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Multi-Node Setup

One machine or fifty — the code is the same; only the wiring between them changes.

Key Insight​

A multi-node job spreads training across more than one node (machine), each with its own GPUs, connected over a network. DDP behaves the same across nodes as within one — the new challenge is the network setup and making every process find the others.

Why This Matters​

Real large-scale training rarely fits on a single machine. Getting a job to cross node boundaries even once teaches you the networking and launch details that every big training run depends on.