Is that unit PetaFLOPS/day right? I think it should be PetaFLOPS-day which has dimensions of FLOP (total number of operations), rather than FLOP/time^2. The co

Is that unit PetaFLOPS/day right? I think it should be PetaFLOPS-day which has dimensions of FLOP (total number of operations), rather than FLOP/time^2. The cost wouldn't be the cost of the hardware because it still exists afterwards. You'd have to discount it for the amount of time it was in use.