Supercomputers could be measured in a number of methods, however the important statistic is their skill to carry out floating-point operations per second, or flops. Flopping as quick as potential is what makes you profitable. At her peak, Sierra may hit 94.64 petaflops—94.64 quadrillion floating-point operations—per second. El Capitan, at 1.809 exaflops, is about 19 occasions quicker. In late 2025, he was formally declared the world’s quickest supercomputer. Sierra’s juice, Neely says, was now not well worth the squeeze.
There was no huge purple button, no big lever, that turned Sierra off. Somebody may’ve simply lower the cords, certain, however that’s not the beneficial process. First, Sierra’s person scientists have been warned, by way of electronic mail, to avoid wasting their work. Then a DNR was formally instituted—no new components.
The decommissioning proceeded in phases, beginning with the compute nodes and the rack switches—administration nodes are final, since they’re wanted till the very finish. The method entails working scripts that, digitally, shut the pc down, after which onerous energy switches are flipped off too. There’s additionally a dehydration. When she was alive, Sierra may get fairly scorching, so the lab recirculated hundreds of gallons of water per minute, funneled via veiny pipes that got here up from beneath her floorboards. As she approached demise, that water needed to be drained. It was examined by security employees first, to make sure it was an environmentally wholesome pH.
