No Cluster Is an Island: ScaleAcross Explorer and the Geography Tax of AI Training
GPUs used to have a simple business story: buy more, wire them well, train bigger models. That story is not false. It is just starting to resemble a children’s book. The adult version has buildings, regions, power constraints, optical links, oversubscribed networks, packet loss, pipeline bubbles, model chunks, microbatches, and a quiet question with a very expensive answer: when the GPUs no longer fit comfortably inside one data center building, how should the training job be split? ...