[smokel]

> P.s. how much is an exaflop or petaflop

1 petaflop = 10^15 flops = 1,000,000,000,000,000 flops.

1 exaflop = 10^18 flops = 1,000,000,000,000,000,000 flops.

Note that these are simply powers of 10, not powers of 2, which are used for storage for example.