1GPUs can handle thousands of concurrent threads.
2The pieces of code running on the gpu are called kernels
3A kernel is executed by a set of threads.
4All threads execute the same code (SPMD)
5Each thread has an index that is used to calculate memory addresses that this will access.
1Threads are grouped into blocks
2 Blocks are grouped into a grid
3 A kernel is executed as a grid of blocks of threads
? Built-in variables ? threadIdx, blockIdx ? blockDim, gridDim
原文：http://www.cnblogs.com/hiramlee0534/p/5931456.html