 61 and 62: Review � Race conditions — Beha
- Page 63: Questions � First my questions
Threads<br />
� Terminology: A block can be split in<strong>to</strong> parallel threads<br />
� Let’s change vec<strong>to</strong>r addition <strong>to</strong> use parallel threads instead of parallel blocks:<br />
__global__ void add( int *a, int *b, int *c ) {<br />
}<br />
c[ threadIdx.x blockIdx.x ] = a[ threadIdx.x blockIdx.x ] + b[ threadIdx.x<br />
blockIdx.x<br />
];<br />
� We use threadIdx.x instead of blockIdx.x in add()<br />
� main() will require one change as well…
Change language