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，grid...
