xla

The roofline, the sharding arithmetic and the parallelism trade-offs transfer unchanged, and the numbers are in the same units. What changes is who writes the kernels, how shapes must behave, and the interconnect topology you shard against. The v6e and v7 numbers worked through against an H100.

On a TPU pod you write one program, annotate how each array is sharded across a named mesh, and the compiler inserts and schedules every collective. What that removes from the engineer's job, what the torus changes about layouts, where Pathways fits, and what a compiler-owned schedule costs.