threadIdx，blockIdx, blockDim, gridDim之间的区别与联系

https://blog.csdn.net/qq_34488063/article/details/52162454 在启动kernel的时候，要通过指定gridsize和blocksize才行，举下面的例子说说： dim3 gridsize(2,2); dim3 blocksize(4,4); gridsize相当于有22个block， gridDim.x，gridDim.y，gridDim.z

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