cuda - Which threads in a block form a warp? -



cuda - Which threads in a block form a warp? -

in 2-d or 3-d cuda block, how threads grouped warps? assumption iterate first x, y, z. example, in threads <z,y,x>, <0,0,[0-31]> warp, , <0,1,[0-31]>, etc. correct?

yes correct. threads grouped first x, y, z (thread coordinates) when creating warps (groups of 32 threads execute together). has implications coalescing: want arrange usage of thread coordinates in matrix subscripts warp-adjacent threads (i.e. in x coordinates, typically) access adjacent elements in matrix (by using threadidx.x or derivative in rapidly varying matrix dimension. typically want data[z][y][x], not data[x][y][z]

cuda gpu

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