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Walk through the ZeRO stages and FSDP internals. Where does the memory actually go and when is it gathered?

ZeRO and FSDP both shard training state across data-parallel ranks, but the magic is in when each shard is gathered and freed. Get the memory accounting and the all-gather timing and you can size any run.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

ZeRO and FSDP both shard training state across data-parallel ranks, but the magic is in when each shard is gathered and freed. Get the memory accounting and the all-gather timing and you can size any run.

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