Blackwell Thread Hierarchy

click a level — thread → warp → warpgroup → CTA → cluster → grid

GRID — one kernel launch

CLUSTER — CTAs across SMs (DSMEM)

CTA — thread block · one SM

WARPGROUP — 4 warps · 128 threads

WARP — 32 threads (SIMT)

warp 1

warp 2

warp 3

CTA 1
…